"Abbott","Pennsylvanian,Lower-Pennsylvanian,Middle","Illinois basin","IL","+Abbott Formation","(Rocks of +Abbott Formation (IL*) reallocated to Tradewater Formation of Raccoon Creek Group.  See Tradewater."
"Abernathy Dolomite","Ordovician,Middle","Ozark uplift,Illinois basin","IL,KY,MO","Joachim Dolomite",""
"Abo","Permian,Lower","San Juan basin,Orogrande basin,Estancia basin,Palo Duro basin","NM",
"Abrigo","Cambrian,Middle- Cambrian,Upper","Pedregosa basin,Basin and Range province","AZ",""
"Adams Branch Limestone","Pennsylvanian,Upper","Bend arch","TX","Graford Formation of Canyon Group",""
"Addy Quartzite","Cambrian,Upper","Northern Cascade Range-Okanagan province","ID,WA"
"Admiral","Permian,Lower","Bend arch","ok,TX","Wichita Group",""
"Aguajito Shale","Miocene","Coastal basins","CA","Monterey Formation",""
"Aguja","Cretaceous,Upper","Permian basin","TX",""
"Akron Dolomite","Silurian,Upper","Appalachian basin","PA,NY","Bertie"
"Alachua","Pliocene","South Georgia sedimentary province,Florida platform","FL",""
"Albany Clay","Pleistocene","Appalachian basin,New England province","NY,VT","(+Albany Clay (NY,VT), also informally called +Lake Albany clays, considered abandoned?  Uncertain if still in use by the NY and VT Geol. Surveys.  Not used by the USGS.","
"Albert","Devonian,Upper-Mississippian","New Bunswick","NB",,"1300m of grey Lustrine marls"
"Alberta Group","Cretaceous","Central Alberta","AB",,"Shales and Sandstones=Montanan,Coloradan"
"Aldrich Mountains","Triassic,Upper-Jurassic,Lower","Blue Mountains province","OR",
"Alexo","Devonian","Brazeau Range adjacent to North Saskatchewan river gap","AB","100-200m of Silty carbonates above the Southesk-Mt Hawk formation and below the Pallisier formation"
"Allamoore Limestone","Precambrian","Southwestern Basin and Range region","TX",""
"Allegheny","Pennsylvanian,Middle","Appalachian basin","MD,OH,PA,VA,WV"
"Allenby (Canada)","Eocene",,"BC"
"Allenby Coal","Pennsylvanian,Middle","Illinois basin","IL","Carbondale Formation",""
"Allentown Limestone","Cambrian,Upper- Ordovician,Lower(?)","Appalachian basin","NJ,PA","Kittatinny Limestone",""
"Almy","Eocene","Green River basin,Uinta uplift,Wasatch uplift","UT,WY","Wasatch Group",""
"Alpena Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Alsea","Eocene,Upper-Oligocene","Oregon-Washington Coast Ranges province","OR"
"Altamont Limestone","Pennsylvanian,Middle","Chautauqua platform,Cherokee basin,Forest City basin,Lincoln anticline","IA,KS,MO,OK","Marmaton Group",""
"Altyn","Precambrian- Proterozoic,Middle","Northern Rocky Mountain region","MT","Belt Supergroup",""
"Alum Bluff","Miocene, early- Miocene, middle","South Georgia sedimentary province,Mid-Gulf Coast basin,Florida platform","AL,FL,GA",""
"Amabel","Silurian","Niagara escarpment in Hamilton region","ON",,"White weathering dolomites above Fossil Hill formation"
"American Creek","","Alaska West-Central region","AK",""
"American Falls","Pleistocene, late","Snake River basin","ID",""
"Americus Limestone","Permian,Lower- Pennsylvanian,Upper","Forest City basin,Nemaha anticline","KS,NE,OK","Foraker Limestone of Council Grove Group",""
"American Tickle","Ordovician","Newfoundland Northern Peninsula","NL","Goose Tickle Group"
"Ames Knob","Silurian,Lower- Silurian,Upper- Devonian,Lower","New England province","ME",""
"Ames Limestone","Pennsylvanian,Upper","Appalachian basin","KY,MD,OH,PA,WV","Conemaugh Formation",""
"Amsden","Mississippian,Upper (local)- Pennsylvanian,Lower- Pennsylvanian,Middle","Idaho Mountains province,Green River basin,Wind River basin,Yellowstone province,Powder River basin,Montana folded belt province,Big Horn basin,Central Montana uplift","ID,MT,ND,WY",""
"Anachacho Limestone","Cretaceous, Upper","Balcones Escarpment","TX"
"Anderson Coal","Paleocene- Paleocene","Piceance basin,Powder River basin","MT,WY","",""
"Animas","Cretaceous,Upper- Paleocene- Paleocene","San Juan basin","CO,NM",""
"Annona Chalk","Cretaceous,Upper","Ouachita folded belt,Arkla basin","AR,LA,MS,OK,TX",""
"Anse Maranda","Cambrian,Lower","St Lawrence Valley","QC"
"Antelope Valley Limestone","Ordovician,Lower- Ordovician,Middle","Great Basin province","CA,NV","Pogonip Group",""
"Antes Shale","Ordovician,Middle- Ordovician,Upper","Appalachian basin","MD,PA,WV",""
"Antietam","Cambrian,Lower","Appalachian basin","MD,PA,VA,WV","Chilhowee Group",""
"Aquia","Paleocene- Paleocene","Atlantic Coast basin","DC,DE,MD,VA",""
"Arapien Shale","Jurassic,Middle","Wasatch uplift,Great Basin province,Uinta basin","UT",""
"Ardath Shale","Eocene, middle","Peninsular Ranges province","CA","La Jolla Group",""
"Arickaree Shale","Cretaceous,Upper","Las Animas arch","KS,NE","Pierre Shale","(+Arickaree Shale of Pierre Shale (KS) abandoned.","
"Arikareean Shale","Devonian,Middle","Michigan basin","MI,OH","western NE","(Wood and others, 1941).
"Arkadelphia Marl","Cretaceous,Upper","Ouachita folded belt,Anadarko basin,Arkla basin","AR,LA,TX","Navarro Group"
"Arkona Shale","Devonian,Middle","Michigan basin","MI,OH,on",""
"Arnheim","Ordovician,Upper","Cincinnati arch","OH,TN",""
"Arroyo Penasco","Mississippian,Lower- Mississippian,Upper","San Juan basin,San Luis basin,Estancia basin,Palo Duro basin,Sierra Grande uplift,Las Vegas-Raton basin","NM",""
"Arroyo","Permian,Lower","Bend arch","TX","Clear Fork Group",""
"Arundel Clay","Cretaceous,Lower","Atlantic Coast basin","DC,MD","Potomac Group",""
"Asbill Pond","Cambrian","Piedmont-Blue Ridge province","SC",""
"Ash Hollow","Miocene","Denver basin,Powder River basin,Anadarko basin,Salina basin,Central Kansas uplift,Sioux uplift","CO,KS,NE,SD,WY","Ogallala Group",""
"Ashern","Silurian,Upper- Devonian,Lower- Devonian,Middle","Williston basin","mb,MT,ND","Elk Point Group",""
"Asheville","Cretaceous","Manitoba","MB,sk",,"Equivalent to Lower Alberta Group-Shales and Sandstones above the Swan River Group and below the Favel Formation"
"Ashland Limestone","Devonian","Lincoln Anticline,Ozark uplift","MO",""
"Aspinwall Limestone Shale","Permian,Lower","Cherokee basin,Forest City basin","KS,NE,OK","Onaga Shale of Admire Group",""
"Astoria","Miocene, early- Miocene, middle","Oregon-Washington Coast Ranges province","OR,WA",""
"Athens Limestone","Ordovician,Middle","Appalachian basin","AL,GA,TN,VA",""
"Atoka","Pennsylvanian,Middle","Arkoma basin,Ouachita folded belt,Chautauqua platform","AR,CO?,KS?,MO?,NE?,OK,TX?",""
"Au Train","Ordovician,Lower- Ordovician,Middle","Michigan basin","MI",""
"Auburn (NE) Shale","Pennsylvanian,Upper","Forest city basin","IA,KS,MO,NE,OK"
"Auburn","","Piedmont-Blue Ridge province","AL,GA","Opelika Complex",""
"Austin","Cretaceous,Upper","Ouachita folded belt,South Oklahoma folded belt,Gulf Coast basin,Permian basin,Fort Worth syncline,East Texas basin","AR,FL?,LA,TX",""
"Avis Limestone","Mississippian,Upper","Appalachian basin","WV","Hinton group"
"Avoca Limestone","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE","Lecompton Limestone of Shawnee Group",""
"Aycross","Eocene, middle","Wind River basin,Big Horn basin","WY",""
"Aztec Sandstone","Triassic(?)- Jurassic,Lower","Great Basin province","AZ?,CA,NV",""
"Badger Flat Limestone","Ordovician,Middle","Great Basin province","CA","Mazourka Group",""
"Bailey","Silurian,Upper- Devonian,Lower","Illinois basin,Upper Mississippi embayment","IL,IN,KY,MO",""
"Bald Mountain Limestone","Ordovician,Lower- Ordovician,Middle","New England province","NY,VT",""
"Bandera Shale","Pennsylvanian,Middle","Forest City basin,Cherokee basin","IA,KS,MO,OK","Marmaton Group",""
"Banff","Mississippian","Chadron arch,Williston basin,Powder River basin,Montana folded belt province","AB,MT,ND?,SD?,WY?",""
"Bangor Limestone","Mississippian,Upper","Appalachian basin","AL,GA,KY,MS,TN",""
"Barnett","Pennsylvanian,Middle","Anadarko basin","OK,tx",""
"Barnwell","Eocene, late","Atlantic Coast basin,South Georgia sedimentary province","GA,SC",""
"Barre","Devonian,Upper","New England province","VT",""
"Barstow","Miocene, middle- Miocene, late","Mojave basin","az,CA",""
"Bashi","Eocene, early","Mid-Gulf Coast basin,South Georgia sedimentary province","AL,FL,GA,MS","Wilcox Group",""
"Bastendorf Shale","Oligocene-Eocene","Western Columbia basin","OR"
"Bat Cave","Ordovician","Orogrande basin","NM","El Paso Group",""
"Bateman","Eocene,Middle-Eocene,Upper","Oregon-Washington Coast Ranges province","OR"
"Batesland","Miocene","Sioux uplift,Chadron arch","SD",""
"Batesville (MO)","Mississippian,Upper","Arkoma basin","AR,KS,MO,OK"
"Batesville Shale","Ordovician,Upper","Arkoma basin","AR","+Batesville ash bed","(Rocks of +Batesville ash bed (informal) (AR) reallocated to Cason Shale.  See Cason.","
"Battle (Canada)","Cretaceous,Upper",,"AB"
"Battle","Pennsylvanian,Middle","Great Basin province","NV",""
"Bautista","Pleistocene- Pliocene","Peninsular Ranges province","CA",""
"Baxter Shale","Cretaceous,Upper","Green River basin","WY",""
"Bay Point","Pleistocene, late","Peninsular Ranges province","CA",""
"Bear Bluff Limestone","Pliocene, late","Atlantic Coast basin","NC,SC","(+Bear Bluff Formation (SC*,NC*) is same as upper Goose Creek Limestone.  See Goose Creek.","
"Bear Gulch","Pennsylvanian,Lower","Central Montana uplift,Powder River basin,Williston basin","MT,ND","Tyler Formation",""
"Bear River","Jurassic(?)","Alaska Southeastern region","AK","(+Bear River Formation (AK) replaced with Hazelton Group.  See Hazelton.","
"Bear River (WY)","Cretaceous",,"wy"
"Bear Rock","Devonian,Lower","Anderson River area","NT"
"Bear","Paleocene- Paleocene","Central Montana uplift","MT",""
"Bearpaw Shale","Cretaceous,Upper","Powder River basin,Central Montana uplift,Williston basin,Big Horn basin,Montana folded belt province,Sweetgrass arch","AB,MT,sd,sk,WY","Montana Group",""
"Beartooth Butte","Devonian,Lower","Big Horn basin,Montana folded belt province,Central Montana uplift,Powder River basin,Yellowstone province,Snake River basin","ID,MT,WY",""
"Beaufort","Paleocene- Paleocene","Atlantic Coast basin","NC,SC",""
"Beaverfoot-Brisco Limestone","Ordovician,Middle-Silurian",,"AB,BC"
"Beck Pond Limestone","Devonian,Lower","New England province","ME",""
"Beck Springs Dolomite","Precmbrian","Great Basin province","CA",,"
"Becraft Limestone","Devonian,Lower","Appalachian basin,New England province","MD,NJ,NY,PA,VA","Helderberg Group",""
"Bedford Canyon","Triassic- Jurassic,Middle- Cretaceous,Lower(?)","Peninsular Ranges province","CA",""
"Bedford Coal","Pennsylvanian","not stated","IA,in,MO,OH","",""
"Bedford (QC)",,,"qc"
"Beebe Limestone","Cambrian,Lower","New England province","NY,VT","Bull Formation",""
"Beech Creek Limestone","Mississippian,Upper","Illinois basin","IL,IN,KY,MO","Golconda Formation",""
"Beech River","Silurian- Silurian, middle","Cincinnati arch","TN","Brownsport Group",""
"Beekmantown Dolomite","Cambrian,Upper- Ordovician,Lower- Ordovician,Middle","New England province,Appalachian basin","MD,NJ,NY,OH,PA,qc,VA,VT,WV",""
"Begg","Triassic,Upper","Snake River basin","OR","Begg Member of Vester Formation"
"Beil Limestone","Pennsylvanian,Upper","Forest City basin,Nemaha anticline","IA,KS,MO,NE,OK","Lecompton Limestone of Shawnee Group",""
"Belgrade","Oligocene, late- Miocene, early","Atlantic Coast basin","NC",""
"Bell Shale","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Belle Plains","Permian,Lower","Bend arch","TX","Wichita Group",""
"Bellevue Limestone","Ordovician,Upper","Cincinnati arch","IN,KY,OH",""
"Belly River","Cretaceous,Upper","Central Alberta,Northern Alberta, Western Sakatchwan","AB,SK"
"Belt","Precambrian- Proterozoic,Middle","Northern Rocky Mountain region","ID,MT,WA",""
"Belvidere Shale","Cretaceous,Lower","not stated","KS","","(+Belvidere Shale or +Belvidere Formation (KS) considered abandoned?  Uncertain if still in use by the KS Geol. Survey.  Abandoned by the USGS.  Considered synonym of Kiowa Shale.  See Kiowa.","
"Benson","Devonian,Upper","Applachian Basin","WV"
"Benson","Cretaceous,Upper","Vancouver Is","BC"
"Benton Shale","Cretaceous,Upper","Sweetgrass arch,North Park basin,Denver basin,Green River basin,South Park basin,Wind River basin,Powder River basin","CO,ks,MN,MT,ND,NE,NM,SD,WY",""
"Benwood Limestone","Pennsylvanian,Upper","Appalachian basin","OH,PA,WV",""
"Berea Sandstone","Devonian,Upper- Mississippian,Lower","Appalachian basin","KY,MI,OH,PA,VA,WV",""
"Bernard","Cretaceous,Upper","Blue Mountains province","OR"
"Bertie Dolomite","Silurian,Upper","Appalachian basin","NY,on,PA","Bass Islands Group",""
"Bethany Falls Limestone","Pennsylvanian,Upper","Forest City basin,Salina basin,Central Kansas uplift","IA,KS,MO,NE","Swope Limestone of Kansas City Group",""
"Bethel","Mississippian,Upper","Illinois basin,Ozark uplift","IL,IN,KY,MO","West Baden Group",""
"Bethel (CT)","Pleistocene","New England Province","CT"
"Bidahochi","Miocene- Pliocene","Black Mesa basin,San Juan basin","AZ,NM",""
"Big Blue","Miocene","San Joaquin basin","CA",""
"Big Blue (KS)","Permian","Sedgwick basin,Forest City basin,Nemaha anticline","KS,NE"
"Big Decipher Chalk","Cretaceous,Upper","Ouachita folded belt","AR","",""
"Big Hill Limestone","Ordovician,Upper","Michigan basin","MI",""
"Big Sandy","Pliocene- Miocene, late","Plateau sedimentary province","AZ",""
"Big Springs","Ordovician,Lower","Appalachian basin","NJ","Epler Formation",""
"Big Springs (KS)","Pennsylvanian,Upper","Forest City Basin","IA,KS,MO,NE"
"Bigby Limestone","Ordovician,Middle","Cincinnati arch","TN","Nashville Group",""
"Billings Shale","Ordovician,Upper","Ottawa Embayment","ON"
"Bills Creek","Ordovician Upper","Michigan Basin","MI"
"Bills Creek (OK)","Pennsylvanian","not stated","OK",""
"Bills Creek (AK)","Precambrian(?)","Alaska East-Central region","AK",""
"Birch Creek Limestone","Pennsylvanian,Upper",,"OK"
"Bird Fiord","Devonian,Middle","Arctic Canada","NT?,NU"
"Bird Spring","Pennsylvanian- Permian,Lower","Plateau sedimentary province,Great Basin province,Mojave basin","AZ,CA,NV,UT",""
"Bird","Precambrian- Proterozoic,Lower","Lake Superior region,Wisconsin arch","MI","Hemlock Formation of Baraga Group of Marquette Range Supergroup",""
"Birdsong Shale","Devonian,Lower","Cincinnati arch","TN","Linden Group",""
"Bisher","Silurian, middle","Cincinnati arch","KY,OH",""
"Black Creek (Alabama)","Pennsylvanian","Black Creek Coal Seam in Warrier Basin","AL"
"Black Creek","Cretaceous,Upper","Atlantic Coast basin","NC,SC",""
"Black Mingo","Paleocene- Paleocene- Eocene, early","Atlantic Coast basin","NC,SC",""
"Black Mountain","Permian","Cascades province","WA","Chilliwack Group",""
"Black River","Ordovician,Middle","Appalachian basin","IL,IN,MI,NY,OH,on,PA,VA,VT,WV",""
"Black Rock Limestone","Precambrian","Northern Rocky Mountain region","ID","(+Black Rock Limestone (ID) renamed +Blackrock Limestone to conform with spelling on Pocatello topographic map (where type locality is).  Later, +Blackrock (preoccupied) renamed Blackrock Canyon.  See Blackrock Canyon.","
"Blackhawk","Cretaceous,Upper","Paradox basin,Uinta basin","UT","Mesaverde Group",""
"Blackstone (Canada)","Cretaceous,Upper",,"AB"
"Blackstone","Precambrian- Proterozoic,Upper","New England province","MA,RI",""
"Blair","Cretaceous,Upper","Green River basin","WY","Mesaverde Group",""
"Blairmore Sand","Cretaceous",,"AB"
"Blairmore (TN)","Paleocene",,"tn"
"Blancan","Pliocene","North America","tx","Mammalian faunal stage after Hemphill and before Irvington.  Type Locality is Crawfish Draw, Crosby Co, Panhandle of TX"
"Blanchester","Ordovician Upper","Cincinnati arch","OH","Blanchester Member of Waynesville Formation"
"Blanco Sandstone","Silurian","Ouachita folded belt","AR,OK",
"Blanco (TX)","Pliocene-Pleistocene",,"tx"
"Blaylock Sandstone","Silurian","Ouachita folded belt","AR,OK" 
"Bliss Sandstone","Cambrian,Upper- Ordovician,Lower","Basin and Range province,Orogrande basin,Pedregosa basin","AZ?,NM,TX",""
"Blood Reserve","Cretaceous,Upper","Sweetgrass arch,SW Alberta","AB,MT",""
"Bloomfield Limestone","Pennsylvanian","Appalachian basin","OH","",""
"Bloomington","Cambrian,Middle","Wasatch uplift,Snake River basin,Great Basin province","ID,UT"
"Bloomsburg Shale","Silurian,Upper","Appalachian basin","MD,NJ,NY,PA,VA,WV","Cayuga Group"
"Blowing Rock","Precambrian- Proterozoic,Middle","Piedmont-Blue Ridge province","NC","Elk Park Plutonic Suite",""
"Blow Me Down Brook","Cambrian,Lower","Western Newfoundland(Humber Arm)","NL"
"Bloyd","Pennsylvanian,Lower- Pennsylvanian,Middle","Arkoma basin","AR,OK",""
"Blue Creek Coal","Pennsylvanian,Lower","Illinois Basin","il,IN"
"Blue Hill","Ordovician,Upper- Silurian,Lower","New England province","MA",""
"Blue Limestone","Mississippian,Lower","Eagle basin","CO","(+Blue Limestone is same as Leadville Limestone.  See Leadville.","
"Blufftown","Cretaceous,Upper","South Georgia sedimentary province,Mid-Gulf Coast basin","AL,GA","Selma Group",""
"Bob Limestone","Silurian- Silurian, middle","Cincinnati arch","KY,TN","Brownsport Group",""
"Bobcaygeon","Ordovician,Middle","Appalachian basin","on,PA",""
"Boggy","Pennsylvanian,Middle","Arkoma basin,Chautauqua platform","AR,OK","Krebs Group",""
"Boat Harbour","Orodvician,Lower","Western Newfoundland","NL"
"Bois Blanc","Devonian,Lower","Michigan basin","MI,NY,OH,on,PA",""
"Bonanza King Dolomite","Cambrian,Upper- Cambrian,Middle","Mojave basin","AZ,CA,NV,UT",""
"Bond","Pennsylvanian,Upper","Illinois basin","IL,IN","McLeansboro Group",""
"Bone Basin","Oligocene, early","Montana folded belt province","MT","Renova Formation of Bozeman Group",""
"Bone Spring Limestone","Permian, Lower","Permian Basin","NM,TX"
"Bone Valley","Miocene- Pliocene","Florida platform","FL",""
"Bonner Springs Shale","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Kansas City Group",""
"Bonneterre Dolomite","Cambrian,Upper","Ozark uplift,Illinois basin,Upper Mississippi embayment,Anadarko basin,Sedgwick basin,Sioux uplift,Chautauqua platform,Cherokee basin,Forest City basin,Las Animas arch,Central Kansas uplift,Nemaha anticline,Salina basin,Lincoln anticline","AR,CO,IL,KS (subsurface),MN,MO,NE,OK",""
"Bony Falls","Ordovician,Middle","Michigan basin","MI","Black River Formation",""
"Boone","Mississippian,Lower- Mississippian,Upper","Arkoma basin,Chautauqua platform,Cherokee basin","AR,KS,MO,OK",""
"Boonton","Jurassic,Lower","Piedmont-Blue Ridge province,Newark basin","NJ","Brunswick Group",""
"Boracho Sandstone Limestone","Cretaceous,Lower","Permian basin","TX",""
"Borden","MIssissippian","Cincinnati arch,Appalachian basin,Illinois basin","IL,IN,KY,OH,TN,WV"
"Bosworth","Cambrian,Upper","Canadian Rockies","BC"
"Bow River","Proterozoic","Green River basin","ab,WY","","(+Bow River Quartzite (WY*) shortened to Bow Quartzite of Phantom Lake Metamorphic Suite.  See Bow.","
"Bowling Green Dolomite","Silurian,Lower- Ordovician,Upper","Lincoln anticline","IL,MO","Edgewood Group",""
"Box Butte","Miocene","Chadron arch","NE","Hemingford Group",""
"Bozeman","Eocene- Oligocene- Miocene- Pliocene","Montana folded belt province","MT",""
"Brad","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX","Canyon Group",""
"Brainard Shale","Ordovician,Upper","Iowa shelf","IA,IL,IN?,WI","Maquoketa Shale",""
"Braintree","Cambrian,Middle","New England province","MA",""
"Brallier","Devonian,Upper","Appalachian basin","MD,PA,TN,VA,WV",""
"Branch Canyon Sandstone","Miocene, early (local)- Miocene, middle (local)- Miocene, late (local)","Transverse Ranges province","CA",""
"Brandon Lignite","Miocene,Lower?","New England Province","VT"
"Brannon Limestone","Ordovician,Middle","Cincinnati arch","KY","Lexington Limestone",""
"Brassfield Dolomite","Silurian,Lower- Silurian, early","Cincinnati arch,Upper Mississippi embayment,Appalachian basin","AL,AR,IN,KY,MS,OH,TN,WV",""
"Brazeau","Cretaceous,Upper","Central hills","AB"
"Breathitt","Pennsylvanian,Lower- Pennsylvanian,Middle","Appalachian basin","KY,OH,TN,VA,WV",""
"Breckenridge","Pennsylvanian,Upper","Bend arch","TX","(+Breckenridge Formation (TX) replaced with Thrifty Formation.  See Thrifty.","
"Brentwood Limestone","Pennsylvanian,Lower","Arkoma basin","AR,OK","Bloyd Formation",""
"Bridal Veil Limestone","Pennsylvanian,Lower","Wasatch uplift","UT","Oquirrh Formation",""
"Bridge Creek Limestone Shale","Cretaceous,Upper","Basin and Range province,Sierra Grande uplift,Salina basin,Denver basin,Las Animas arch,Las Vegas-Raton basin,Anadarko basin,Orogrande basin,San Juan basin","CO,KS,NM,OK","Mancos Shale",""
"Bridger","Eocene","Green River basin","CO,UT,WY",""
"Bridport Dolomite","Ordovician,Lower","New England province","VT","Beekmantown Group",""
"Brierfield Dolomite","Cambrian,Upper","Appalachian basin","AL",""
"Brigham Quartzite","Cambrian,Lower","Northern Rocky Mountain region,Wasatch uplift,Snake River basin,Great Basin region,Great Basin province,Southern Rocky Mountain region","ID,mt,UT"
"Bright Angel Shale","Cambrian,Lower (local)- Cambrian,Middle","Plateau sedimentary province,Salton basin","AZ,CA,NV,UT",""
"Brightseat","Paleocene, early- Paleocene, early","Atlantic Coast basin","DC,MD,nj,VA",""
"Brigus","Cambrian,Lower","SouthEsst Newfoundland","NL,ns"
"Briones Sandstone","Miocene, late","California Coast Ranges province","CA","San Pablo Group",""
"Brisbois","Triassic,Upper","Snake River basin","OR"
"Briscoe","Jurassic,Upper","Sacramento basin","CA","Sanhedrin Formation","(+Briscoe Tongue of Sanhedrin Formation (CA) considered abandoned?  Uncertain if still in use by the CA Geol. Survey.  Abandoned by the USGS.","
"Brockport Limestone","Silurian","Appalachian basin","NY","Brockport Limestone member of the Lockport Dolomite"
"Bromide","Ordovician,Middle","South Oklahoma folded belt","OK,TX","Simpson Group",""
"Browns Park","Oligocene, late- Miocene","Green River basin,Uinta uplift","CO,UT,WY",""
"Browns Pond","Cambrian Lower","New England Province","NY"
"Brownsport","Silurian- Silurian,Upper","Cincinnati arch,Upper Mississippi embayment","MS,TN",""
"Brownstone","Cretaceous, Upper",,"AR"
"Brownstown Sandstone","Pennsylvanian,Middle","Appalachian basin","WV","Kanawha Formation",""
"Brownwood Shale","Pennsylvanian,Upper- Permian","Llano uplift,Bend arch,Fort Worth syncline","TX","Canyon Group",""
"Brule","Oligocene","Chadron arch,Denver basin,Williston basin,Sioux uplift,Wind River basin","CO,MT,ND,NE,SD,WY","White River Group",""
"Brunswick Shale","Triassic,Upper- Jurassic,Lower","Piedmont-Blue Ridge province,Newark basin","NJ,NY,PA","Newark Supergroup",""
"Brush Creek Limestone","Pennsylvanian,Upper","Appalachian basin","KY,MD,OH,PA,WV","Conemaugh Formation"
"Bryant Knob","Silurian,Lower","Lincoln anticline","IL,MO","Edgewood Group",""
"Bryantsville Breccia","Mississippian,Upper","Illinois basin,Cincinnati arch","IN,KY","St Genevieve"
"Bryantsville Limestone","Mississippian,Upper","Illinois basin,Cincinnati arch","IN,KY","Ste. Genevieve Limestone",""
"Buckhorn","Ordovician,Middle","Wisconsin arch,Illinois basin","IA,IL,WI","Dunleith Formation",""
"Buckrange","Cretaceous,Upper","Ouachita folded belt","AR","Ozan Formation",""
"Buffalo Wallow","Mississippian,Upper","Illinois basin","IN,KY",""
"Bull Canyon","","Peninsular Ranges province","CA","Desert Divide Group",""
"Bull Canyon (NM)","Triassic,Upper","Palo Duro basin,Las Vegas-Raton basin","NM"
"Bull Run","Triassic,Upper- Jurassic,Lower","Piedmont-Blue Ridge province,Barboursville basin,Culpeper basin","MD,VA","+Bull Run Formation of Culpeper Group","(Rocks of +Bull Run Formation of Culpeper Group (VA,MD) reallocated to many formations in Culpeper Group.  See Lee and Froelich (1989) entry.","
"Bullion Creek","Paleocene- Paleocene","Williston basin","MT,ND,SD","Fort Union Group",""
"Burditt Marl","Cretaceous,Upper","Ouachita folded belt","TX","Austin Group",""
"Burge","Miocene","Chadron arch","NE","Valentine Formation",""
"Burgner","Pennsylvanian,Middle","Ozark uplift","MO",""
"Burlington Limestone","Mississippian,Lower","Iowa shelf,Anadarko basin,Illinois basin,Ozark uplift","CO (subsurface),IA,IL,in,KS,KY,MO,NE",""
"Burnt Bluff","Silurian,Middle","Michigan basin","MI,WI"
"Burrard","Upper Cretaceous-Eocene","Western BC","BC,wa"
"Burt Ranch","Cretaceous,Lower","Permian basin","TX","Segovia Formation of Edwards Group",""
"Bushberg Sandstone","Mississippian,Lower","Ozark uplift,Illinois basin","IL,MO","Sulphur Springs Formation",""
"Butte Creek Sandstone","Miocene","Snake River Basin","OR"
"Byram","Oligocene, early","Arkla basin,Mid-Gulf Coast basin,South Georgia sedimentary province,Florida platform","AL,FL,GA,LA,MS",""
"Byrons","Silurian,Middle","Michigan basin","MI,WI","Burnt Bluff Group"
"Caddo Creek","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX","Canyon Group",""
"Cadiz","Cambrian,Lower- Cambrian,Middle","Mojave basin","CA,NV",""
"Cadotte","Cretaceous,Upper","Deep basin area","AB"
"Cairn","Devonian,Upper","Candain Rockies","AB"
"Calcareous Formation","Ordovician","Western New England","CT,MA,NY?,VT",,"Mid 19th Century terminology-obsolete"
"Calhoun Coal","Pennsylvanian,Upper","Illinois basin","ks,IL","Mattoon Formation of McLeansboro Group",""
"Calico Bluff","Mississippian,Upper- Pennsylvanian,Lower","Alaska East-Central region","AK",""
"Caliente","Miocene","California Coast Ranges province,Transverse Ranges province","CA",""
"Callaway Limestone","Devonian,Middle","Ozark uplift","MO",""
"Caloosahatchee Marl","Pliocene, late- Pleistocene, early- Pleistocene, middle","Florida platform","FL",""
"Calumet","Precambrian- Proterozoic,Middle","Wisconsin arch","MI","Portage Lake Volcanics",""
"Calumet (Canada)","Devonian","Northern Alberta","AB","Calumet member of Waterways formation"
"Calvert","Oligocene, late- Miocene, early- Miocene, middle","Atlantic Coast basin","DE,ma,MD,VA","Chesapeake Group",""
"Camelback Mountain Quartzite","Ediacaran?-Cambrian,Lower","Northern Rocky Mountain region,Snake River basin","ID"
"Camp Colorado Limestone","Permian,Lower","Bend arch,Llano uplift","TX","Pueblo Formation of Cisco Group",""
"Camp Rice","Pleistocene- Pliocene","Permian basin","co,NM,TX","Santa Fe Group",""
"Campito Sandstone","Cambrian,Lower","Great Basin province","CA,NV",""
"Candelaria","Triassic,Lower","Great Basin province","CA,NV",""
"Cane Acre","Cretaceous,Upper","Atlantic Coast basin","SC","the Black Creek Group",""
"Canepatch","Pleistocene,Middle","Atlantic Coast Basin","NC,SC"
"Cane River","Eocene","Arkla basin","AR,LA","Claiborne Group",""
"Caney Point Marl","Eocene","Desha basin","AR","White Bluff"
"Caney Shale","Mississippian,Upper","Arkoma basin,South Oklahoma folded belt,Ouachita folded belt","AR,OK",""
"Cannelton Limestone","Pennsylvanian,Middle","Appalachian basin","VA,WV",""
"Cannon Limestone","Ordovician,Middle","Cincinnati arch,Appalachian basin","AL,GA,TN,VA",""
"Cannonball","Paleocene- Paleocene","Williston basin","ND,SD","Fort Union Formation",""
"Canyon","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX",""
"Cap Rock","Miocene","Chadron arch","NE,SD","Ash Hollow Formation",""
"Capay","Eocene","Sacramento basin","CA",""
"Cape Cormorants","Ordovician,Middle","Western Newfoundland","NL"
"Cape Fear","Cretaceous,Upper","Atlantic Coast basin","GA,NC,SC",""
"Cape Limestone","Ordovician,Middle","Ozark uplift,Illinois basin","IL,MO",""
"Capistrano","Pliocene- Miocene","Los Angeles basin","CA",""
"Capitan Limestone","Permian,Upper","Permian basin,Orogrande basin","NM,TX",""
"Captain Creek Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Stanton Limestone of Lansing Group",""
"Carbondale","Pennsylvanian,Middle","Illinois basin,Wisconsin arch","IL,IN,KY",""
"Cardium","Cretaceous,Upper","West-Central Alberta,NE British Columbia","AB,BC"
"Carlin","Devonian,Lower","Appalachian basin","NY",""
"Carlin Canyon","tertiary",,"NV"
"Carlisle Shale","Cretaceous,Upper",,"AB,CO,KS,mt,ND,NE,NM,SD,WY",
"Carlton","Jurassic,Middle","Black Mesa basin,Great Basin province,Green River basin,Paradox basin,Plateau sedimentary province,San Juan basin,Uinta basin,Uinta uplift","AZ,CO,NM,UT,WY",""
"Carmel","Jurassic,Middle",,"CO,UT,WY","San Rafael group"
"Carrara","Cambrian, Lower-Middle","Great Basin province","CA(se),NV(s)","Carrara Canyon, Bare Mountain quadrangle, Nye Co, NV",""
"Carrizo (California)","Pliocence","Coastal Ranges","CA"
"Carrizo","Eocene,Middle","Gulf Coast basin,East Texas basin","AR,LA,TX"
"Carterville","Mississippian,Upper","Ozark uplift","MO",""
"Caseyville","Pennsylvanian,Lower- Pennsylvanian,Middle","Illinois basin,Iowa shelf","IA,IL,KY",""
"Cashaqua Shale","Devonian,Upper","Appalachian basin","MD,NY,OH,PA,WV","Sonyea Formation ",""
"Cassin","Ordovician,Lower","New England province,Adirondack uplift","NY,VT","","(+Cassin Formation (NY, VT) is synonym of Fort Cassin Formation.  See Fort Cassin.","
"Cassville Shale","Pennsylvanian,Upper- Permian,Lower","Appalachian basin","OH,PA,WV","Waynesburg Formation",""
"Castle Hayne","Eocene, middle","Atlantic Coast basin","NC,SC",""
"Castleton Conglomerate","Cambrian,Lower","New England province,Adirondack uplift","NY,VT",""
"Castner Limestone","Precambrian- Proterozoic","Southwestern Basin and Range region","NM?,TX",""
"Cathedral (Canada)","Cambrian,Middle","Canadian Rockies","AB,BC"
"Cathedral","Cretaceous,Lower","Northern Cascade Range-Okanagan province","WA","Horseshoe Basin Group",""
"Catheys","Ordovician,Middle- Ordovician,Upper","Cincinnati arch,Appalachian basin","AL,GA,KY,TN,VA",""
"Catoche","Ordovician,Lower","Western Newfoundland","NL"
"Catskill","Devonian,Middle- Devonian,Upper- Mississippian,Lower","Appalachian basin","MD,NY,OH,PA,WV",""
"Cedar District","Cretaceous,Upper","Western Columbia basin","WA","Nanaimo Group",""
"Cedar Lake","Cambrian","Piedmont-Blue Ridge province","AL,GA","Ropes Creek Metabasalt",""
"cedar Lake (MB)","Silurian",,"MB"
"Cedar Mountain Conglomerate","Triassic,Upper- Jurassic,Lower","Piedmont-Blue Ridge province,Culpeper basin","VA","Bull Run Formation","(+Cedar Mountain Conglomerate Member of Bull Run Formation (VA) replaced with Mountain Run Member of Tibbstown Formation.  See Mountain Run.","
"Cedar Mountain (UT)","Cretaceous,Lower","Great Basin province,Green River basin,Paradox basin","CO,UT"
"Cedar Valley Limestone","Devonian,Middle- Devonian,Upper","Iowa shelf,Illinois basin,Ozark uplift,Lincoln anticline,Wisconsin arch","IA,IL,MN,MO",""
"Cedarville Dolomite","Silurian- Silurian, middle","Cincinnati arch","IN,OH",""
"Centerfield Limestone Shale","Devonian,Middle","Appalachian basin","MD,NY,OH,PA,WV","Ludlowville Shale",""
"Central Valley Sandstone","Devonian,Lower","Appalachian basin","NY",""
"Centralia","Paleozoic,Upper",,"IL"
"Cerro Gordo","Cretaceous,Lower(?)- Cretaceous,Upper","Caribbean region","PR",""
"Cerro Gordo (IA)","Devonian,Upper",,"IA"
"Chadakoin","Devonian,Upper","Appalachian basin","NY,PA",""
"Chadron","Eocene, late or Oligocene, early- Eocene, late or Oligocene, early","Chadron arch,Denver basin,Williston basin,Sioux uplift,Wind River basin,Green River basin","CO,MT,ND,NE,SD,WY",""
"Chaffee","Devonian,Upper- Mississippian,Lower","Eagle basin,Piceance basin,South Park basin,Green River basin","CO",""
"Chalk Bluff","Permian,Upper","Permian basin","NM","(+Chalk Bluff Formation (NM) abandoned.","
"Chalk Bluff (California)","Eocene","Sierra Nevada Range","CA"
"Chalk Butte","Pliocene,Middle","Snake River basin","OR"
"Challis","Eocene","Idaho Mountains province,Snake River basin","ID,MT?",""
"Chamberlains Brook","Cambrian,Middle","Canadian Maritimes,SE Newfoundland","NB,NL"
"Chambersburg","Ordovician,Middle","Appalachian basin","MD,PA,VA,WV",""
"Chambless Limestone","Cambrian,Lower","Mojave basin","CA",""
"Chamita","Miocene","Estancia basin","ne,NM","Santa Fe Group",""
"Champlain Sea","Holocene","Champlain Valley,St Lawrence Valley","NY,ON,QC,VT"
"Chandler Falls","Ordovician,Middle","Michigan basin","MI","Trenton Group",""
"Chandler","Cretaceous,Lower- Cretaceous,Upper","Alaska Northern region","AK","Nanushuk Group","(+Chandler Formation of Nanushuk Group (AK*) abandoned.  Rocks reassigned to upper (nonmarine) Nanushuk Formation.  See Nanushuk.","
"Chapel Coal","Pennsylvanian,Upper","Illinois basin","IL","Modesto Formation of McLeansboro Group",""
"Chapel Is","Cambrian,Middle","Canadian Maritimes,SE Newfoundland","NB,NL"
"Chapman Sandstone","Devonian,Lower","New England province","ME","Dockendorff Group",""
"Chappel Limestone","Mississippian,Lower","Llano uplift","TX",""
"Charlevoix Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Chattanooga Shale","Devonian,Middle- Devonian,Upper- Mississippian,Lower","Appalachian basin,Cincinnati arch,Upper Mississippi embayment,Illinois basin,Ozark uplift","AL,AR,GA,IL,IN,KS,KY,MO,MS,OH,OK,TN,VA",""
"Chaumont Limestone","Ordovician,Middle","Appalachian basin","NY,on","(+Chaumont Formation or +Chaumont Limestone (NY) abandoned.","
"Chazy","Ordovician,Middle","Adirondack uplift,New England province,Appalachian basin","KY,md,NY,OH,on,qc,VT,WV",""
"Chemung","Devonian,Upper","Appalachian basin","MD,NY,PA,VA,WV",""
"Cherokee","Pennsylvanian,Middle","Cherokee basin,Anadarko basin,Iowa shelf","CO (subsurface),IA,KS,MO,NE,OK,TX",""
"Cherry Valley Limestone Shale","Devonian,Middle","Appalachian basin","MD,NY,OH,PA,WV","Marcellus Shale",""
"Cherryvale Shale","Pennsylvanian","Cherokee basin","IA,KS,MO,NE","Kansas City Group",""
"Chesapeake","Oligocene- Miocene- Pliocene","Atlantic Coast basin","DC,DE,MD,NC,VA",""
"Cheshire","Cambrian,Lower","New England province","CT,MA,qc,VT",""
"Chester","Mississippian,Upper",,"al,il,in,ok,tn"
"Chester (Vermont)","Cambrian","New England province","MA,VT",""
"Cheswold Sand","Miocene?-Pliocene?-Pliestocene?","Atlanic Coastal basin","DC,DE,MD,NC,NJ,SC,VA"
"Chickamauga","Ordovician,Middle- Ordovician,Upper","Piedmont-Blue Ridge province,Appalachian basin","AL,GA,TN,VA",""
"Chickasha","Permian- Permian,Lower","Anadarko basin","OK","El Reno Group",""
"Chico (CA)","Cretaceous",,"CA"
"Chico","Oligocene- Miocene","Las Vegas-Raton basin","NM",""
"Chilliwack Group","Permian","Cascade province","bc,WA"
"Chimney Divide Coal","Triassic,Upper","Black Mesa basin,Great Basin province,Green River basin,Las Vegas-Raton basin,Orogrande basin,Palo Duro basin,Paradox basin,Permian basin,Piceance basin,Plateau sedimentary province,San Juan basin,Sierra Grande uplift,Uinta basin,Uinta uplift,Wasatch uplift","AZ,CO,NM,NV,TX,UT","",
"Chimneyhill Limestone","Silurian","Arkoma basin,South Oklahoma folded belt","OK"
"Chinle","Triassic,Upper","Black Mesa basin*,Great Basin province*, Green River basin*, Las Vegas-Raton basin*, Orogrande basin,Palo Duro basin*,Paradox basin*,Permian basin,Piceance basin*, Plateau sedimentary province*,San Juan basin*,Sierra Grande uplift*, Uinta basin*,Uinta uplift*,Wasatch uplift*","AZ(n),CO(w),NM,NV,TX,UT"
"Chipola","Miocene, early","Mid-Gulf Coast basin,Florida platform,South Georgia sedimentary province","AL,FL,GA","Alum Bluff Group",""
"Chisolm Shale","Cambrian,Middle","Great Basin province","NV,UT"
"Chisum Quarry","Pennsylvanian,Middle","Chautauqua platform,Arkoma basin","OK","McCully Formation",""
"Chloropagus","Miocene-Pliocene","Great Basin province","NV"
"Choptank","Miocene,Middle-Miocene,Upper","Atlantic Coast Basin","DE,MD,VA","Calvert Group"
"Chouteau","Mississippian,Lower","Ozark uplift,Illinois basin,Lincoln anticline,Iowa shelf,Forest City basin,Nemaha anticline,Salina basin,Chadron arch,Denver basin","IA,IL,KS,MO,NE",""
"Chowan River","Pliocene, late","Atlantic Coast basin","NC,VA","Chesapeake Group",""
"Chrysler Limestone","Silurian,Upper- Devonian,Lower","Appalachian basin","NY",""
"Chuar","Precambrian- Proterozoic,Upper","Southern Rocky Mountain region","AZ","Grand Canyon Supergroup",""
"Chuckanut","Eocene- Paleocene- Paleocene- Cretaceous,Upper","Bellingham basin","WA",""
"Chugwater","Triassic,Lower- Triassic,Upper","Denver basin,Powder River basin,Green River basin,Yellowstone province,Wind River basin,Big Horn basin","CO,MT,WY",""
"Cibolo","Permian,Lower","Permian basin","TX",""
"Cierbo Sandstone","Miocene, late","California Coast Ranges province","CA","San Pablo Group",""
"Cincinnatian","Ordovician,Upper","Cincinnati arch","il,IN,KY,OH","Includes Richmond and earlier rocks"
"Cisco","Pennsylvanian,Upper- Permian,Lower","Bend arch,Fort Worth syncline","NM?,OK?,TX",""
"Citronelle","Pliocene-Pleistocene","Mid-Gulf Coast basin,Gulf Coast basin,South Georgia sedimentary province","AL,FL,LA,MS,TX"
"Clagett","Cretaceous,Upper","Southern Alberta,Northern Montana","AB,MT"
"Claiborne","Eocene, early- Eocene, middle","Mid-Gulf Coast basin,South Georgia sedimentary province,Gulf Coast basin,Upper Mississippi embayment,Florida platform,Ouachita folded belt,Arkla basin,Black Warrior basin","AL,AR,FL,GA,KY,LA,MO,MS,TN,TX",""
"Clallam","Miocene,Lower","Olympic Mountains province","WA","Strait of Juan de Fuca, Clallam Co, WA",""
"Clarendon Springs Dolomite","Cambrian,Upper- Ordovician,Lower- Silurian, middle","New England province","MA,VT","Stockbridge Group",""
"Clarita","Silurian,Lower- Silurian, middle","South Oklahoma folded belt,Arkoma basin","OK",""
"Clarksville","Ordovician,Upper","Cincinnati arch","IN,KY,OH","Waynesville Formation",""
"Clarno","Eocene-Oligocene","Eastern Columbia basin,Blue Mountains province","OR",""
"Clays Ferry","Ordovician,Middle","Cincinatti arch","IN,KY,OH"
"Clayton","Paleocene- Paleocene","Mid-Gulf Coast basin,Atlantic Coast basin,Gulf Coast basin,Illinois basin,Upper Mississippi embayment,Arkla basin","AL,AR,GA,IL,KY,LA,MO,MS,TN","Midway Group",""
"Clear Creek","Devonian,Lower","Illinois basin","IL,IN,KY,MO",""
"Clear Fork","Pliocene, late to Holocene- Pliocene, late to Holocene","California Coast Ranges province","CA",""
"Clear Fork (TX)","Permian,Lower","Permian basin,Bend arch,Palo Duro basin","TX"
"Clear Lake","Pliocene-Holocene","Coast Ranges Province","CA"
"Clear Lake (MB)","Silurian",,"MB"
"Cleveland Shale","Devonian,Upper","Appalachian basin","AL,GA,KY,OH,TN,VA,WV","Ohio Shale",""
"Clifty Limestone","Devonian,Middle","Ozark uplift","AR",""
"Clinchfield","Eocene, late- Eocene, middle","South Georgia sedimentary province,Atlantic Coast basin","GA,SC",""
"Clinton","Silurian- Silurian,Lower(?)- Silurian,Lower- Silurian, middle","Appalachian basin","al,KY,MD,MI,NY,OH,PA,TN,VA,WV",""
"Clough","Silurian,Lower","New England province","CT,MA,ME,NH,VT",""
"Clover Creek","Permian-Triassic","Snake River basin","OR"
"Cloverly","Cretaceous,Lower","Powder River basin,Big Horn basin","CO,MT(cs),UT,WY",""
"Clyde","Permian,Lower","Bend arch","TX","Wichita Group",""
"Coaledo","Eocene","Western Columbia basin","OR",""
"Cobourg Limestone","Ordovician,Middle","Appalachian basin","NY,on,qc",""
"Coburn","Ordovician,Middle- Ordovician,Upper","Appalachian basin","PA","the Trenton Group",""
"Coconino Sandstone","Permian,Lower","Great Basin province,Plateau sedimentary province,Salton basin,Basin and Range province,Black Mesa basin","AZ,CA,NV,UT",""
"Cody Shale","Cretaceous,Upper","Montana folded belt province,Central Montana uplift,Big Horn basin,Powder River basin,Wind River basin","ID?,MT,WY",""
"Coeymans","Devonian,Lower","Appalachian basin","MD,NJ,NY,PA,VA,WV","Helderberg Group",""
"Coffee Creek","Mississippian","Eastern Columbia Basin","OR"
"Coffeeville","Pennsylvanian,Upper","Chatauqua platform","OK"
"Cohansey","Miocene, middle- Miocene, late- Pliocene(?)","Atlantic Coast basin","DE,MD,NJ,PA",""
"Coldwater","Mississippian,Lower","Michigan basin","IN,MI",""
"Coldwater (California)","Eocene","Peninsular Ranges","CA"
"Colina Limestone","Permian,Lower","Pedregosa basin,Basin and Range province","AZ,NM","Naco Group",""
"Collingwood","Ordovician,Upper","Michigan basin,Appalachian basin","MI,on,PA,WI",""
"Colony Creek Shale","Cretaceous,Lower- Cretaceous,Upper","Basin and Range province,Chadron arch,Williston basin,Powder River basin,Montana folded belt province,Central Montana uplift,Sweetgrass arch,Denver basin,Big Horn basin","CO,IA,ID,KS,MN,MT,ND,NE,NM,OK,SD,TX,UT,WY"
"Colorado","Cretaceous,Lower-Cretaceous-Upper","Basin and Range province,Chadron arch,Williston basin,Powder River basin,Montana folded belt province,Central Montana uplift,Sweetgrass arch,Denver basin,Big Horn basin","CO*,IA*,KS*,MN*,MT*,NE*,NM,ND*,OK*,SD*,UT*,WY*","Colorado Group"
"Colter","Miocene, early- Miocene, middle","Yellowstone province","WY",""
"Columbia","Miocene,Upper-Pliocene-Pleistocene","Atlantic Coast basin","DC,DE,MD,NC,NJ,SC,VA",""
"Columbia River Basalt","Miocene","Idaho Mountains province,Eastern Columbia basin","ID,OR,WA"
"Columbiana","Ordovician,Middle","Appalachian basin","AL",""
"Columbiana (OH)","Pennsylvanian,Middle","Appalachian basin","OH,PA"
"Columbus Limestone","Devonian,Lower- Devonian,Middle","Appalachian basin","ky,OH,PA,WV",""
"Comanche Peak Limestone","Cretaceous,Lower","Permian basin,Strawn basin,Bend arch,Ouachita folded belt,Llano uplift","TX","Fredericksburg Group",""
"Commotion","Cretaceous,Lower","Eastern British Columbia","AB,BC"
"Comox","Cretaceous,Upper","Western Columbia basin","bc,WA","Nanaimo Group",""
"Conasauga","Cambrian,Middle- Cambrian,Upper","Appalachian basin,Black Warrior basin","AL,GA,KY,MS,TN,VA,WV",""
"Concha Limestone","Permian,Lower- Permian,Upper(?)","Pedregosa basin,Basin and Range province","AZ,NM","Naco Group",""
"Conemaugh","Pennsylvanian,Upper","Appalachian basin","IL,KY,MD,OH,PA,WV",""
"Conewango","Devonian,Upper","Appalachian basin","NY,PA",""
"Congaree","Eocene, early- Eocene, middle","Atlantic Coast basin,South Georgia sedimentary province","GA,SC","Orangeburg Group",""
"Conococheague Limestone","Cambrian,Upper- Ordovician,Lower","Appalachian basin","MD,PA,TN,VA,WV",""
"Cook Mountain","Eocene, middle","East Texas basin,Arkla basin,Black Warrior basin,Mid-Gulf Coast basin,Upper Mississippi embayment","AR,KY,LA,MO,MS,TN,TX","Claiborne Group",""
"Coon Hollow Mudstone","Jurassic,Upper","Eastern Columbia basin","ID,OR,WA"
"Cooper Canyon","Triassic,Upper","Permian","TX","Dockum Group"
"Cooper (MO) Limestone","Devonian","Central Missouri","mo"
"Cooper","Miocene, early(?)- Oligocene- Eocene, late","Atlantic Coast basin,South Georgia sedimentary province","GA,SC",""
"Copper Basin","Cambrian,Upper- Ordovician,Lower(?)","Appalachian basin,Black Warrior basin","AL,GA,KY,MS,OH,TN,VA,WV",""
"Copper Basin (NV)","Eocene","Basin and Range province","NV"
"Copper Ridge Dolomite","Cambrian,Upper-Ordovician,Lower","Appalachian basin,Black Warrior basin","AL,GA,KY,MS,OH,TN,VA,WV"
"Coquille","Pleistocene","Western Columbia basin","OR"
"Cordell Dolomite","Silurian, middle","Michigan basin","MI,WI","Manistique Group",""
"Cornell Dam","Miocene","Chadron arch","NE","Valentine Formation of Ogallala Group",""
"Cornfield Springs","Cambrian,Middle(?)","Great Basin province","CA,NV","","(+Cornfield Springs Formation (CA,NV) is synonym of Nopah Formation.  See Nopah.","
"Coronado Sandstone","Cambrian,Middle- Cambrian,Upper","Basin and Range province,Pedregosa basin","AZ,NM",""
"Corriganville Limestone","Devonian,Lower","Appalachian basin","MD,PA,VA,WV",""
"Corry Sandstone","Devonian,Upper- Mississippian,Lower","Appalachian basin","NY,PA",""
"Corsicana Marl","Cretaceous,Upper","East Texas Basin","TX(ne)",
"Coryville Shale","Ordovician,Upper","Cincinnati arch","IN,OH","Grant Lake"
"Coso","Miocene-Pliocene","Great Basin Province","CA"
"Cotter Dolomite","Ordovician,Lower","Ozark uplift,Upper Mississippi embayment,Illinois basin,Cherokee basin,Chautauqua platform,Salina basin,Central Kansas uplift,Forest City basin,Nemaha anticline,Anadarko basin,Arkoma basin","AR,IL,KS (subsurface),MO,OK",""
"Council Grove","Permian,Lower","Sedgwick basin,Forest City basin,Nemaha anticline,Anadarko basin,Las Animas arch,Salina basin,Chautauqua platform,Denver basin","CO (subsurface),KS,NE,OK",""
"Cow Bayou","Paleocene- Paleocene","Arkla basin","LA,TX","Logansport Formation",""
"Cow Head","Ordovician,Lower","Western Newfoundland","NL"
"Cowlitz","Eocene, middle- Eocene, late","Oregon-Washington Coast Ranges province","OR,WA",""
"Coyote Butte","Permian,Lower","Eastern Columbia basin","OR"
"Cozydell","Eocene","Coast Ranges province","CA"
"Crab Orchard","Silurian,Lower- Silurian, middle","Cincinnati arch","KY,OH",""
"Crab Orchard Mountains","Pennsylvanian",,"tn"
"Creede","Oligocene","San Juan Mountains province","CO",""
"Croatan","Pliocene- Pleistocene","Atlantic Coast basin","NC,VA",""
"Cross Limestone","Eocene, middle- Eocene, late","Atlantic Coast basin","GA,SC","Santee Limestone",""
"Crown Conglomerate","Pleistocene, late","Snake River basin","ID",""
"Crown Point Limestone","Ordovician,Middle","New England province,Appalachian basin","NY,VT","Chazy Group",""
"Crowsnest","Cretaceous,Lower","Southwest Alberta","AB,BC"
"Cumberland Head","Ordovician,Middle","New England province,Appalachian basin","NY,VT",""
"Cumnock","Triassic,Upper","Piedmont-Blue Ridge province,Sanford basin,Durham basin,Deep River basin","NC","Chatham Group of Newark Supergroup",""
"Cuslett","Cambrian,Lower","SouthEast Newfoundland,Canadain Maritimes","NL,NS"
"Cusseta","Cretaceous,Upper","South Georgia sedimentary province,Mid-Gulf Coast basin","AL,GA",""
"Cussewago Sandstone","Devonian,Upper- Mississippian,Lower","Appalachian basin","OH,PA,WV",""
"Cutler","Permian,Lower","Paradox basin,San Juan basin,San Juan Mountains province,Black Mesa basin,Uinta basin,Piceance basin","AZ,CO,NM,UT",""
"Cutting Dolomite","Ordovician,Lower","New England province","NY,VT","Beekmantown Group",""
"Cuyahoga","Mississippian,Lower","Appalachian basin","NY,OH,PA,WV",""
"Cynthiana","Ordovician,Middle","Cincinnati arch","KY,OH",""
"Cypress Hills","Eocene,Upper-Miocene","Southern Saskatchewan","SK"
"Cypress Sandstone","Mississippian,Upper","Cincinnati arch,Illinois basin","IL,IN,KY,MO,TN",""
"Dakota Sandstone","Cretaceous,Lower (local)- Cretaceous,Upper","Basin and Range province,Black Mesa basin,Central Kansas uplift,Denver basin,Eagle basin,Green River basin,Iowa shelf,Las Animas arch,Las Vegas-Raton basin,North Park basin,Orogrande basin,Palo Duro basin,Paradox basin,Piceance basin,Plateau sedimentary province,Powder River basin,San Juan basin,Sierra Grande uplift,Sioux uplift,South Park basin,Sweetgrass arch,Uinta basin,Williston basin","AZ,CO,IA,KS,MN,MT,ND,NE,NM,OK,SD,TX,UT,WY",""
"Davenport","Devonian,Middle","Iowa shelf","IA"
"Davis","Cambrian, upper","Ozark uplift,Illinois basin,Upper Mississippi embayment,Chautauqua platform,Cherokee basin","IL,IN,KS, MN,MO,OK"
"Dawson Bay","Devonian,Middle","Williston basin","mb,MT,ND,SD",""
"Day Creek Dolomite","Permian,Lower","Las Animas arch,Las Vegas-Raton basin,Anadarko basin","CO,KS,NE,OK",""
"Day Point Limestone","Ordovician,Middle","New England province,Appalachian basin","NY,VT",""
"Days Creek","Cretaceous,Lower","Western Columbia basin","OR","Myrtle Group",""
"Dayton Dolomite Shale","Silurian, middle","Cincinnati arch","KY,OH,WV","Alger Shale",""
"DeBeque","Eocene- Paleocene- Paleocene","Piceance basin","CO",""
"Dead Horse Conglomerate","Ordovician,Lower","Piceance basin","CO","Manitou Formation of Horseshoe Mountain Group",""
"Dead Horse Tuff","Eocene,Upper","Great Basin province","NV"
"Decatur Limestone","Silurian- Silurian, middle- Silurian,Upper- Devonian,Lower","Cincinnati arch,Illinois basin","KY,TN",""
"Decker Ferry Limestone","Silurian,Upper","Appalachian basin","NJ","(+Decker Ferry Limestone or +Decker Ferry Formation (NJ) renamed Decker Limestone.  See Decker.","
"Decorah","Ordovician,Middle","Iowa shelf,Illinois basin,Wisconsin arch,Ozark uplift,Upper Mississippi embayment","IA,IL,MN,MO,WI",""
"Deep River","Miocene","Montana folded belt province","MT,wy"
"Deep Springs","Cambrian,Lower","Great Basin province","CA,NV","",
"Deepkill","Ordovician,Lower-Ordovician,Middle","New England province","NY,VT"
"Deer Butte","Miocene-Pliocene,Lower","Snake River basin","OR"
"Deer Creek Limestone","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE,OK,wy","Shawnee Group",""
"Del Carmen Limestone","Cretaceous,Lower","Permian basin","TX",""
"Del Mar","Eocene","San Diego basin","CA"
"Del Rio Clay","Cretaceous,Upper","Permian basin,Ouachita folded belt,Orogrande basin","MX,NM,TX","Washita Group",""
"Delaware Limestone","Devonian,Middle","Appalachian basin","ky,OH,PA",""
"Delaware Mountain","Permian","Permian basin","NM,TX"
"Delight","Cretaceous,Lower","Ouachita folded belt","AR","Trinity Group",""
"Delight Fauna","Pliocene-Pleistocene","Adams,Franklin Counties","WA"
"Delorme","Silurian-Devonian",,"NT,YT"
"Demopolis Chalk","Cretaceous,Upper","Black Warrior basin,Mid-Gulf Coast basin,Upper Mississippi embayment","AL,MS,TN","Selma Group",""
"Denault Dolomite","Proterozoic","Labrador Trough","NL"
"Denley Limestone","Ordovician,Middle","Appalachian basin","NY"
"Denver","Cretaceous,Upper- Paleocene- Paleocene","Denver basin","CO",""
"Des Moines","Pennsylvanian,Middle","Iowa shelf","IA,il,in,ks,ky,ok",""
"Deschutes","Pliocene- Miocene","Eastern Columbia basin","OR",""
"Desert Peak","Pliocene, early","Great Basin province","NV",""
"Detroit River","Devonian,Middle","Michigan basin","IN,MI,OH","Muscatatuck Group",""
"Devil's Graveyard","Eocene-Oligocene","Permian basin","TX"
"Dewey Limestone","Pennsylvanian,Upper","Chautauqua platform","KS,OK","Skiatook Group",""
"Diablo","Miocene","California Coast Ranges province","CA","Neroly Formation",""
"Diablo (NV)","Permian","Great Basin province","NV"
"Dickerson","Pennsylvanian","Fort Worth syncline,Bend arch,Strawn basin","TX","Millsap Lake Group",""
"Dierks Limestone","Cretaceous,Lower","Ouachita folded belt","AR","Trinity Group",""
"Dighton Conglomerate","Pennsylvanian,Upper","New England province","MA,RI"
"Dillsboro","Ordovician,Upper","Cincinnati arch","IN",""
"Dinosaur Canyon","Jurassic,Lower- Triassic,Upper(?)","Plateau sedimentary province,Great Basin province,Black Mesa basin","AZ,NV,UT","Moenave Formation",""
"Dinosaur Park","Cretaceous,Upper","Southern Alberta","AB","Judith River Group"
"Dinwoody","Permian- Triassic,Lower","Montana folded belt province,Yellowstone province,Big Horn basin,Green River basin,Wind River basin,Wasatch uplift","ID,MT,UT,WY",""
"Dock Street Clay","Devonian,Middle","Michigan basin","MI","Four Mile Dam Formation",""
"Dockum","Triassic,Middle (local)- Triassic,Upper","Permian basin,Las Vegas-Raton basin,Palo Duro basin,Sierra Grande uplift,Anadarko basin","CO,KS,NM,OK,TX",""
"Dolgeville Limestone","Ordovician,Middle","Applachian basin","NY"
"Dolores","Triassic,Upper","Paradox basin,San Juan Mountains province,San Juan basin","CO",""
"Dome Limestone","Cambrian,Middle","Great Basin province","NV,UT"
"Doniphan Limestone Shale","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Lecompton Limestone",""
"Donovan","Jurassic,Lower","Eastern Columbia basin","OR"
"Dothan","Pennsylvanian,Middle","Bend arch","TX"
"Dothan (OR)","Jurassic","Klamath Mountains province","CA,OR"
"Dotsero","Cambrian,Upper","Eagle basin,Piceance basin","CO",""
"Douglas Creek","Eocene","Piceance basin,Uinta basin","CO,UT"
"Douglas","Holocene, early","Wisconsin arch","WI","Miller Creek Formation",""
"Douglas (KS)","Pennsylvanian,Upper","Anadarko basin,Forest City basin,Cherokee basin","CO,IA,KS,MO,NE"
"Dove Spring","Miocene, middle to Miocene, late","Mojave basin","CA","[+]Ricardo Group",""
"Dover Limestone","Pennsylvanian,Upper","Cherokee basin,Forest City basin","IA,KS,MO,NE,OK","Stotler Limestone",""
"Dowling","Cretaceous",,"AB"
"Drakes","Ordovician,Upper","Cincinnati arch","IN,KY,OH",""
"Drewsey","Miocene","Southern Oregon basin","OR"
"Drum Limestone","Pennsylvanian","Cherokee basin","IA,KS,MO,NE","Kansas City Group","
"Drum Oolite","Pennsylvanian","Cherokee basin","IA,KS,MO,NE","Kansas City Group","
"Drumheller Marine Tongue","Cretaceous","Central Alberta","AB","Horshoe Canyon Formation"
"Drumheller","Holocene","Eastern Columbia basin","WA",""
"Duchesne River","Paleocene-Eocene-Oligocene","Uinta basin,Piceance basin","CO,UT",""
"Duck Creek Limestone","Cretaceous, Lower","South Oklahoma folded belt,Fort Worth syncline,Permian basin,Strawn basin,Ouachita folded belt","OK(sc),TX(n)",
"Duncannon","Devonian,Upper","Appalachian Basin","PA","Duncannon Member of Catskill Formation"
"Dundee","Devonian,Middle","Michigan basin","in,MI,OH,on",""
"Dunderberg Shale","Cambrian,Upper","Great Basin province","CA,NV,UT","Nopah Formation",""
"Dunham","Cambrian,Lower","New England province","VT",""
"Dunkard","Pennsylvanian,Upper- Permian,Lower","Appalachian basin","MD,OH,PA,WV",""
"Dunleith","Ordovician,Upper- Ordovician,Middle","Sioux uplift","IA,IL,MN,MO,WI","Galena Group",""
"Dunvegan","Cretaceous,Upper","Western Alberta,NE British Columbia","AB,BC"
"Duplin Marl","Pliocene, early- Pliocene, late","Atlantic Coast basin","NC,SC",""
"Eagar","Eocene- Cretaceous,Upper","Black Mesa basin","AZ",""
"Eager","Cambrian,Lower","South Central BC","BC"
"Eagle Ford","Cretaceous,Upper","Ouachita folded belt,Arkla basin,East Texas basin,Gulf Coast basin,Mid-Gulf Coast basin,Atlantic Coast basin,South Georgia sedimentary province,Florida platform","AL,AR,DE,FL,GA,LA,MD,MS,NC,NJ,SC,TX,VA"
"Eagle Point","Ordovician,Middle","Wisconsin arch","IA,IL,MO,WI","Dunleith Formation",""
"Eagleford","Cretaceous,Upper","Ouachita folded belt,Arkla basin,East Texas basin,Gulf Coast basin,Mid-Gulf Coast basin,Atlantic Coast basin,South Georgia sedimentary province,Florida platform","AL,AR,DE,FL,GA,LA,MD,MS,NC,NJ,SC,TX,VA"
"East Arm","Silurian,Lower","Williston basin","MB,MT,ND,SD,SK"
"East Berlin","Jurassic,Lower","New England province,Pomperaug basin,Hartford basin","CT,MA","Newark SUpergroup"
"Eastover","Miocene","Atlantic Coast basin","MD,NC,VA","Chesapeake Group",""
"Eau Claire","Cambrian,Upper","Wisconsin arch,Michigan basin,Iowa shelf,Illinois basin,Cincinnati arch,Sioux uplift,Lincoln anticline","IA,IL,IN,KY,MI,MN,MO,OH,WI",""
"Eden Valley","Eocene",,"WY","Green River"
"Eden","Ordovician,Upper","Cincinnati arch,Appalachian basin","AL,IN,KY,OH,TN,WV",""
"Edgewood Dolomite","Ordovician,Upper- Silurian,Lower","Lincoln anticline,Ozark uplift,Illinois basin,Wisconsin arch,Iowa shelf","IA,IL,IN,MO,WI",""
"Edinburg","Ordovician,Middle- Ordovician,Upper","Appalachian basin","VA,WV",""
"Edmonton","Cretaceous,Upper","Eastern Alberta","AB"
"Edwards","Cretaceous,Lower","Permian basin,Strawn basin,Kerr basin,Ouachita folded belt,Gulf Coast basin,Llano uplift","TX",""
"Edwardsville","Mississippian,Lower","Cincinnati arch","IN","Borden Group",""
"Egmont Bay","Permian","Prince Edward Island","PE"
"Elbrook Dolomite","Cambrian,Middle- Cambrian,Upper","Appalachian basin","MD,PA,TN,VA,WV",""
"Eldon","Cambrian,Middle","Rocky Mountains","ab,BC"
"Elgin Limestone","Ordovician,Upper","Iowa shelf","IA,MN","Maquoketa Formation",""
"Elk Point","Devonian,Middle","Williston basin","MT,ND,SD",""
"Elk River","Pliocene,Pleistocene","Western Columbia basin","OR"
"Elkhorn Ridge","Pennsylvanian,Middle-Permian","Snake River basin","OR"
"Elkhorn","Ordovician,Upper","Cincinnati arch","IN,OH",""
"Elkton","Eocene","Western Columbia basin","OR"
"Ellesmere Is","Cretaceous,Upper","Northern Ellesmere Is","NU"
"Ellis Bay","Ordovician,Upper","Anticosti","QC"
"Ellis","Jurassic,Middle- Jurassic,Upper","Sweetgrass arch,Montana folded belt province,Williston basin,Central Montana uplift","MT,ND,WY",""
"Elm Point","Devonian","Williston basin","mb,ND","Elk Point Group",""
"Elmdale Shale","Pennsylvanian","Forest City basin,Nemaha anticline","KS,NE,OK","Wabaunsee Group","(+Elmdale Shale, or Elmdale Formation, of Wabaunsee Group (KS*,NE*,OK*) abandoned.","
"Elvins","Cambrian,Upper","Ozark uplift","IA,MO",""
"Ely","Precambrian","Lake Superior region","MN",""
"Ely (NV)","Pennsylvanian","Great Basin province","NV"
"Emigrant","Cambrian,Upper- Cambrian,Middle","Great Basin province","CA,NV",""
"Eminence Dolomite","Cambrian,Upper- Ordovician,Lower","Ozark uplift,Illinois basin,Upper Mississippi embayment,Chautauqua platform,Cherokee basin,Forest City basin,Anadarko basin,Central Kansas uplift,Sedgwick basin","AR,CO,IL,KS (subsurface),MO,OK",""
"Empire","Precambrian- Proterozoic,Middle","Northern Rocky Mountain region","MT","Ravalli Group of Belt Supergroup",""
"Empire (OR)","Miocene","Western Columbia basin","OR"
"Emporia Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE,OK","Wabaunsee Group",""
"English River","Mississippian,Lower- Devonian,Upper","Iowa shelf","IA,IL","Hannibal Group",""
"Englishtown","Cretaceous,Upper","Atlantic Coast basin","DE,MD,NJ","Matawan Group",""
"Eramosa Dolomite","Silurian,Upper","Appalachian basin","NY"
"Escabrosa","Mississippian,Lower- Mississippian,Upper","Pedregosa basin,Basin and Range province","AZ,NM",""
"Escuminac","Devonian,Upper","St Lawrence Valley","QC,NB"
"Eskridge Shale","Pennsylvanian","Nemaha anticline","KS,NE,OK","Council Grove Group",""
"Esopus","Devonian,Lower","Appalachian basin","NJ,NY,PA",""
"Etchegoin","Miocene, late- Pliocene","San Joaquin basin","CA",""
"Ettrain Limestone","Pennsylvanian",,"NT,YT"
"Eugene","Oligocene","Western Columbia basin","OR",""
"Euphemia Dolomite","Silurian, middle","Cincinnati arch","OH",""
"Eureka Sound","Cretaceous,Upper-Tertiary","Southern Ellesmere Is","NU"
"Eureka","Ordovician,Middle- Ordovician,Upper","Great Basin province","CA,ID,NV,UT",""
"Eutaw","Cretaceous,Upper","Black Warrior basin,Mid-Gulf Coast basin,South Georgia sedimentary province,Upper Mississippi embayment","AL,FL,GA,MS,TN",""
"Evanston","Cretaceous,Upper- Paleocene- Paleocene","Green River basin,Wasatch uplift,Uinta uplift","ID,UT,WY",""
"Excelsior","Triassic,Middle","Great Basin province","NV",""
"Exshaw","Devonian,Upper - Mississippian,Lower","Sweetgrass arch,Montana folded belt province","ab,MT",""
"Fairfield Pond","Proterozoic,Upper- Cambrian,Lower","New England province","VT",""
"Fairholme","Devonian,Upper","Western Alberta","AB"
"Fairmont Shale","Permian,Lower","Anadarko basin","OK","Hennessey Group",""
"Fairview","Ordovician,Upper","Cincinnati arch,Appalachian basin","IN,KY,OH,PA",""
"Farley Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Wyandotte Limestone of Kansas City Group",""
"Favel","Cretaceous,Upper","Williston basin","ND,sk",""
"Fayetteville (Arkansas)","Mississippian",,"AR"
"Fayetteville","Cambrian- Ordovician","Piedmont-Blue Ridge province","AL","Sylacauga Marble Group",""
"Fentress","Pennsylvanian- Pennsylvanian,Lower","Appalachian basin,Cincinnati arch","TN",""
"Fern Glen Limestone","Mississippian,Lower","Ozark uplift,Forest City basin,Illinois basin","IL,KS,MO",""
"Fernando","Pleistocene- Pliocene","Los Angeles basin","CA",""
"Fernie","Jurassic","Montana folded belt province","ab,MT",""
"Ferron Point","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Fiddlers Green Dolomite","Silurian,Upper","Appalachian basin","NY,on","Bertie Group",""
"Filmore Limestone","Ordovician,Lower","Great Basin province","NV,UT","Pogonip Group"
"Fish Haven Dolomite","Ordovician,Upper","Idaho Mountains province,Great Basin province,Wasatch uplift","ID,NV,UT"
"Fish House Clay","Pleistocene, late","Atlantic Coast basin","NJ",""
"Fisset Brook","Devonian,Upper-Mississipppian","Cape Breton Island","NS"
"Fitch","Silurian- Silurian,Upper- Devonian,Lower","New England province","CT,MA,ME,NH,VT",""
"Flanner Beach","Pleistocene, middle","Atlantic Coast basin","NC",""
"Fleming","Miocene- Pliocene","Gulf Coast basin,Arkla basin","LA,TX",""
"Flint River","Oligocene, late","South Georgia sedimentary province,Atlantic Coast basin,Florida platform","AL,FL,GA,SC",""
"Florence","Pleistocene","Wisconsin arch","WI","Kewaunee Formation",""
"Florence (KS)","Permian","Sedgwick basin,Nemaha anticline,Chautauqua platform","KS,NE,OK"
"Florissant","Oligocene","Denver basin,South Park basin","CO",""
"Flournoy","Eocene,Middle","Oregon-Washington Coast Ranges province,Klamath Mountains province","OR"
"Flowerpot Shale","Permian,Lower","Sedgwick basin,Anadarko basin,South Oklahoma folded belt,Permian basin,Palo Duro basin","KS,NE,OK,TX"
"Flume","Devonian","Northern BC","ab,BC"
"Flume Ridge","Silurian","New England province","ME",""
"Foreknobs","Devonian,Upper","Appalachian basin","MD,PA,VA,WV",""
"Foreman","Jurassic,Middle","Sierra Nevada province","CA",""
"Foremost","Cretaceous,Upper","","AB"
"Fort Adams","Miocene","Mid-Gulf Coast basin","MS","Pascagoula Formation",""
"Fort Ann Limestone","Ordovician,Lower","New England Province","NY"
"Fort Benton","Cretaceous,Lower","Sweetgrass arch,Salina basin,Chadron arch,Williston basin,Powder River basin","AR,SA,KS,MT,NE,NM,SD,TX","(+Fort Benton Group (MT,NE,KS,SD,AR,NM,TX,SA) renamed Benton Group.  See Benton.","
"Fort Cassin","Ordovician,Lower","New England province","NY,VT","Beekmantown Group",""
"Fort Crittenden","Cretaceous,Upper","Basin and Range province,Pedregosa basin","AZ","Sonoita Group",""
"Fort Hayes Limestone","Cretaceous,Upper","Central Kansas uplift,Denver basin,Piceance basin","CO,KS,NE,NM,SD,WY","Niobrara Formation",""
"Fort Payne Chert","Mississippian,Lower- Mississippian,Upper","Appalachian basin,Illinois basin,Black Warrior basin","AL,GA,IL,KY,MS,TN,VA",""
"Fort Randall","Miocene","Sioux uplift","NE,SD",""
"Fort Riley Limestone","Permian,Lower- Pennsylvanian,Upper","Nemaha anticline","KS,NE,OK","Chase Group",""
"Fort Scott Limestone","Pennsylvanian,Middle","Cherokee basin","KS,MO,OK","Marmaton Group",""
"Fort St John","Cretaceous,Lower","Alberta plains","AB"
"Fort Thompson","Pleistocene","Florida platform","FL",""
"Fort Union","Paleocene- Paleocene- Cretaceous,Upper (SD,MT-local)","Powder River basin,Williston basin,Uinta basin,Piceance basin,Central Montana uplift,Green River basin,Big Horn basin,Wind River basin","CO,MT,ND,SD,WY",""
"Fort Worth Limestone","Cretaceous,Lower","Fort Worth syncline,South Oklahoma folded belt,Strawn basin,Ouachita folded belt","LA?,OK,TX","Washita Group",""
"Fortress Mountain","Cretaceous,Lower","Alaska Northern region","AK",""
"Fossil Bay","Silurian","Western Ontario","ON"
"Fossil Brook","Cambrian,Middle","Canadian Maritimes,SE Newfoundland","NB,NL","Chamberlain's Brook"
"Fossil Butte","Eocene, early- Eocene, middle","Green River basin","WY","Green River Formation",""
"Fossil Hill","Triassic,Middle","Great Basin province","NV","Favret Formation of Star Peak Group",""
"Fossils Hill","Silurian","Niagara escarpment in Hamilton region","ON",,"Fossiliferous dolomites below Amabel formation"
"Fosters Point","Cambrian,Lower","SE Newfoundland","NL,ns"
"Fox Hills Sandstone","Cretaceous,Upper","Denver basin,Green River basin,Powder River basin,Williston basin","ab,CO,MT,ND,nm,SD,WY",""
"Francis Creek Shale","Pennsylvanian, Middle","IL","Illinois basin","Francis Creek Shale Member of Carbondale Formation"
"Francis Limestone Shale","Pennsylvanian,Middle","Arkoma basin,Chautauqua platform","OK"
"Franciscan","Miocene- Oligocene- Eocene- Paleocene- Paleocene- Cretaceous- Jurassic- Jurassic,Upper","Santa Cruz basin","CA,OR",""
"Franconia","Cambrian,Upper","Sioux uplift","IA,IL,IN,MI,MN,MO,OH,WI",""
"Frankfort Shale","Ordovician,Upper","Applachian basin","NY"
"Fredonia Limestone","Mississippian,Upper","Illinois basin,Upper Mississippi embayment","IL,IN,KY,MO,TN","Ste. Genevieve Limestone",""
"Freeport Coal","Pennsylvanian,Upper","Appalachian basin","oh,PA,wv","Allegheny Group",""
"Fremont Limestone","Ordovician,Upper","Denver basin,Eagle basin,Las Vegas-Raton basin,San Luis basin,Piceance basin,South Park basin","CO",""
"Frenchman","Cretaceous,Upper",,"SK"
"Frenchman Flat Sandstone","Miocene, late","Los Angeles basin","CA","Ridge Route Formation of Ridge Basin Group",""
"Frenchville","Silurian","New England province","ME"
"Friars","Eocene, middle","Peninsular Ranges province","CA","La Jolla Group",""
"Frisco Limestone","Devonian,Lower","Arkoma basin","OK","Hunton Group",""
"Frontier","Cretaceous,Lower (local)- Cretaceous,Upper","Big Horn basin,Central Montana uplift,Green River basin,Montana folded belt province,Piceance basin,Powder River basin,Snake River basin,Uinta basin,Uinta uplift,Wasatch uplift,Wind River basin,Yellowstone province","CO,ID,MT,UT,WY","Colorado Group",""
"Fruitland","Cretaceous,Upper","Paradox basin,San Juan basin,San Juan Mountains province","az,CO,NM",""
"Fundy Group","Triassic-Jurassic","Maritime provinces","NB,NS"
"Furnace Limestone","Carboniferous?"","Mojave basin","CA",""
"Gabbs","Triassic,Upper","Great Basin province","NV",""
"Gage Shale","Permian","Nemaha anticline","KS,NE,OK?","Doyle Shale of Chase Group",""
"Galena Dolomite","Ordovician,Middle- Ordovician,Upper","Wisconsin arch,Illinois basin,Iowa shelf","IA,IL,MN,WI",""
"Galice","Jurassic,Late","Klamath Mountains province","CA,OR"
"Galisteo","Eocene- Oligocene","Estancia basin,San Juan basin","NM",""
"Gaptank","Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower","Permian basin","TX",""
"Garber Sandstone","Permian,Lower","Anadarko basin,Chautauqua platform","OK",""
"Gardeau Shale","Devonian,Upper","Applachian basin","PA,NY","West Falls Group"
"Garden City Limestone","Ordovician,Lower- Ordovician,Middle","Wasatch uplift,Great Basin province,Snake River basin","ID,UT",""
"Gardner Limestone Dolomite","Mississippian,Lower","Wasatch uplift,Great Basin province","UT","+Gardner Dolomite","(Rocks of +Gardner Dolomite (UT) reallocated to (ascending) Victoria Formation, Pinyon Peak Limestone, Fitchville Formation, Gardison Limestone, and Deseret Limestone.  See Victoria, Pinyon Peak, Fitchville, Gardison, Deseret.","
"Gardners Clay","Pleistocene","Atlantic Coastal basin","NY"
"Garner","Pennsylvanian,Upper (OK)- Pennsylvanian,Middle","Fort Worth syncline","OK,TX","Strawn Group",""
"Garrard Siltstone","Ordovician,Upper","Cincinnati arch","KY",""
"Gasconade Dolomite","Ordovician,Lower","Ozark uplift,Illinois basin,Upper Mississippi embayment,Forest City basin,Chautauqua platform,Cherokee basin,Nemaha anticline,Sedgwick basin,Arkoma basin","AR,IL,KS (subsurface),MO,OK",""
"Gasper","Mississippian,Upper","Cincinnati arch,Appalachian basin","AL?,GA,KY,VA",""
"Gatecliff","Silurian,Lower","Great Basin province","NV",""
"Gatuna","Pleistocene","Permian basin","NM,TX?",""
"Gaviota","Oligocene- Eocene","Santa Maria basin","CA",""
"Gazelle","Devonian,Middle- Devonian,Lower- Silurian","Klamath Mountains province","CA",""
"Genesee","Devonian,Middle- Devonian,Upper","Appalachian basin","MD,NY,OH,PA,VA,WV",""
"Geneseo","Devonian,Middle-Devonian,Upper","Appalachian basin","MD,NY,OH,PA,WV","Genessee formation"
"Genshaw","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Georgia Slate","Ordovician,Lower","New England province","VT",""
"Georgian Bay","Ordovician,Upper","Michigan basin","MI,on",""
"Gering","Miocene- Oligocene, late","Denver basin","NE,wy","Arikaree Group",""
"Gerster","Permian,Lower - Permian,Upper","Great Basin province","NV,UT",""
"Gething","Cretaceous,Lower",,"AB"
"Gettysburg","Triassic,Upper- Jurassic,Lower","Piedmont-Blue Ridge province,Gettysburg basin","MD,PA","Newark Supergroup",""
"Ghost Dance","Miocene","Great Basin province","NV","Hu-pwi Rhyodacite",""
"Ghost River","Devonian","Western Alberta","AB"
"Gila Conglomerate","Oligocene(?)- Miocene- Pliocene- Pleistocene","Basin and Range province,Pedregosa basin","AZ,NM",""
"Gilbert","Ordovician,Upper","Cincinnati arch","KY","Ashlock Formation",""
"Gile Mountain","Silurian-Devonian,Lower?","New England province","MA,NH,VT"
"Gilmore City Limestone","Mississippian,Lower","Anadarko basin,Iowa shelf","CO (subsurface),IA,KS,MO,NE",""
"Glen Canyon","Jurassic,Lower","Black Mesa basin,Great Basin province,Green River basin,Paradox basin,Piceance basin,Plateau sedimentary province,San Juan basin,Uinta uplift","AZ,CO,NM,NV,UT",""
"Glen Dean Limestone","Mississippian,Upper","Illinois basin,Ozark uplift,Cincinnati arch","IL,IN,KY,MO,TN",""
"Glen Rose Limestone","Cretaceous,Lower","Strawn basin,Fort Worth syncline,Bend arch,Llano uplift,Ouachita folded belt,Kerr basin,Permian basin,Gulf Coast basin","LA,TX","Trinity Group",""
"Glenn Shale","Triassic,Middle to Cretaceous,Lower- Triassic,Middle to Cretaceous,Lower","Alaska East-Central region","AK",""
"Glens Falls Limestone","Ordovician,Middle","New England province,Appalachian basin","NY,VT","Trenton Group",""
"Glens Ferry","Miocene","Idaho Mountains province,Snake River basin","OR?,ID","Payette formation"
"Gog Quartzite","Cambrain,Lower","Rocky Mountains","AB,BC"
"Golden Valley (ND)","Paleocene,Eocene","Williston basin","ND"
"Golden Valley","Cretaceous,Lower","Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt,Arkla basin,Strawn basin","AR,LA?,OK,TX","Golden Valley, Mercer Co., SD",""
"Goodland Limestone","Cretaceous, Lower","Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt,Arkla basin,Strawn basin","AR,LA,OK,TX","Fredricksburg Group"
"Goose Creek Limestone","Pliocene, early- Pliocene, middle","Atlantic Coast basin","GA,NC,SC",""
"Goose Tickle Group","Ordovician,Upper?","Northwestern Newfoundland","NL"
"Gorge","Cambrian,Upper- Ordovician,Lower","New England province","qc,VT",""
"Graford","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX","Canyon Group",""
"Graham","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","OK,TX",""
"Grand Detour","Ordovician,Middle","Wisconsin arch","IA,IL,MO,WI","Platteville Group",""
"Graneros Shale","Cretaceous,Upper","Chadron arch,Denver basin,Iowa shelf,Las Vegas-Raton basin,Powder River basin,San Juan basin,Sierra Grande uplift,Sioux uplift,Williston basin","CO,IA,KS,MN,MT,ND,NE,NM,OK,SD,TX,WY","Colorado Group",""
"Grant Lake Limestone","Ordovician,Upper","Cincinnati arch","KY,OH",""
"Grant Limestone Shale","Permian","Nemaha anticline,Sedgwick basin","KS,NE","Winfield Limestone of Chase Group",""
"Grassy Creek Shale","Devonian,Upper","Iowa shelf,Lincoln anticline,Illinois basin,Ozark uplift","IA,IL,KY,MO","New Albany Group",""
"Grassy Ridge","Triassic",,"OR"
"Gravel Point","Devonian,Middle","Michigan basin","MI",""
"Gray Bull","Eocene",,"WY","Wasatch"
"Gray","","Eagle basin","CO",""
"Grayling","Triassic",,"BC"
"Graylock","Jurassic,Early","Snake River Basin","OR"
"Great Bear Basin","Cretaceous",,"NT"
"Great Blue Limestone","Mississippian, Late","Great basin province","ID,UT"
"Great Meadows","Ordovician,Lower","New Englnd province,Applachian basin","NY,VT"
"Green Canyon","Pennsylvanian,Middle","Basin and Range province,Orogrande basin","AZ?,NM",""
"Green Pond Conglomerate","Silurian,Lower(?)- Silurian, middle(?)","Piedmont-Blue Ridge province","NJ,NY",""
"Green River","Paleocene (local)- Paleocene (local)- Eocene","Green River basin,Piceance basin,Uinta basin,Wasatch uplift","CO,UT,WY",""
"Greenbriar Limestone","Mississippian","Applachian basin","md,VA,WV"
"Greenfield Dolomite","Silurian,Upper","Cincinnati arch,Michigan basin","KY,MI,OH","Bass Islands Group",""
"Greenfields Dolomite","Silurian",,"OH","Bass Island"
"Greenhorn Limestone","Cretaceous,Upper","San Juan basin,Powder River basin,Anadarko basin,Central Kansas uplift,Salina basin,Sierra Grande uplift,Las Animas arch,Williston basin,Denver basin,Iowa shelf,Sioux uplift,Central Montana uplift,Sweetgrass arch","CO,IA,KS,MN,MT,ND,NE,NM,OK,SD,WY","Colorado Group",""
"Greensand","Cretaceous,Upper","Atlantic Coastal basin","DE,NJ","Obsolete term for Upper Cretaceous and Tertiry marine sands in NJ and adajacent areas"
"Grenola Limestone","Permian,Lower","Cherokee basin,Nemaha anticline,Salina basin,Forest City basin,Chautauqua platform","KS,NE,OK","Council Grove Group",""
"Grenville","Proterozoic,Middle","Adirondack uplift","NY",""
"Gries Ranch Conglomerate","Oligocene","Western Columbia basin","OR,WA"
"Groos Quarry","Ordovician,Middle","Michigan basin","MI","Trenton Formation",""
"Gualala","Cretaceous,Upper","California Coast Ranges province","CA",""
"Guelph Dolomite","Silurian- Silurian,Upper","Appalachian basin,Michigan basin","CN,MI,NY,OH,PA,wi","Lockport Group",""
"Gull River","Ordovician,Middle","Appalachian basin","NY,on,qc,PA",""
"Gunflint","Proterozoic,Lower","Sioux uplift","MN,on","Animikie Group",""
"Hackberry (IA)","Devonian,Upper",,"IA"
"Hackberry Shale","Permian","Anadarko basin","KS","(+Hackberry Shale (KS) considered abandoned?  Uncertain if still in use by the KS Geol. Survey.  Abandoned by the USGS.","
"Haida","Jurassic,Upper-Cretaceous,Lower","Queen Charlote Islands","BC","Queen Charlotte Group"
"Hale","Pennsylvanian,Lower- Mississippian,Upper","Arkoma basin","AR,MO,OK",""
"Hamilton","Devonian,Middle","Appalachian basin","ia,MD,mi,NJ,NY,OH,PA,wi,WV",""
"Hampton","Mississippian,Lower","Iowa shelf","IA",,""
"Haney Limestone","Mississippian,Upper","Illinois basin","IL,IN,KY,MO",""
"Hannibal","Mississippian,Lower","Lincoln anticline,Illinois basin,Iowa shelf,Ozark uplift","IA,IL,IN,MO",""
"Haragan Shale","Devonian,Lower","South Oklahoma folded belt","OK(cs)","Hunton Group",""
"Hardgrave Sandstone","Jurassic,Lower","Sierra Nevada province","CA",""
"Harding Sandstone","Ordovician,Middle","Denver basin,Piceance basin,Eagle basin,Las Vegas-Raton basin,South Park basin,San Luis basin","CO,WY",""
"Hardinsburg","Mississippian,Upper","Cincinnati arch,Illinois basin","IL,IN,KY,MO,TN",""
"Harkless","Cambrian,Lower","Great Basin province","CA,NV",""
"Harleyville","Eocene, late","Atlantic Coast basin","SC","Cooper Group",""
"Harmony","Precambrian- Proterozoic,Upper","New England province","RI",""
"Harmony (NV)","Cambrian,Upper","Great Basin Province","NV"
"Harpersville","Pennsylvanian,Upper- Permian,Lower","Bend arch,Llano uplift","TX",""
"Harrison","Miocene,Lower","Denver basin,Chadron arch","ND,NE,SD,WY"
"Harrison (CT)","Ordovician,Middle(?)","New England province","CT,NY",""
"Harrodsburg Limestone","Mississippian,Lower- Mississippian,Upper","Illinois basin,Cincinnati arch","IL,IN,KY,MO",""
"Hart Limestone","Permian","Arkoma basin,South Oklahoma folded belt","OK","Stratford Formation",""
"Hart Mine","Eocene,Middle","South Central, NM","NM"
"Hartford Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Topeka Limestone of Shawnee Group",""
"Haslam","Cretaceous,Upper","Western Columbia basin","bc,WA","Nanaimo Group",""
"Hatch Hill","Cambrian,Upper","New England province","NY,VT",""
"Hatchetigbee","Eocene","Mid-Gulf Coast basin,South Georgia sedimentary province","AL,FL,GA,MS","Wilcox Group",""
"Haven","Pleistocene","Wisconsin arch","WI","Kewaunee Formation",""
"Havensville Limestone Shale","Permian","Nemaha anticline","KS,NE,OK","Wreford Limestone of Chase Group",""
"Hawthorn","Oligocene,Miocene,Pliocene","South Georgia sedimentary province,Florida platform,Atlantic Coast basin","FL,GA,SC"
"Hawthorne","Pleistocene","Adirondack uplift","NY",""
"Hay Creek Coal","Cretaceous,Lower","Powder River basin","WY","(+Hay Creek Coal or +Hay Creek Formation (WY) considered abandoned?  Uncertain if still in use by the WY Geol. Survey.  Not used by the USGS.","
"Hay River","Devonian,Upper",,"NT"
"Haymeadow Creek","Ordovician,Middle","Michigan basin","MI","Trenton Formation",""
"Hayward Sandstone","Permian","Anadarko basin","OK,tx","Garber Sandstone of Enid Group",""
"Hazel Sandstone","Precambrian- Proterozoic,Middle","Southwestern Basin and Range region","TX",""
"Heath","Mississippian,Upper","Central Montana uplift,Powder River basin,Williston basin,Montana folded belt province","MT,ND","Big Snowy Group",""
"Heebner Limestone Shale","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE","Oread Limestone",""
"Helderberg","Silurian,Upper- Devonian,Lower","Appalachian basin","KY,MD,NJ,NY,OH,PA,VA,WV",""
"Hell Creek","Cretaceous,Upper-Paleocene-Lower","Williston basin,Central Montana uplift,Powder River basin","MT,ND,SD"
"Hell Creek (OR)","Eocene","Western Columbia basin","OR",""
"Helmick","Eocene","Western Columbia basin","OR"
"Hemphill","Pliocene",,"tx",
"Hemingford","Miocene, late- Pliocene, early","North America","Nam",""
"Hendricks Sandstone","Devonian,Upper","Appalachian basin","mi,WV,wi",""
"Hennessy Shale","Permian","Anadarko basin,South Oklahoma folded belt","OK"
"Henrietta","Pennsylvanian,Middle","Forest City basin","ia,MO","+Henrietta Formation","(Rocks of +Henrietta Formation (MO) replaced with Marmaton Group","
"Henryhouse Shale","Silurian","South Oklahoma folded belt","OK(cs)","Hunton Group",""
"Herbert River Limestone","Mississippian","Cape Breton Is","NS","Windwor Group"
"Herington Limestone","Permian,Lower- Pennsylvanian,Upper","Nemaha anticline,Salina basin,Anadarko basin","KS,NE,OK","Chase Group",""
"Herkimer (UT) Limestone","Cambrian,Middle","Wasatch uplift,Great Basin province","UT",""
"Herkimer Sandstone","Silurian,Middle","Appalachian basin","NY"
"Hermit","Permian,Lower","Plateau sedimentary province,Salton basin,Great Basin province","AZ,CA,NV,UT",""
"Hermitage","Ordovician,Middle","Appalachian basin,Cincinnati arch","AL,GA,KY,TN",""
"Hermosa","Pennsylvanian,Middle- Pennsylvanian,Upper","Black Mesa basin,Paradox basin,San Juan Mountains province,San Juan basin,Plateau sedimentary province","AZ,CO,NM,UT",""
"Hertha Limestone","Pennsylvanian","Cherokee basin","IA,KS,MO,NE","Kansas City Group",""
"Heumander Shale","Pennsylvanian",,"KS"
"Highgate","Cambrian,Lower","New England province","VT",""
"Hillsborough Bay","Permian","Prince Edward Is","PE"
"Hillsborough River","Permian","Prince Edward Is","PE"
"Hillsdale Limestone","Mississippian,Upper","Appalachian basin","VA,WV","Greeenbier formation"
"Hindsville Limestone","Mississippian,Upper","Chautauqua platform,Arkoma basin","AR,MO,OK",""
"Hoback","Paleocene- Paleocene","Green River basin,Yellowstone province","WY",""
"Hogshooter Limestone","Pennsylvanian,Upper","Chautauqua platform","OK","Skiatook Group",""
"Holdenville Shale","Pennsylvanian,Middle","Chautauqua platform","KS,MO,OK","Marmaton Group",""
"Holder","Pennsylvanian,Upper","Orogrande basin","NM","Magdalena Group",""
"Holland Quarry Shale","Devonian","Michigan basin","OH",""
"Holt Shale","Pennsylvanian,Upper","Forest City basin,Nemaha anticline","IA,KS,MO,NE","Topeka Formation",""
"Honaker Trail","Pennsylvanian,Middle- Pennsylvanian,Upper","Black Mesa basin,San Juan basin,San Juan Mountains province,Paradox basin","AZ,CO,NM,UT","Hermosa Group",""
"Hornbrook","Cretaceous","Klamath Mountains province","CA,OR"
"Hornerstown","Cretaceous,Upper- Paleocene, early- Paleocene, early","Atlantic Coast basin","DE,MD,NJ","Rancocas Group",""
"Horquilla Limestone","Pennsylvanian,Lower- Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower","Pedregosa basin,Basin and Range province","AZ,NM","Naco Group",""
"Horseshoe Canyon","Cretaceous,Middle","Central Alberta","AB"
"Horseshoe","Cretaceous,Upper","Idaho Mountains province","ID",""
"Horsetown","Cretaceous,Lower","Klamath Mountains province","CA",""
"Horton Bluff","Mississippian",,"NS"
"Horton","Precambrian- Proterozoic,Upper","Piedmont-Blue Ridge province","GA,NC","Helen Group",""
"Hosselkus Limestone","Triassic, Upper","Sierra Nevada province, Klamath Mountains province","CA",
"House Limestone","Ordovician,Lower","Great Basin province","NV,UT","Pogonip Group"
"Howell Limestone","Cambrian,Middle","Great Basin province","UT"
"Hoyt Dolomite","Cambrian,Upper","New England province","NY,VT",""
"Hudson River","Paleozoic,Lower","Hudson River Valley","in,mn,NY,wi","19th Century term for Taconic -- Cambrian and Ordoviciansediments in New York"
"Hudson Sandstone","Cambrian,Upper","Wisconsin arch","in,WI","Franconia Sandstone",""
"Hudspeth","Cretaceous","Blue Mountains province","OR",""
"Hueco","Permian,Lower","Orogrande basin,Permian basin","NM,TX",""
"Huerfano","Eocene","Las Vegas-Raton basin","CO,NM?",""
"Hughes Creek Shale","Permian, Lower","Forest City basin","KS,NE,ok","Hughes Creek Shale Member* of Elmdale Shale Member of Wabaunsee Formation"
"Hungry Hollow","Devonian,Middle","Michigan basin","MI,ON","Elmdale Shale Member of Wabaunsee Formation<br/>
"Hunsaker Creek","Permian,Lower","Snake River basin,Idaho Mountains province","ID,OR"
"Hunter Creek","Miocene","Snake River basin","OR,nv",""
"Huntersville","Devonian,Lower- Devonian,Middle","Appalachian basin","KY,MD,NY,OH,PA,TN,VA,WV",""
"Huntington (Canada)","Eocene","Vancouver Is?","BC"
"Huntington Dolomite","Silurian, middle","Cincinnati arch","IN,OH","+Huntington Dolomite","(Rocks of +Huntington Dolomite (IN*,OH) reallocated to Salamonie Dolomite.  See Salamonie.","
"Huntsville","Pliocene","Wasatch uplift","UT",""
"Huron Shale","Devonian,Upper","Appalachian basin","AL,GA,IN,KY,OH,PA,TN,VA,WV","Gassaway Member of Chattanooga Shale",""
"Hurwal","Triassic,Upper-Jurassic,Lower","Eastern Columbia basin","ID?,OR"
"Hushpuckney Limestone Shale","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Swope Limestone",""
"Hygiene Sandstone Shale","Cretaceous,Upper","Denver basin","CO,WY","Pierre Shale",""
"Iatan","Mississippian- Pennsylvanian(?)","Arkoma basin","AR",""
"Iatan (TX)","Triassic","Permian basin","ne,TX"
"Imo","Mississippian-Pennsylvanian?","Arkoma basin","AR"
"Imperial","Miocene, late to Pliocene, late(?)- Miocene, late to Pliocene, late(?)","Salton basin","CA",""
"Independence Shale","Devonian,Upper","Iowa shelf","IA",""
"Indian Meadows","Eocene, early","Wind River basin","WY",""
"Indian River","Ordovician,Middle","New England province","NY,VT",""
"Indian Springs (IN) Shale","Mississippian,Upper","Illinois basin","IL,IN,KY,MO",""
"Indian Springs","Mississippian,Upper","Great Basin province","NV"
"Inglis","Eocene, late","South Georgia sedimentary province,Florida platform","FL","Ocala Group",""
"Interlake","Ordovician,Upper- Silurian","Powder River basin,Williston basin","mb,MT,ND,SD,WY",""
"Ipperwash Limestone","Devonian,Middle","Lake Huron basin","ON"
"Irondequoit Limestone","Silurian,Lower","Appalachain basin","NY","Clinton Group"
"Ironside","Pliocene","Snake River basin","OR"
"Ithaca","Devonian,Upper","Appalachian basin","NY","Genesee Formation",""
"Iuka","Mississippian,Lower","Black Warrior basin","AL,MS",""
"Jacksboro Limestone","Pennsylvanian,Upper","Fort Worth syncline,Bend arch","TX","","(+Jacksboro Formation (TX) replaced with Jacksboro Limestone Member of Graham Formation of Cisco Group.  See other Jacksboro.","
"Jackson Bluff","Miocene, middle- Miocene, late- Pliocene- Pleistocene(?)","Florida platform","FL",""
"Jackson","Eocene, late","Mid-Gulf Coast basin,Gulf Coast basin,Arkla basin,Upper Mississippi embayment,Desha basin","AL,AR,fl,ga,KY,LA,MO,MS,TN,TX",""
"Jacksonburg","Ordovician,Middle","Appalachian basin","NJ,PA",""
"James City","Pliocene, late- Pleistocene, early","Atlantic Coast basin","NC",""
"Jamesville","Devonian,Lower","Applachian basin","NY"
"Jamestown","Cambrian,Middle","New England province","RI","Conanicut Group",""
"Javelina","Cretaceous,Upper","Permian basin","TX","Tornillo Group",""
"Jefferson City Dolomite","Ordovician,Lower","Ozark uplift,Illinois basin,Upper Mississippi embayment,Cherokee basin,Chautauqua platform,Salina basin,Central Kansas uplift,Forest City basin,Nemaha anticline,Anadarko basin,Arkoma basin","AR,IL,KS (subsurface),MO,OK",""
"Jefferson Dolomite","Devonian,Middle (local)- Devonian,Upper","Idaho Mountains province,Montana folded belt province,Wasatch uplift,Sweetgrass arch,Williston basin,Central Montana uplift,Yellowstone province,Big Horn basin,Powder River basin,Great Basin province,Snake River basin,Green River basin","ID,MT,ND,SD,UT,WY",""
"Jeffersonville Limestone","Devonian,Lower- Devonian,Middle","Cincinnati arch","IN,KY",""
"Jemison","Devonian,Lower- Devonian,Middle","Appalachian basin,Piedmont-Blue Ridge province","AL","the Talladega Group",""
"Joggins","Pennsylvanian","Fundy Basin","NS"
"John Day","Miocene- Oligocene- Eocene","Eastern Columbia basin","OR",""
"Jordan","Cambrian,Upper- Ordovician,Lower","Wisconsin arch,Sioux uplift,Iowa shelf,Michigan basin,Lincoln anticline","IA,IL,MI,MN,MO,WI",""
"Joslin Hill","Silurian, Upper","Appalachain basin","NY","Herkimer formation"
"Judith Fancy","Cretaceous,Upper","Caribbean region","VI","Mount Eagle Group",""
"Judith River Sandstone Shale","Cretaceous,Upper","Sweetgrass arch,Central Montana uplift,Williston basin","ab,MT,SD,sk,WY"
"Juniper Hill","Devonian,Upper","Iowa shelf","IA","Juniper Hill Shale Member of Lime Creek Formation"
"Juntura","Miocene","Snake River basin","OR"
"Jupiter","Precambrian- Proterozoic,Upper- Proterozoic Y","Southern Rocky Mountain region,Plateau sedimentary province","AZ","Galeros Formation of Chuar Group of Grand Canyon Supergroup",""
"Jupiter (QC)","Silurian",,"qc"
"Kaibab Limestone","Permian,Lower","Plateau sedimentary province,Black Mesa basin,Paradox basin,Salton basin,Basin and Range province,Great Basin province","AZ,CA,NV,UT",""
"Kalkberg Limestone","Devonian,Lower","Appalachian basin","NJ,NY,PA","Helderberg Group",""
"Kamloops Group","Eocene",,"BC"
"Kanawha","Pennsylvanian,Middle","Appalachain basin","AL?,VA,WV"
"Kansas City","Pennsylvanian,Upper","Forest City basin,Anadarko basin","CO (subsurface),IA,KS,MO,NE,OK,TX",""
"Karen Creek Sandstone","Triassic,Upper","Alaska Northern region","AK",""
"Kashong Shale","Devonian,Middle","Appalachian basin","NY","Hamilton Group",""
"Kaskapau","Cretaceous,Upper","Alberta trough","AB,BC","Smoky River Group",""
"Kasota Sandstone","Ordovician,Lower","Sioux uplift","MN",""
"Kayenta","Triassic,Upper-Jurassic,Lower","Paradox basin,Plateau sedimentary province,Black Mesa basin,San Juan basin,Great Basin province","AZ,CO,NV,UT"
"Keasey","Oligocene- Eocene","Western Columbia basin","OR,WA",""
"Keechi Creek Shale","Pennsylvanian,Middle","Bend arch","TX","Mineral Wells Formation",""
"Keefer","Silurian, middle","Appalachian basin","KY,MD,OH,PA,VA,WV",""
"Keeler Creek Shale","Jurassic",,"OR","No citations"
"Keim","Pleistocene- Pliocene","Salina basin","NE",""
"Kelly Limestone","Mississippian,Lower- Mississippian,Upper","Orogrande basin,Pedregosa basin,Basin and Range province","NM",""
"Kempsville","Pleistocene, late","Atlantic Coast basin","VA",""
"Kenai (Alaska)","Tertiary",,"AK"
"Kenai","Pennsylvanian,Middle","Appalachian basin","KY,TN,VA",""
"Kendrick Shale","Pennsylvanian,Upper","Appalachian basin","KY,TN,VA"
"Kennetcook","Mississippian",,"NS"
"Kennett","Devonian,Lower(?)- Devonian,Middle","Klamath Mountains province","CA",""
"Keokuk Limestone","Mississippian,Lower","Iowa shelf,Anadarko basin,Illinois basin,Ozark uplift","CO (subsurface),IA,IL,in,KS,KY,MO,NE,OK,TN",""
"Kereford Limestone","Pennsylvanian,Upper","Forest City basin,Nemaha anticline","IA?,KS,MO,NE","Oread Limestone of Shawnee Group",""
"Kessler Limestone Shale","Pennsylvanian","Arkoma basin","AR,OK","Bloyd Shale",""
"Keyser","Silurian,Upper- Devonian,Lower","Appalachian basin","MD,PA,VA,WV",""
"Kiewitz shale","Pennsylvanian,Upper","Nemaha anticline","ky,NE"
"Kildare Capes","Permian","Prince Edward Island","PE"
"Killdeer","Oligocene",,"ND"
"Kimmswick","Ordovician,Middle","Illinois basin,Ozark uplift,Upper Mississippi embayment","AR,IA,IL,KS,MO,TX",""
"Kinderhook Group","Mississippian",,"IA,IL"
"King Hill Shale","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE"
"Kings Falls Limestone","Ordovician,Middle","Appalachian basin","NY,on",
"Kinnick","Miocene, middle","Sierra Nevada province","CA",""
"Kinzers","Cambrian,Lower- Cambrian,Middle","Piedmont-Blue Ridge province","MD,PA,VA",""
"Kiowa Shale","Cretaceous,Lower","Anadarko basin","CO,KS,NM?,OK",""
"Kirkland Limestone","Silurian, middle","Appalachian basin","nj,NY","Clinton Group",""
"Kirkwood","Miocene, early","Atlantic Coast basin","DE,MD,NJ,PA",""
"Kirtland Shale","Paleocene- Paleocene- Cretaceous,Upper","San Juan basin","CO,NM",""
"Kitsilano","Eocene","SW British Columbia","BC"
"Kittanning Coal","Pennsylvanian,Upper","Appalachian basin","PA","Allegheny Group",""
"Kittatinny Limestone","Cambrian- Ordovician,Lower- Ordovician,Middle","Appalachian basin","NJ,PA",""
"Klondike Limestone","Devonian,Middle","Appalachian basin","OH","Columbus Limestone",""
"Klondike Mountain","Eocene","Bellingham basin","WA"
"Knight","Eocene","Uinta uplift,Green River basin","UT,WY",""
"Knox Dolomite","Cambrian,Upper- Ordovician,Lower- Ordovician,Middle(?)","Appalachian basin,Illinois basin,Black Warrior basin","AL,GA,IL,IN,KY,MS,OH,TN,VA,WV",""
"Knoxville","Cretaceous,Lower- Jurassic,Upper","Northern Coast Range province","CA",""
"Knoydart","Devonian,Lower","Arisaig area","NS"
"Kokomo Limestone","Silurian,Upper","Cincinnati arch","IN",""
"Kootenai","Cretaceous,Lower","Big Horn basin,Yellowstone province,Snake River basin,Montana folded belt province,Sweetgrass arch,Central Montana uplift,Powder River basin","ID,MT",""
"Kootenay","Jurassic,Upper-Cretaceous,Lower","Crowsnest Pass area","AB"
"Kope","Ordovician,Middle- Ordovician,Upper","Cincinnati arch","IN,KY,OH",""
"La Barge Shale","Eocene,Middle-Eocene,Upper","Green River basin","WY","La Barge Member* of Wasatch Formation"
"La Biche","Cretaceous","Eastern Alberta","AB"
"La Butte","Devonian",,"AB"
"LaVale Limestone","Silurian,Upper- Devonian,Lower","Appalachian basin","MD,PA,VA,WV","Keyser Limestone",""
"Labette Shale","Pennsylvanian,Middle","Chautauqua platform","IA,OK","Labette Shale* of Marmaton Group"
"Lake Creek","Cretaceous,Upper","Anadarko basin","KS","Lake Creek member of Pierre Shale"
"Lake Louise","Cambrian,Lower","Canadian Rockies","AB"
"Lake Valley Limestone","Mississippian,Lower","Basin and Range province,Orogrande basin,Pedregosa basin","NM,TX?",""
"Laketown Dolomite","Silurian","Great Basin province,Idaho Mountains province,Green River basin,Snake River basin,Wasatch uplift","ID,UT,WY"
"Lakeview (ID) Limestone","Cambrian, Middle","Idaho Mountains province","ID"
"Lakeview Shale","Devonian,Middle","Appalachian basin","NY","/Darien Center submember [informal] of Wanakah Shale Member of Ludlowville Formation",""
"Lakota Sandstone Limestone Shale","Cretaceous,Lower","Chadron arch,Williston basin,Powder River basin","NE,SD,WY",""Basal formation of Inyan Kara Group"
"Lambert (Canada)","Cretaceous","Vancouver Is?","BC"
"Lambert Shale","Miocene- Oligocene","Coastal basins","CA",
"Laney","Eocene,Middle","Green River Basin","CO,WY"
"Lance","Cretaceous,Upper-Paleocene,Lower","Powder River basin,Green River basin,Wind River basin,Big Horn basin","MT,sd,WY"
"Lance (PA)","Silurian,Upper","Appalachian basin","PA",""
"Landisburg Sandstone","Silurian,Upper","Appalachian basin","PA"
"Lane Shale","Pennsylvanian","Forest City basin","IA,KS,MO,NE","Kansas City Group",""
"Laney","Eocene, early middle","Green River basin","CO,WY","Green River Formation",""
"Langston","Cambrian,Middle","Wasatch uplift,Great Basin province","ID,UT",""
"Lansing","Pennsylvanian,Upper","Forest City basin,Anadarko basin","CO (subsurface),IA,KS,MO,NE,ok",""
"Larabee","Ordovician,Middle","New England Province","NY,VT"
"Laramie","Cretaceous,Upper","Denver basin","CO,wy",""
"Laredo","Eocene,Middle","Gulf Coast basin","TX"
"Lasalle Limestone","Pennsylvanian,Upper","Wisconsin arch","IL"
"Latah","Miocene","Eastern Columbia basin","ID,WA",""
"Latham Shale","Cambrian,Lower","Mojave basin","CA",""
"Latrania","Pliocene- Miocene","Salton basin","CA","Imperial Formation",""
"Lauderdale Chert","Mississippian,Upper","NW Alabama","AL"
"Laurel Dolomite","Silurian- Silurian, middle","Cincinnati arch","IN,KY,MO,OH,TN",""
"Lavender Shale","Mississippian,Lower","Appalachian basin","GA","Fort Payne Chert",""
"Laval","Ordivician,Lower Middle","SouthEast Ontario,SouthWest Quebec","ON,QC"
"Leadville Limestone","Mississippian,Lower- Mississippian,Upper (local)","South Park basin,Eagle basin,San Juan Mountains province,San Juan basin,Black Mesa basin,San Luis basin,Green River basin,Denver basin,Piceance basin,Uinta basin,Las Vegas-Raton basin","AZ,CO,NM,UT",""
"Lebanon Limestone","Ordovician,Middle","Appalachian basin,Cincinnati arch","GA,TN","Stones River Group",""
"Lebo Limestone Shale","Paleocene","Williston basin,Central Montana uplift,Powder River basin","MT,WY","Fort Union Group"
"Lecompton Limestone","Pennsylvanian,Upper","Forest City basin,Nemaha anticline","IA,KS,MO,NE,OK","Shawnee Group"
"Leda Clay","Holocene","St Lawrence basin,Champlain Valley","ma,me,ON,QC,VT"
"Ledyard Shale","Devonian,Middle","Appalachian basin","NY","Ludlowville Formation",""
"Leipers Limestone","Ordovician,Upper","Cincinnati arch,Appalachian basin","AL,GA,KY,TN",""
"Lenoir Limestone","Ordovician,Middle","Appalachian basin","AL,GA,TN,VA",""
"Leonard","Permian,Lower","Permian basin","TX","(+Leonard Formation (TX*) abandoned as lithostratigraphic term.  Now Leonardian Series.","
"Levis","Cambrian,Upper","St Lawrence Valley","QC"
"Lexington Limestone","Ordovician,Middle- Ordovician,Upper","Cincinnati arch","IN,KY,OH",""
"Liberty Hall","Ordovician,Middle","Appalachian basin","VA",""
"Liberty Limestone","Ordovician,Upper","Cincinnati arch","IN,ky,OH",""
"Lignite Creek","Miocene, middle- Miocene, late","Alaska East-Central region,Alaska Southern region","AK","Usibelli Group",""
"Lilley","Silurian, middle","Cincinnati arch","OH",""
"Lime Creek Shale","Devonian,Upper","Iowa shelf","IA",""
"Lime Island Dolomite","Silurian, middle","Michigan basin","MI","Burnt Bluff Group",""
"Limestone Gap Shale","Pennsylvanian,Lower","Ouachita folded belt","OK"
"Lincoln Creek","Eocene,Upper-Miocene","Puget Sound province,Oregon-Washington Coast Ranges province","WA"
"Lindsay","Ordovician,Middle","Appalachian basin","on,PA",""
"Lisburne","Mississippian,Lower- Mississippian,Upper- Pennsylvanian- Permian,Lower","Alaska Northern region","AK",""
"Liston Creek","Silurian, middle- Silurian,Upper","Cincinnati arch","IN",""
"Little Butte Volcanics","Oligocene- Miocene, early","Cascades province","CA,OR",""
"Little East Lake","Ordovician,Upper","New England province","ME"
"Littleton","Devonian,Lower","New England province","CT,MA,ME,NH,VT",""
"Livermore","Pleistocene- Pliocene","Sacramento basin","CA",""
"Livingston Conglomerate","Pennsylvanian,Lower","Appalachian basin","KY","Lee Formation",""
"Livingstone","Carboniferous","Alberta trough","ab,MT","Rundle Group",""
"Llajas","Eocene","Ventura basin","CA",""
"Llewellyn","Pennsylvanian,Middle- Pennsylvanian,Upper","Appalachian basin","PA",""
"Lobelville","Silurian- Silurian, middle","Cincinnati arch","TN","Brownsport Group",""
"Lock Haven","Devonian,Upper","Appalachian basin","PA","Susquehanna Group",""
"Lockatong","Triassic,Upper","Piedmont-Blue Ridge province,Newark basin","ct,NJ,PA","Newark Supergroup",""
"Lockport Dolomite","Silurian- Silurian,Lower- Silurian, middle- Silurian,Upper","Appalachian basin,Michigan basin","KY,MI,NY,OH,on,PA,WV",""
"Lodgepole Limestone","Mississippian,Lower","Central Montana uplift,Powder River basin,Sweetgrass arch,Williston basin,Yellowstone province,Montana folded belt province,Snake River basin,Great Basin province,Wasatch uplift,Uinta uplift","ID,MT,ND,SD,UT,WY","Madison Group",""
"Lodi","Cambrian,Upper","Wisconsin arch","IA,MI,MN,WI","St. Lawrence Formation",""
"Lodore","Cambrian,Upper","Green River basin,Uinta basin,Uinta uplift","CO,UT,WY",""
"Logan","Mississippian,Lower","Appalachian basin","OH,WV",""
"Logansport Limestone","Devonian,Middle","Cincinnati arch","IN",""
"Logansport (LA)","Paleocene","Arkla basin","LA,TX","Midway Group"
"Lone Pine (CA)","Permian","Great Basin Province","CA"
"Lone Pine","Pleistocene","Salina basin","NE","",""
"Lonesome","Jurassic,Middle","Snake River basin","OR"
"Long Branch","Eocene","Atlantic Coast basin","NJ","(+Long Branch Sand (NJ) considered obsolete.","
"Long Pine","Pleistocene","Salina Basin","NE"
"Long Point (NL)","Ordovician",,"NL"
"Long Point","Eocene","Uinta basin,Piceance basin","CO,UT","Garden Gulch Member of Green River Formation",""
"Long Rapids","Upper,Devonian","James Bay Lowlands","ON"
"Longarm","Proterozoic,Upper","Appalachian basin,Piedmont-Blue Ridge province","NC,TN"
"Longarm (Canada)","Cretaceous,Lower","Queen Charlotte Is","BC"
"Longmeadow","Jurassic,Lower","Deerfield basin,Hartford basin","MA"
"Lookingglass","Eocene,Lower-Lower,Middle","Klamath Mountains province, Oregon-Washington Coast Ranges province","OR"
"Lorraine","Ordovician,Upper","Appalachian basin,Michigan basin","NY",""
"Lost Burro","Devonian,Upper- Devonian,Middle","Great Basin province","CA",""
"Lost Cabin","Eocene,Lower","Wind River basin","WY","Wind River Formation
"Lost City","Pennsylvanian,Upper","Chautauqua platform","OK","Coffeeville Formation",""
"Louisiana","Devonian,Upper","Lincoln anticline,Illinois basin,Iowa shelf","IA,IL,MO","Sulphur Springs Group,New Albany Group"
"Louisville Limestone","Silurian, middle","Cincinnati arch","IN,KY",""
"Loup Fork","Miocene,Upper",,"SD"
"Loup Loup Grandiorite","","Northern Cascade Range-Okanagan province","WA",""
"Lowell","Cretaceous,Lower","Pedregosa basin","AZ","Bisbee Group",""
"Lowville","Ordovician,Middle","Appalachian basin,New England province,Adirondack uplift","MD,NY,PA,tn,VA,VT,WV","Lowville Limestone of Black River Group"
"Lucas","Devonian,Middle","Michigan basin","MI,OH","Detroit River Group",""
"Ludlowville","Devonian,Middle","Appalachian basin","MD,NY,OH,PA,WV","Hamilton Group",""
"Lueders Limestone","Permian,Lower","Bend arch,Palo Duro basin,Permian basin","TX","Wichita Group",""
"Luning","Triassic,Upper","Great Basin province","NV",""
"Luscar Sandstone","Cretaceous,Lower",,"AB"
"Lynx Limestone","Cambrian,Upper","Rocky Mountains","AB"
"Lynx Creek","Precambrian- Proterozoic,Lower","Basin-and-Range province","AZ","Bradshaw Mountains Group of Yavapai Supergroup",""
"Lysite","Eocene,Lower","Wind River basin","WY","Lysite Member of Wind River Formation"
"Ma Butte","Cretaceous,Lower",,"AB"
"Mableton","Precambrian- Proterozoic,Upper- Cambrian- Ordovician,Lower(?)","Piedmont-Blue Ridge province","GA","Mableton Amphibolite Member of Powers Ferry Formation"
"Madera","Precambrian- Proterozoic,Lower or Proterozoic,Middle","Southwestern Basin and Range region","AZ,co",""
"Madera (NM)","Pennsylvanian,Middle-Permian","Estancia basin,Las Vegas-Raton basin,Orogrande basin,Palo Duro basin,San Juan basin","NM"
"Madison Limestone","Devonian,Upper (local)- Mississippian,Lower- Mississippian,Upper","Great Basin province,Sweetgrass arch,Montana folded belt province,Piceance basin,Wasatch uplift,Denver basin,Big Horn basin,Powder River basin,Wind River basin,Green River basin,Yellowstone province","CO,ID,MT,ND,NE,SD,UT,WY",""
"Madison Valley","Pliocene- Miocene","Montana folded belt province","MT",""
"Magothy","Cretaceous,Upper","Atlantic Coast basin","DC,DE,MA,MD,NJ,NY,PA",""
"Mahantango","Devonian,Middle","Appalachian basin","MD,PA,VA,WV",""
"Mahoning Sandstone","Pennsylvanian,Upper","Appalachian basin","MD,OH,PA,WV","Glenshaw Formation",""
"Main Street Limestone","Cretaceous,Lower","Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt,Strawn basin","OK,TX","Washita Group,Georgetown Limestone,Denison Formation",
"Maligne","Devonian,Upper","Saskatchewan Gap","AB"
"Malone","Jurassic,Upper","Permian basin","TX"
"Manasquan Greensand","Paleocene,upper-Eocene,Lower","Atlantic Coast basin","NJ","Rancocas Group"
"Mancos Shale","Cretaceous,Lower (local)- Cretaceous,Upper","Basin and Range province,Black Mesa basin,Estancia basin,Green River basin,Orogrande basin,Paradox basin,Piceance basin,Plateau sedimentary province,San Juan basin,San Juan Mountains province,Uinta basin","AZ,CO,NM,UT,WY",""
"Manistique Dolomite","Silurian, middle","Michigan basin","MI,WI",""
"Manitou Dolomite","Ordovician,Lower","Denver basin,Eagle basin,Piceance basin,Las Animas arch,South Park basin","CO",""
"Manitoulin Dolomite","Silurian,Lower","Michigan basin","IN,MI,NY,OH,PA","Cataract Group",""
"Manix","Pleistocene, late","Mojave basin","CA",""
"Manlius limestone","Devonian,Lower","Appalachian basin","NY,NJ,PA"
"Manning Canyon Shale","Mississippian,Upper- Pennsylvanian,Lower- Pennsylvanian,Middle","Great Basin province,Wasatch uplift","ID,UT",""
"Manti Shale","Eocene",,"UT"
"Manuels River","Cambrian,Middle",,"NB,NL"
"Maple Mill Shale","Devonian,Upper","Iowa shelf","IA","Yellow Spring Group",""
"Mapleton Sandstone","Devonian,Middle","New England province","ME"
"Maquoketa Shale","Ordovician,Upper","Illinois basin,Iowa shelf,Ozark uplift,Upper Mississippi embayment,Wisconsin arch,Forest City basin","IA,IL,IN,KS (subsurface),KY,MN,MO,OH,WI",""
"Marathon","Pleistocene","Wisconsin arch","WI",""
"Marathon (TX)","Ordovician,Lower","Permian basin","TX"
"Marble Falls Limestone","Pennsylvanian,Lower-Pennsylvanian,Middle","Llano uplift","TX","Bend Group"
"Marble Hill","Ordovician,Upper","Cincinnati arch","IN,KY","Marble Hill Bed of Rowland Member of Drakes Formation"
"Marcellus","Devonian,Middle","Appalachian basin","KY,MD,NJ,NY,OH,PA,TN,VA,WV",""
"March Point","Cambrian,Middle","Western Newfoundland","NL"
"March","Ordovician,Lower","Appalachian basin","NY",""
"Marianna","Oligocene, early","Mid-Gulf Coast basin,South Georgia sedimentary province","AL,FL,GA,LA,MS",""
"Mariposa Slate","Jurassic,Upper","Sierra Nevada province","CA",""
"Marjum","Cambrian,Middle","Great Basin province","UT",""
"Markley","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX"
"Marks Head","Miocene, early","Atlantic Coast basin,South Georgia sedimentary province,Florida platform","FL,GA,SC",""
"Marlboro Clay","Paleocene, late- Paleocene, late- Eocene, early","Atlantic Coast basin","DC,MD,VA","Pamunkey Group",""
"Marlbrook Marl","Cretaceous,Upper","Arkla basin,East Texas basin,Ouachita folded belt","AR,LA,TX",""
"Marshall","Mississippian,Lower","Michigan basin","MI",""
"Marshalltown","Cretaceous,Upper","Atlantic Coast basin","DE,MD,NJ","Matawan Group",""
"Marsland","Miocene, early","Denver basin","NE,WY",""
"Marthaville","Eocene- Paleocene- Paleocene","Arkla basin","LA,TX","Wilcox Group",""
"Martin Bridge","Triassic,Upper","Snake River basin,Idaho Mountains province,Eastern Columbia basin","ID,OR,WA",""
"Martin","Devonian,Middle- Devonian,Upper","Pedregosa basin,Basin and Range province,Plateau sedimentary province,Black Mesa basin","AZ,CA?",""
"Martinez (California)","Eocene, Middle",,"CA"
"Martinez","Ordovician,Middle- Ordovician,Upper","Appalachian basin","MD,NJ,NY,PA,TN,VA,WV","town of Martinez, Contra Costa Co, CA",""
"Martinsburg","Ordovician,Middle","Appalachain basin","MD,NJ,NY,PA,TN,VA,WV"
"Maryville Limestone","Cambrian,Middle- Cambrian,Upper","Appalachian basin","AL,GA,KY,TN,VA,WV","Conasauga Group",""
"Mascall","Miocene","Snake River basin","OR",""
"Matawan Micaceous Sands","Cretaceous,Upper","Atlantic Coast basin","DE,MD,NJ,NY",""
"Matfield Sandstone Limestone Shale","Permian,Lower","Nemaha anticline","KS,NE"
"Matilija Sandstone","Eocene","Ventura basin","CA","Chase Group
"Mauch Chunk","Mississippian,Upper- Pennsylvanian,Lower","Appalachian basin","MD,PA,VA,WV",""
"Maury","Mississippian,Lower","Cincinnati arch,Appalachian basin","AL,GA,TN",""
"Maxville Limestone","Mississippian,Upper","Appalachian basin","al,OH",""
"Maynes Creek","Mississippian,Lower","Iowa shelf","IA",""
"Maysville","Ordovician,Upper","Cincinnati arch","IN,KY,OH"
"Mazon Creek","Pennsylvanian,Upper","Illinois basin","IL"
"Mazourka","Ordovician,Middle- Ordovician,Lower","Great Basin province","CA",""
"McBean","Eocene, middle","South Georgia sedimentary province,Atlantic Coast basin","GA,SC",""
"McCoy","Pennsylvanian","Eagle basin,Green River basin","CO(cw)","(+McCoy Formation (CO) replaced with Minturn Formation.  See Minturn.","
"McManus","Precambrian- Proterozoic,Upper- Cambrian","Piedmont-Blue Ridge province","NC","Albemarle Group",""
"McMicken","Ordovician,Upper","Cincinnati arch","OH",""
"McMillan","Ordovician,Upper","Cincinnati arch","OH",""
"Mcaras Brook","Devonian,Upper","Nova Scotia","NS"
"Mccoy Brook","Jurassic,Lower","Fundy basin","NS"
"Mecca Quarry Shale","Pennsylvanian,Middle","Illinois basin","IL,IN","Linton Formation",""
"Meeteetse","Cretaceous,Upper","Wind River basin,Big Horn basin","WY"
"Menard","Mississippian,Upper","Illinois basin","IL,IN,KY",""
"Menefee","Cretaceous,Upper","Paradox basin,San Juan basin","CO,NM","Mesaverde Group",""
"Merced","Pleistocene- Pliocene","San Joaquin basin","CA",""
"Mercer Shale","Pennsylvanian,Lower","Appalachian basin","oh,PA","Pottsville Formation",""
"Merchantville","Cretaceous,Upper","Atlantic Coast basin","DE,MD,NJ","Matawan Group",""
"Merriam Limestone","Pennsylvanian,Upper","Forest City basin","KS,MO,NE","Plattsburg Limestone",""
"Mesa","Pliocene- Miocene","Great Basin province","NV,OR",""
"Mesaverde","Cretaceous,Upper","Yellowstone province,Orogrande basin,San Juan basin,Wind River basin,Paradox basin,Green River basin,Big Horn basin,Black Mesa basin,Powder River basin,Piceance basin,Uinta basin,Eagle basin","AZ,CO,ID,MT,NM,UT,WY",""
"Metaline","Cambrian,Middle-Ordovician,Middle","Northern Cascade Range-Okanagan province","WA"
"Miamitown Shale","Ordovician,Upper","Cincinnati arch","IN,KY,OH","Fairview Formation",""
"Michelle","Devonian,Lower","Northern Yukon Territory","YT"
"Middendorf","Cretaceous,Upper","Atlantic Coast basin,South Georgia sedimentary province","GA,NC,SC",""
"Middlegate","Miocene","Great Basin province","NV"
"Midway","Paleocene- Paleocene","East Texas basin,Arkla basin,Ouachita folded belt,Gulf Coast basin,Black Warrior basin,Mid-Gulf Coast basin,Upper Mississippi embayment","AL,AR,FL,GA,IL,KY,LA,MO,MS,TN,TX",""
"Miette","Proterozoic,Upper",,"AB,BC"
"Mifflintown","Silurian, middle","Appalachian basin","MD,PA,VA,WV",""
"Mikkwa","Devonian,Upper","Northern Alberta","AB"
"Milk Creek Limestone","Miocene,Upper-Pliocene","Basin and Range province","AZ"
"Milk River","Cretaceous,Upper",,"AB"
"Mill Creek Limestone","Pennsylvanian","Appalachian basin","PA","",
"Millerton","Pleistocene","Santa Cruz basin","CA",""
"Milliken Sandstone","Cretaceous,Upper","Denver basin","CO","Fox Hills Formation",""
"Millsap Lake","Pennsylvanian,Middle","Bend arch,South Oklahoma folded belt,Fort Worth syncline","OK,TX","Strawn Group",""
"Millwood","Cretaceous",,"MB"
"Miminegash","Permian","Prince Edward Is","PE"
"Mineola","Devonian,Middle",,"MO","Mineola member of the Callaway formation"
"Mineral Wells","Pennsylvanian,Middle","Bend arch,Strawn basin","TX",""
"Minnelusa","Pennsylvanian- Permian,Lower","Williston basin,Chadron arch,Denver basin,Powder River basin","SD,WY"
"Minnewanka Limestone","Devonian,Upper",,"AB"
"Mint Canyon","Miocene","Ventura basin","CA"
"Mint Spring","Oligocene, early","Mid-Gulf Coast basin","AL,MS","Vicksburg Group"
"Minturn","Pennsylvanian,Middle","Las Vegas-Raton basin,Eagle basin,San Luis basin,Piceance basin,Denver basin","CO",""
"Missessinewa","Silurian",,"IN"
"Mission Canyon","Mississippian","Central Montana uplift,Powder River basin,Yellowstone province,Montana folded belt province,Sweetgrass arch,Williston basin,Wasatch uplift","ID,MT,ND,SD,WY"
"Mission Valley","Eocene, middle","Peninsular Ranges province","CA","Poway Group",""
"Missourian","Carboniferous",,"nm","Faunal Stage"
"Modelo","Miocene","Ventura basin","CA",""
"Moenave","Triassic,Upper(?)- Jurassic,Lower","Plateau sedimentary province,Great Basin province,Black Mesa basin,Paradox basin","AZ,NV,UT","Glen Canyon Group",""
"Moenkopi","Triassic,Lower- Triassic,Middle(?)","Paradox basin,Piceance basin,Uinta basin,Plateau sedimentary province,Black Mesa basin,San Juan basin,Green River basin,Great Basin province,Palo Duro basin,Las Vegas-Raton basin,Orogrande basin","AZ,CA,CO,NM,NV,UT",""
"Mojave","Miocene","Mojave basin","CA","informal name?"
"Mojave River","Pliocene- Pleistocene","Mojave basin","CA",""
"Monkton","Cambrian,Lower- Cambrian,Middle","New England province","VT",""
"Monmouth","Cretaceous,Upper","Atlantic Coast basin","DC,DE,MD,NJ,NY,PA",""
"Monroe","Silurian","Southern Michigan,New Jersey","MI,nj"
"Monroe Canyon Limestone","Mississippian,Upper","Snake River basin,Wasatch uplift","ID,UT","Chesterfield Range Group",""
"Monroe Creek Sandstone","Miocene","Chadron arch","NE,SD,wy","Arikaree Group",""
"Montanan","Cretaceous",,"wy","Montanan Group"
"Monte Cristo Limestone","Mississippian,Lower- Mississippian,Upper","Plateau sedimentary province,Great Basin province,Mojave basin","AZ,CA,NV,UT",""
"Monte de Oro","Jurassic,Upper","Sacramento basin","CA"
"Montenegro","Cambrian,Lower","Great Basin province","CA,NV","Campito Formation",""
"Monterey","Pliocene[?]- Miocene","California Coast Ranges province,Sacramento basin,San Joaquin basin,Santa Cruz basin","CA",""
"Montevallo","Cambrian,Lower- Cambrian,Middle- Cambrian,Upper","Appalachian basin,Black Warrior basin","AL,GA,KY,MS,NC,OH,TN,VA,WV","=Rome formation""
"Montgomery","Pleistocene","Arkla basin,Gulf Coast basin","LA,TX",""
"Montgomery (California) Limestone","Silurian,Lower","Sierra Nevada province","CA"
"Montoya","Ordovician,Middle- Ordovician,Upper","Permian basin,Orogrande basin,Pedregosa basin,Basin and Range province","AZ?,NM,TX",""
"Moody Brook","Silurian,Lower- Silurian, middle","New England province","ME","Buckfield Group",""
"Moodys Branch","Eocene, late","Mid-Gulf Coast basin,Gulf Coast basin","AL,LA,MS,TX",""
"Moorefield","Mississippian,Upper","Arkoma basin,Chautauqua platform","AR,OK",""
"Mooreville","Cretaceous,Upper","Black Warrior basin,Mid-Gulf Coast basin","AL,MS","Selma Group",""
"Moose River","Devonian,Lower","New England province","ME",""
"Moran","Permian,Lower","Bend arch","TX","Cisco Group",""
"Moreno","Cretaceous,Upper- Paleocene- Paleocene","San Joaquin basin","CA",""
"Morgan","Jurassic,Upper","Arkla basin","AR","",""
"Morgan (UT)","Pennsylvanian,Lower-Pennsylvanian-Middle","Green River basin,Uinta uplift,Uinta basin,Wasatch uplift","CO,UT,WY"
"Mormon","Jurassic,Middle","Sierra Nevada province","CA",""
"Morrison","Jurassic,Upper- Cretaceous,Lower (local)","Anadarko basin,Big Horn basin,Black Mesa basin,Central Montana uplift,Chadron arch,Denver basin,Green River basin,Las Vegas-Raton basin,Montana folded belt province,North Park basin,Orogrande basin,Palo Duro basin,Paradox basin,Piceance basin,Plateau sedimentary province,Powder River basin,San Juan basin,San Luis basin,Sierra Grande uplift,Sweetgrass arch,Uinta basin,Wasatch uplift,Williston basin","AZ,CO,KS,MT,ND,NE,NM,OK,SD,TX,UT,WY",""
"Morrow Creek Shale","Eocene","Green River basin","WY","","(+Morrow Creek Member (WY) is equivalent to Laney Shale Member of Green River Formation.  See Laney.","
"Morrow","Pennsylvanian,Lower","Arkoma basin","AR,CO,IA,KS,MO,NE,NM,OK,TX",""
"Moscow","Devonian,Middle","Appalachian basin","MD,NY,PA,WV","Hamilton Group",""
"Mosheim Limestone","Ordovician,Middle","Appalachian basin","AL,GA,TN,VA"
"Moss Lake dolomite","Silurian","Michigan northern peninsula","MI"
"Moss","Miocene","Plateau sedimentary province","AZ",""
"Moultrie Limestone","Eocene, middle","Atlantic Coast basin","GA,SC","Santee Limestone",""
"Mount Abraham","Precambrian- Proterozoic,Upper- Cambrian,Lower","New England province","VT","Camels Hump Group",""
"Mount Auburn","Ordovician,Upper","Cincinnati arch","in,ky,OH"
"Mount Cap","Cambrian,Lower-Cambrian,Middle",,"NT,yt"
"Mount Eden","Pliocene","Mojave basin","CA"
"Mount Hawk","Devonian,Upper",,"AB"
"Mount Laurel","Cretaceous,Upper","Atlantic Coastal basin","DE,MD,NJ,PA","Monmouth Group"
"Mount Mark","Pennsylvanian,Upper-Permian,Lower","Vancouver Is","BC"
"Mount Simon Sandstone","Cambrian,Upper","Wisconsin arch,Illinois basin,Iowa shelf,Cincinnati arch,Sioux uplift,Michigan basin,Appalachian basin","IA,IL,IN,KY,MI,MN,MO,OH,WI,WV"
"Mount Whyte","Cambrian,Middle","Rocky Mountains","ab,BC"
"Mowery Shale","Cretaceous,Middle",,"CO,SD,WY"
"Mowich","Jurassic,Lower","Eastern Columbia basin","OR"
"Mowry Shale","Cretaceous,Upper","Big Horn basin,Central Montana uplift,Chadron arch,Denver basin,Green River basin,Montana folded belt province,North Park basin,Powder River basin,Sweetgrass arch,Uinta uplift,Williston basin,Wind River basin,Yellowstone province","CO,MT,ND,SD,UT,WY",""
"Moydart","Silurian",,"NS"
"Mount Lemmon","Devonian","Basin and Range province","AZ ",""
"Mugford","PRoterozoic","Labrador, North Coast","NL"
"Mule Spring Limestone","Cambrian,Lower","Great Basin province","CA,NV",""
"Mulkay Coal","Pennsylvanian",,"MO"
"Munising","Cambrian,Upper","Michigan basin","IN,MI",""
"Mural Limestone","Cretaceous,Lower","Pedregosa basin","AZ,NM","Bisbee Group",""
"Murfreesboro Limestone","Ordovician,Middle","Appalachian basin,Cincinnati arch","GA,TN,VA","Stones River Group",""
"Muskiki Shale","Cretaceous",,"AB,BC"
"Myrtle","jrassic,Upper-Cretaceous,Lower","Western Columbia basin","OR"
"Nacatosh Sand","Cretaceous,Upper","South Arkansas","AR"
"Nacimiento","Paleocene- Paleocene","San Juan basin","CO?,NM,tx",""
"Naco Limestone Dolomite","Pennsylvanian,Middle-Permian,Lower","Pedregosa,Basin and Range province,Black Mesa basin,Plateau sedimentary province","AZ,NM"
"Naheola","Paleocene","Mid-Gulf Coast basin","AL,MS","Midway Group"
"Nanaimo","Cretaceous,Upper","Western Columbia basin","bc,WA",""
"Nanjemoy","Eocene, early","Atlantic Coast basin","DC,DE,MD,VA",""
"Nankoweap","Precambrian- Proterozoic,Middle","Southern Rocky Mountain region","AZ","Grand Canyon Supergroup",""
"Naomi Peak Limestone","Cambrian,Middle","Wasatch uplift,Snake River basin","ID,UT"
"Napanee Limestone","Ordovician,Middle","Appalachian basin","NY,on",""
"Narragansett","Permian","New England province","CT,MA?,RI",""
"Nashua","Pliocene,Upper-Pliestocene,Lower","South Georgia sedimentary province, Florida platform","FL"
"Nassau","Precambrian- Proterozoic,Upper- Cambrian,Lower","New England province","MA,NY,VT",""
"Navajo Sandstone","Triassic(?)- Jurassic- Jurassic,Lower","Black Mesa basin,Great Basin province,Paradox basin,Piceance basin,Plateau sedimentary province,San Juan basin,Uinta basin,Uinta uplift","AZ,CO,NM,UT","Glen Canyon Group",""
"Navarro","Cretaceous,Upper","East Texas basin,Ouachita folded belt","TX"
"Navesink","Cretaceous,Upper","Atlantic Coast basin","DE,md,NJ","Monmouth Group"
"Negaunee","Precambrian- Proterozoic,Lower","Lake Superior region,Wisconsin arch","MI","Menominee Group",""
"Nellie Bly","Pennsylvanian,Upper","Chautauqua platform","OK","Skiatook Group",""
"Nepean","Ordovician,Lower","Appalachian basin","NY,on",""
"Neroly Sandstone","Miocene, late","California Coast Ranges province","CA","San Pablo Group",""
"Nestucca","Eocene","Western Columbia basin","OR"
"Neuville","Devonian,Upper","St Lawrence Lowland","QC"
"Nevada","Devonian,Lower- Devonian,Middle","Great Basin province","NV","(+Nevada Formation (NV*) or +Nevada Group (NV) abandoned.","
"New Albany Shale","Devonian,Middle- Devonian,Upper- Mississippian,Lower","Cincinnati arch,Illinois basin","IL,IN,KY",""
"New Castle Chert","Devonian",,"IN"
"New Egypt","Cretaceous,Upper","Atlantic Coast basin","NJ",""
"New Fork","Eocene","Green River basin","WY","Wasatch"
"New Haven Arkose","Triassic,Upper-Jurassic,Lower","New England province,Hartford basin,Pomperaug basin","CT,MA","Newark Supergroup"
"New Hope Limestone","Ordovician",,""AL","Probably Lenoir Limestone"
"New Milford","Devonian,Upper","Appalachian basin","PA","Susquehanna Group",""
"New Oxford","Triassic,Upper","Newark basin","MD,PA","Newark Supergroup",""
"New Providence","Mississippian,Lower","Appalachian basin,Cincinnati arch,Illinois basin","IN,KY,TN",""
"New Scotland","Devonian,Lower","Appalachian basin","MD,ms,NJ,NY,PA,VA,WV","Helderberg Group",""
"Newala Dolomite","Ordovician,Lower","Appalachian basin","AL,GA,KY,VA",""
"Newark","Triassic,Middle- Triassic,Upper- Jurassic,Lower","New England province,Piedmont-Blue Ridge province","CT,MA,MD,NC,NJ,NY,PA,SC,VA",""
"Newman Limestone","Mississippian,Upper","Appalachian basin","KY,TN,VA",""
"Newport","Pleistocene, middle","Atlantic Coast basin","NC","Flanner Beach Formation",""
"Newport (California)","Pliocene","Los Angeles basin","CA"
"Newton Creek Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Neyland","Cretaceous,Upper","East Texas basin,Ouachita folded belt","TX"
"Neylandville Dolomite Marl","Cretaceous,Upper","East Texas basin",Ouachita folded belt","TX","Navarro Group"
"Niagara Falls","Silurian- Silurian,Lower- Silurian,Upper","Appalachian basin","ia,il,NY,wi","Niagara Falls Member of Goat Island Dolomite"
"Niagaran","Silurian,Middle",,"ia,il,ky,md,wi","Niagaran group"
"Niguel","Pleistocene,Pliocene","Los Angeles basin","CA",""
"Nikanassin","Jurassic,Upper-Cretaceous,Lower",,"AB"
"Ninemile","Ordovician,Middle- Ordovician,Lower","Great Basin province","NV","Pogonip Group",""
"Niobrara","Cretaceous,Upper","San Juan basin,Salina basin,Central Montana uplift,Powder River basin,Denver basin,Sioux uplift,Las Vegas-Raton basin,Williston basin,Iowa shelf,North Park basin","CO,KS,MN,MT,ND,NE,NM,SD,sk,tx?,WY",""
"Nolichucky Shale","Cambrian,Upper","Appalachian basin","AL,GA,KY,TN,VA,WV","Conasauga Group",""
"Nopah Dolomite Shale","Cambrian,Upper","Plateau sedimentary province, Great Basin province","AZ,CA,NV"
"Nopah","Cambrian,Upper","Plateau sedimentary province,Great Basin province","AZ,CA,NV"
"Nordness"
"Normanskill Shale","Ordovician,Middle","New England province","NY,VT",
"North Anson","Pleistocene","New England province","ME",""
"North Evans Limestone","Devonian,Upper- Devonian,Middle","Appalachian basin","NY","Genesee Group",""
"North Hill Oolite","Mississippian,Upper (MO)- Mississippian,Lower","Iowa shelf","IA,IL,MO",""
"North Horn","Cretaceous,Upper- Paleocene- Paleocene- Eocene (local)","Uinta basin,Wasatch uplift,Paradox basin","UT",""
"North Vernon Limestone","Devonian,Middle","Cincinnati arch,Illinois basin","IN,ky","Muscatatuck Group",""
"Northview","Mississippian,Lower","Ozark uplift","AR,KS,MO,OK","Chouteau Group",""
"Norway Point","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Notch Peak","Cambrian,Upper-Ordovician,Lower","Great Basin province","UT"
"Nounan","Cambrian,Middle-Cambrian,Upper","Wasatch uplift","ID"
"Nye Mudstone","Miocene- Oligocene","Western Columbia basin","OR",""
"Oakville Sandstone","Miocene","Gulf Coast basin","TX",""
"Oatka Creek","Devonian,Middle","Appalachian basin","NY,PA"
"Ocala","Eocene- Oligocene(?)","Florida platform,South Georgia sedimentary province,Atlantic Coast basin,Mid-Gulf Coast basin","AL,FL,GA,MS,SC",""
"Ocmulgee","Eocene,Upper","South Georgia sedimentary province","GA"
"Odell Limestone Shale","Permian,Lower","Nemaha anticline","KS,NE"
"Odenville Limestone","Ordovician,Lower- Ordovician,Middle","Appalachian basin","AL","Chase Group"
"Ogallala","Miocene, middle- Miocene, late","Chadron arch,Wind River basin,Denver basin,Powder River basin,Sioux uplift,Permian basin,Sierra Grande uplift,Anadarko basin,Palo Duro basin","CO,KS,NE,NM,OK,SD,TX,WY",""
"Ogilvie","Devonian,Middle- Devonian,Lower","Yukon-Porcupine province","AK,yt",""
"Ohio Shale","Devonian,Upper","Cincinnati arch,Appalachian basin","KY,OH,PA,VA,WV",""
"Ojo Alamo Sandstone","Cretaceous,Upper- Paleocene- Paleocene","San Juan basin","CO?,NM",""
"Olathe Limestone","Pennsylvanian,Upper","Iowa shelf","KS","Stanton Limestone of Lansing Group",""
"Olcott","Miocene,Middle","Denver basin","NE","Hemingford Group"
"Oldham","Silurian,Lower","Cincinnati arch","KY,OH",
"Oldman","Cretaceous,Upper","Southern Alberta","AB","Judith River Group"
"Olean Conglomerate","Pennsylvanian,Lower","Appalachian basin","NY,PA",""
"Onaga Shale","Permian,Lower","Nemaha anticline","KS,NE","Admire Group",""
"Oneonta","Devonian,Middle- Devonian,Upper","Appalachian basin","NY,wi","Genesee Group",""
"Ono","Cretaceous,Lower","Sacramento basin","CA","","(+Ono Formation (CA) replaced with part of Budden Canyon Formation.  See Budden Canyon.","
"Onondaga","Devonian,Lower- Devonian,Middle","Appalachian basin","in,ky,MD,NJ,NY,OH,on,PA,VA,WV",""
"Oologah Limestone","Pennsylvanian,Middle","Chautauqua platform","OK","Tulsa Group"
"Opohonga Limestone","Ordovician,Lower","Wasatch uplift,Great Basin province","UT"
"Oquirrh","Mississippian,Upper (local)- Pennsylvanian,Lower- Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower (local)","Great Basin province,Snake River basin,Wasatch uplift,Uinta basin","ID,UT",""
"Orby Head","Permian","Prince Edward Island","PE"
"Orcutt","Pleistocene","Santa Maria basin","CA",""
"Oread Limestone","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE,OK","Shawnee Group",""
"Oregonia","Ordovician,Upper","Cincinnati arch","in,ky,OH",""
"Orella","Oligocene","Denver basin","NE,sd,WY","Brule Formation",""
"Oriskany","Devonian,Lower","Appalachian basin","KY,MD,NJ,NY,OH,PA,TN,VA,WV",""
"Orr Limestone","Cambrian,Upper","Great Basin province","UT"
"Orwell Limestone","Ordovician,Middle","New England province","VT","Black River Group",""
"Osgood","Silurian- Silurian, middle","Cincinnati arch","AL,IN,KY,OH,TN",""
"Oswayo","Devonian,Upper- Mississippian,Lower(?)","Appalachian basin","MD,NY,PA,WV",""
"Ottawa","Ordovician","not stated","IL,KY,on",""
"Otter Point","Jurassic,Upper-Cretaceous,Lower","Oregon-Washington Coast Ranges province","OR"
"Ottosee Shale","Ordovician,Middle","Appalachian basin","GA,TN,VA",""
"Otuk","Triassic,Lower- Triassic,Middle- Triassic,Upper- Jurassic,Lower- Jurassic,Middle","Alaska Northern region","AK","Etivluk Group",""
"Ouray Limestone","Devonian,Upper","Piceance basin,San Juan basin,Paradox basin,San Juan Mountains province,Plateau sedimentary province,Black Mesa basin","AZ,CO,NM,UT",""
"Outram","Ordovician,Lower",,"AB"
"Owens Valley","Permian","Great Basin province","CA",""
"Owenyo Limestone","Permian,Lower","Great Basin province","CA","Owens Valley Formation",""
"Owl Creek","Cretaceous,Upper","Upper Mississippi embayment,Black Warrior basin,Illinois basin","IL,KY,MO,MS,TN","Selma Group",""
"Oxford","Ordovician,Upper","Cincinnati arch","OH","Whitewater Formation","(+Oxford Member of Whitewater Formation (OH) considered abandoned?  Uncertain if still in use by the OH Geol. Survey.  Abandoned by the USGS.","
"Oxford (ON)","Ordovician",,"on"
"Ozan","Cretaceous,Upper","East Texas basin,Ouachita folded belt,Arkla basin,South Oklahoma folded belt","AR,LA,OK,TX",""
"Paget","Cambrian,Upper","Canadian Rockies","BC"
"Pahasapa Limestone","Mississippian,Lower","Chadron arch,Powder River basin,Williston basin","NE,SD,WY"
"Paint Creek","Mississippian,Upper","Illinois basin","IL,KY,MO"
"Pakowki","Cretaceous,Upper","Southern Alberta","AB"
"Palliser","Devonian,Upper",,"AB"
"Palm Canyon","Paleozoic-Mesozoic","Peninsular Ranges province","CA",""
"Palm Springs","Pliocene-Pleistocene","Salton basin","CA"
"Palmetto","Carboniferous","Piedmont-Blue Ridge province","GA",""
"Palmetto (NV)","Ordovician","Great Basin Province","NV"
"Palo Pinto","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX","Canyon Group",""
"Palos Verdes Sand","Pleistocene","Los Angeles basin","CA",""
"Panaca","Mississippian,Upper","Illinois basin","IN,KY","Panaca, Lincoln Co, NV",""
"Panaca (NV)","Pliocene","Great Basin Province","NV"
"Paoli Limestone","Mississippian,Upper","Illinois basin","il,IN,KY"
"Parachute Creek","Eocene","Piceance basin,Uinta basin","CO,UT","Green River Formation",""
"Paradise","Mississippian,Upper","Pedregosa basin,Basin and Range province","AZ,NM",""
"Park City","Permian,Lower","Wasatch uplift,Uinta uplift,Green River basin,Great Basin province,Yellowstone province,Snake River basin,Montana folded belt province,Wind River basin,Big Horn basin","CO,ID,MT,NV,UT,WY",""
"Parker Slate","Cambrian,Lower-Cambrian,Middle","Champlain Slice","VT,qc?",""
"Parkhead Sandstone","Devonian,Upper","Appalachian basin","MD,PA,WV",""
"Parma Sandstone","Pennsylvanian,Middle- Pennsylvanian,Lower- Mississippian,Upper","Michigan basin","MI","Saginaw Formation",""
"Parrish Limestone Shale","Devonian,Upper","Appalachian basin","NY","Cashaqua Shale Member of Sonyea Formation",""
"Parrsboro","Pennsylvanian?",,"NS","Mabou Group"
"Paskapoo","Paleocene",,"AB"
"Passaic","Triassic,Upper- Jurassic,Lower","Piedmont-Blue Ridge province,Newark basin","NJ,NY,PA","Brunswick Group",""
"Patapsco","Cretaceous,Lower- Cretaceous,Upper","Atlantic Coast basin","DC,DE,MD,NJ,PA,VA",""
"Pawlet Graywacke","Ordovician,Middle","New England province","VT",""
"Pawnee Creek","Miocene","Denver basin","CO",""
"Pawpaw","Cretaceous,Lower","Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt,Strawn basin","OK,TX"
"Peace Creek","Pliocene,Upper","Central Florida panhandle","FL"
"Peace River","Miocene- Pliocene","Florida platform","FL","Peace River Formation of Hawthorn Group"
"Pebbles","Silurian",,"OH"
"Peedee","Cretaceous,Upper","Atlantic Coast basin","NC,SC",""
"Pekin","Triassic,Upper","Piedmont-Blue Ridge province,Wadesboro basin,Sanford basin,Durham basin,Deep River basin","NC","Chatham Group of Newark Supergroup",""
"Pelican","Cretaceous","Western Canada basin","AB","Colorado Group"
"Pelican Island","Pleistocene","Great Basin province","NV","Pyramid Lake Member of Mount Mazama Formation",""
"Pella","Mississippian,Upper","Iowa shelf","IA",""
"Pender","Cretaceous,Upper","Nanaimo basin","BC"
"Penn Yan Shale","Devonian,Middle- Devonian,Upper","Appalachian basin","NY,PA","Genesee Formation",""
"Pennington","Mississippian,Upper- Pennsylvanian,Lower","Appalachian basin","AL,GA,KY,TN,VA,WV",""
"Pentagon Shale","Cambrian,Middle","Montana folded belt province,Sweetgrass arch","MT"
"Percha Shale","Devonian,Upper","Orogrande basin,Basin and Range province,Pedregosa basin","AZ,NM,TX",""
"Perdido","Mississippian","Great Basin province","CA",""
"Perdrix","Devonian,Upper","Rocky Mountains","AB"
"Perham","Silurian","New England province","ME"
"Perryville","Ordovician,Middle","Cincinnati arch","KY"
"Petit Jardin","Cambrian,Upper","Western Newfoundland","NL"
"Petoskey Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Peyto","Cambrian,Lower","Canadian Rockies","AB,BC"
"Peyton","Pleistocene- Holocene","Illinois basin","IL",""
"Pfieffer Shale","Cretaceous,Middle",,"KS","Pfieffer Shale member of Greenhorn Limestone Formation"
"Phi Kappa","Ordovician,Lower-Ordovica,Middle","Snake River basin,Idaho Mountains province","ID"
"Phosphoria","Permian,Lower","Idaho Mountains province,Montana folded belt province,Powder River basin,Wasatch uplift,Snake River basin,Denver basin,Green River basin,Wind River basin,Great Basin province","ID,MT,NV,UT,WY",""
"Picacho De Calera","Devonian,Upper","Basin-and-Range province","AZ",""
"Pico","Pleistocene- Pliocene","Los Angeles basin","CA",""
"Pictured Cliffs Sandstone","Cretaceous,Upper","San Juan basin","CO,NM",""
"Pierre Shale","Cretaceous,Upper","Anadarko basin,Chadron arch,Denver basin,Las Vegas-Raton basin,North Park basin,Powder River basin,Salina basin,Sioux uplift,Williston basin,Wind River basin","CO,KS,MN,MT,ND,NE,NM,SD,WY",""
"Pierson Point Shale","Pennsylvanian,Upper","Forest City basin","KS,NE"
"Pine Creek","Pennsylvanian","Appalachian basin","KY,PA"
"Pinecrest","Pliocene","Florida platform","FL",""
"Pinyon Conglomerate","Cretaceous,Upper- Paleocene- Paleocene","Yellowstone province","WY",""
"Pinyon Peak Limestone","Devonian,Upper","Great Basin province,Wasatch uplift","UT",""
"Pioche","Cambrian,Lower- Cambrian,Middle","Great Basin province","CA,NV,UT",""
"Pirate Cave","Cambrian,Lower- Cambrian,Middle(?)","New England province","RI",""
"Pitkin Limestone","Mississippian,Upper","Arkoma basin,Chautauqua platform,Ozark uplift","AR,OK"
"Pittsburg Bluff","Oligocene- Eocene","Western Columbia basin","OR",
"Pittsburg","Triassic","Idaho Mountains province","ID"
"Pittsburgh","Pennsylvanian,Upper","Appalachian basin","PA","Monongahela Group",""
"Pittsford Shale","Silurian,Upper","Appalachian basin","NY","Salina Group",""
"Platteville Dolomite","Ordovician,Middle","Wisconsin arch,Williston basin,Iowa shelf,Sioux uplift,Forest City basin,Illinois basin","IA,IL,KS (subsurface),MN,MO,WI",""
"Plattin","Ordovician,Middle","Ozark uplift,Illinois basin,Forest City basin,Upper Mississippi embayment","AR,IL,IN,KS,MO",""
"Plattsburg Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Lansing Group",""
"Plattsmouth Limestone","Pennsylvanian","Nemaha anticline,Forest City basin","IA,KS,MO,NE","Oread Limestone",""
"Plum Brook Shale","Devonian,Middle","Appalachian basin","OH",""
"Pogonip","Cambrian,Upper- Ordovician,Lower- Ordovician,Middle","Great Basin province","CA,ID,NV,UT",""
"Point Arena","Miocene","Northern Coast Range province","CA",""
"Point Edward","Mississippian",,"NS"
"Point Pleasant","Ordovician,Middle- Ordovician,Upper","Appalachian basin,Cincinnati arch","IN,KY,OH",""
"Polecat Bench","Eocene- Paleocene- Paleocene","Big Horn basin","WY",""
"Poleta","Cambrian,Lower","Great Basin province","CA,NV",""
"Police Post","Ccambrian Lower","Ellesmere Is","NU"
"Polk Creek Shale","Ordovician","Ouachita folded belt","AR"
"Pomquet","Mississippian,Upper","Cape Breton Is","NS","Mabou Group"
"Popo Agie","Triassic,Upper","Yellowstone Province,Green River Basin,Wind River Basin,Big Horn Basin","CO?,WY"
"Port Clarence Limestone","Precambrian, late- Mississippian","Seward Peninsula province,Alaska West-Central region","AK","(+Port Clarence Limestone (AK) abandoned.","
"Port Ewen Chert","Devonian,Lower","Appalachian basin","NJ,NY,PA,VA,WV","Helderberg Group",""
"Port Jervis Limestone","Devonian,Lower","Appalachian basin","MD,NY,PA,VA,WV","Helderberg Group",""
"Port Orford","Pliocene,Pleistocene","Western Columbia basin","OR"
"Portage","Devonian","Appalacian basin","NY"
"Portage Brook","Ordovician,Lower- Ordovician,Middle","New England province","ME","the Albee Formation",""
"Porters Creek Clay","Paleocene- Paleocene","Upper Mississippi embayment,Illinois basin,South Georgia sedimentary province,Black Warrior basin,Mid-Gulf Coast basin,Arkla basin","AL,AR,GA,IL,KY,LA,MO,MS,TN","Midway Group",""
"Porters Road","Cambrian,Middle",,"NB,NL"
"Portland Arkose","Jurassic,Lower-Jurassic,Middle","New England province,Hartford basin,Pomperaug basin","Ct,"MA","Newark Supergroup"
"Potomac","Cretaceous,Lower- Cretaceous,Upper","Atlantic Coast basin","DC,DE,ma,MD,NJ,ny,PA,ri,VA",""
"Potsdam Sandstone","Cambrian,Upper- Ordovician,Lower","Adirondack uplift,New England province,Appalachian basin,Cincinnati arch","IN (subsurface),NY,on,PA,qc,VT,wi",""
"Potter Farm","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Pottsville","Pennsylvanian,Lower- Pennsylvanian,Middle","Appalachian basin","AL,MD,OH,PA,WV",""
"Poultney","Cambrian,Upper- Ordovician,Lower- Ordovician,Middle","New England province","NY,VT",""
"Poway Conglomerate","Eocene, middle- Eocene, late","Peninsular Ranges province","CA",""
"Prairie Bluff Chalk","Cretaceous,Upper","Mid-Gulf Coast basin","AL,MS","Selma Group",""
"Preachersville","Ordovician,Upper","Cincinnati arch","KY,OH","the Drakes Formation",""
"Presumpscot","Pleistocene, late","New England province","ME,NH",""
"Price","Devonian,Upper- Mississippian,Lower","Appalachian basin","KY,MD,VA,WV",""
"Prince Creek","Cretaceous,Upper to Tertiary- Campanian to Paleocene- Campanian to Paleocene","Alaska Northern region","AK",""
"Prout Limestone","Devonian,Middle","Appalachian basin","OH",""
"Prospect Mountain Quartzite","Cambrian,Lower","Great Basin province","AZ,CA,NV,UT"
"Providence Sand","Cretaceous,Upper","South Georgia sedimentary province,Mid-Gulf Coast basin","AL,GA",""
"Ptarmigan","Ordovician,Lower","South Park basin,Piceance basin,Denver basin","CO","Manitou Formation of Horseshoe Mountain Group",""
"Pueblo","Permian,Lower","Bend arch","TX","Wichita Group",""
"Puente","Miocene","Los Angeles basin","CA",""
"Puerco","Paleocene- Paleocene","San Juan basin","NM","Nacimiento Group","(+Puerco Formation of Nacimiento Group (NM*) considered abandoned.  Regarded as faunal zone in Nacimiento Formation and provincial mammalian age Puercan.  See Nacimiento and Puercan.","
"Pungo River","Miocene","Atlantic Coast basin","NC,VA",""
"Purisima","Pliocene- Miocene","Santa Cruz basin","CA",""
"Puskwaskau","Cretaceous,Upper",,"AB"
"Putnam Hill Limestone","Pennsylvanian,Middle","Appalachian basin","OH","Allegheny Formation",""
"Putnam","Precambrian(?)- Proterozoic,Upper(?)- Cambrian(?)- Ordovician(?)","New England province","CT,MA",""
"Putnam (TX)","Permian,Lower","Bend arch","TX"
"Pyramid","Miocene, middle","Southern Oregon basin","NV",""
"Pyramid Hill Sand","Miocene, Lower","Sacramento-San Joaquin basin","CA","Basal Temblor formation"
"Quebec","Ordovician","St Lawrence Lowland","QC"
"Queen Hill Limestone Shale","Pennsylvanian,Upper","Nemaha anticline,Forest City basin","IA,KS,MO,NE","Lecompton Limestone of Shawnee Group",""
"Quiburis","Miocene-Pliocene","Basin and Range province","AZ"
"Rabble Run","Silurian, middle","Appalachian basin","MD,PA,WV","Mifflintown Formation",""
"Racine Dolomite","Silurian, middle","Wisconsin arch","IL,WI",""
"Rail Cabin","Triassic,Upper","Snake river basin","OR"
"Ralston","Eocene","Big Horn basin","WY"
"Ramp Creek","Mississippian,Lower- Mississippian,Upper","Illinois basin","IL,IN"
"Rancocas","Cretaceous,Upper- Paleocene- Paleocene- Eocene","Atlantic Coast basin","DE,MD,NJ,PA",""
"Rangely","Cretaceous,Upper","Piceance basin","CO"
"Raritan","Cretaceous,Upper","Atlantic Coast basin","MA,MD,NJ,NY,PA,RI",""
"Rathbunville School","Ordovician,Lower","Appalachian basin","NY"
"Rattlesnake","Cretaceous,Upper","Permian basin","TX","(+Rattlesnake Formation or +Rattlesnake Beds (TX) replaced with Aguja Formation.  See Aguja.","
"Rattlesnake (OR)","Miocene,Upper",,"OR"
"Ravenscrag","Paleocene,Upper",,"SK"
"Raysor Marl","Pliocene","South Georgia sedimentary province","GA,SC"
"Red Bank Sand","Cretaceous,Upper","Atlantic Coast basin","DE,NJ","Monmouth Group"
"Red Island Road","Devonian,Upper","Anticosti basin","NL"
"Red Mountain","Silurian,Lower- Silurian, middle- Silurian,Upper","Appalachian basin","AL,GA",""
"Red Pine Shale","Precambrian- Proterozoic,Upper","Southern Rocky Mountain region","UT","Uinta Mountain Group",""
"Red River","Cretaceous,Upper",,"TX"
"Red River (MB)","Ordovician",,"MB,sk"
"Red Road","Devonian,Lower",,"NT"
"Red Rock Sandstone","Pennsylvanian","Iowa shelf","IA,ks",""
"Redfield","Eocene","Desha basin","AR","Jackson Group",""
"Redwall Limestone","Mississippian,Lower- Mississippian,Upper","Great Basin province,Plateau sedimentary province,Basin and Range province,Salton basin,Black Mesa basin","AZ,CA,NM,UT",""
"Reed Dolomite","Ediacaran","Great Basin province","CA,NV"
"Reed (Utah)","Mississippian,Upper","Wasatch uplift","UT",""
"Reeds Spring Limestone","Mississippian,Lower","Ozark uplift","AR,KS,MO,OK",""
"Reedsville","Ordovician,Upper","Appalachian basin","OH,PA,TN,VA,WV",""
"Renault Limestone","Mississippian,Upper","Illinois basin,Ozark uplift","IL,IN,KY,MO",""
"Rennie Shale","Cambrian, Middle","Idaho Mountains province","ID"
"Renova","Eocene,Upper-Miocene,Lower","Montana folded belt province","MT","Bozeman Group"
"Rhinestreet","Devonian,Upper","Appalachian basin","KY,NY,OH,PA,TN,VA,WV",""
"Ricardo","Miocene","Mojave basin","CA",""
"Riceville Shale","Devonian,Upper","Appalachian basin","PA,WV",""
"Richmond","Ordovician,Upper","Cincinnati arch,Illinois basin,Ozark uplift,Michigan basin","AL,ga,IL,IN,KY,MI,MO,OH,TN","","(+Richmond Group has been abandoned as a lithostratigraphic term, and has been used as a chronostratigraphic term (Richmondian Stage) for some time.  To prevent confusion, the use of Richmond as a lithostratigraphic term should be avoided.","
"Rico","Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower","San Juan Mountains province,San Juan basin,Paradox basin","AZ,CO,NM,UT",""
"Riddle","Cretaceous,Lower- Jurassic,Upper","Western Columbia basin","OR","Myrtle Group",""
"Ridgeley","Devonian,Lower","Appalachian basin","MD,NJ,PA,VA,WV","Old Port Formation",""
"Rierdon","Jurassic,Middle","Central Montana uplift,Sweetgrass arch,Williston basin,Montana folded belt province","MT,ND,WY","Ellis Group",""
"Rifle Hill","Ordovician,Upper","Iowa shelf,Wisconsin arch","IA,IL,MN","Stewartville Formation of Galena Group",""
"Ringold","Pleistocene- Pliocene- Miocene","Eastern Columbia basin","WA",""
"Ripley","Cretaceous,Upper","Upper Mississippi embayment,Mid-Gulf Coast basin,Black Warrior basin,South Georgia sedimentary province","AL,GA,MS,TN","Selma Group",""
"Ripogenus","Silurian,Lower-Silurian,Middle","New England Province","ME"
"Road Canyon","Permian,Lower","Permian basin","TX",""
"Roberts Mountain","Silurian,Lower-Devonian,Lower","Snake River basin,Great Basin province,Idaho Mountains province","ID,NV"
"Rochester","Silurian- Silurian,Lower- Silurian, middle","Appalachian basin","MD,MI,NY,OH,on,PA,WV","McKenzie Formation",""
"Rock Lake Limestone Shale","Pennsylvanian,Upper","Nemaha anticline","IA,KS,NE","Stanton Limestone of Lansing Group",""
"Rock Springs","Cretaceous,Upper","Green River basin","WY","Mesaverde Group",""
"Rockcastle Conglomerate","Pennsylvanian,Lower- Pennsylvanian,Middle","Appalachian basin","GA,KY,TN","Lee Formation",""
"Rockcastle Sandstone","Pennsylvanian,Lower- Pennsylvanian,Middle","Appalachian basin","GA,KY,TN","Lee Formation",""
"Rockdale","Paleocene","Gulf Coast basin","LA,TX"
"Rockport Limestone","Cambrian,Lower- Silurian,Lower","New England province","ME","Rockland Formation",""
"Rockport Quarry Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group",""
"Rocky Mountain Quartzite","Silurian,Upper","New England province","ME",""
"Rocky Mountain (Canada)","Pennsylvanian-Permian","Candian Rockies","AB"
"Rome","Cambrian,Lower- Cambrian,Middle- Cambrian,Upper","Appalachian basin,Black Warrior basin","AL,GA,KY,MS,NC,OH,TN,VA,WV","=Montevallo formation""
"Romney Shale","Devonian,Middle- Devonian,Upper","Appalachian basin","MD,PA,VA,WV",""
"Rose Canyon Shale","Eocene","Peninsular Ranges province","CA","+Rose Canyon Shale Member of La Jolla Formation","(Rocks of +Rose Canyon Shale Member of La Jolla Formation (CA) reallocated to Mount Soledad Formation, Ardath Shale, Scripps Formation, and Friars Formation of La Jolla Group.  See Mount Soledad, Ardath, Scripps, Friars, and La Jolla.","
"Rose Hill","Silurian, middle- Silurian,Lower","Appalachian basin","MD,PA,TN,VA,WV",""
"Rosebud","Miocene, early middle","Sioux uplift","NE,SD",""
"Roseburg","Paleocene-Eocene,Lower","Oregon-Washington Coast Ranges province,Klamath Mountains province","OR"
"Ross Brook","Silurian","Pictou County","NS"
"Ross (PA) Coal","Pennsylvanian","Applachian basin","PA"
"Ross Lake Shale","Cambrian,Middle","Eastern BC","ab,BC","Cathederal dolomite"
"Ross Limestone","Devonian,Lower","Cincinnati arch","TN","Olive Hill Formation",""
"Roubidoux Dolomite","Ordovician,Lower","Ozark uplift,Illinois basin,Upper Mississippi embayment,Arkoma basin,Forest City basin,Chautauqua platform,Cherokee basin,Salina basin,Anadarko basin,Central Kansas uplift,Sedgwick basin","AR,IL,KS (subsurface),MO,OK",""
"Round Mountain","Miocene, middle","San Joaquin basin","CA",""
"Rowland","Ordovician,Upper","Cincinnati arch","IN,KY","the Drakes Formation",""
"Ruby","","Basin-and-Range province","AZ",""
"Rundle","Mississippian,Upper- Mississippian,Lower","Montana folded belt province","ab,MT",""
"Runningwater","Miocene","Denver basin","NE,WY",""
"Rust","Ordovician,Middle","Appalachian basin","NY","Rust member of Denley Limestone"
"Ryan Sandstone","Pennsylvanian,Upper","South Oklahoma folded belt","OK",""
"S Bar S","Pleistocene","Great Basin province","NV","Lahontan Valley Group",""
"Sabine","Eocene,Lower",,"LA,AL","Sabine group"
"Sabinetown","Eocene","East Texas basin","LA,TX","Wilcox Group",""
"Sage Hen Limestone Shale","Cretaceous,Upper","Williston basin","MT","Colorado Shale","(+Sage Hen Limestone Member of Colorado Shale (MT) considered obsolete?  Uncertain if still in use by the MT Geol. Survey.  Not used by the USGS.","
"Saginaw","Pennsylvanian,Lower- Pennsylvanian,Middle","Michigan basin","MI",""
"Salamanca Conglomerate","Pleistocene, late- Holocene","Appalachian basin","NY",""
"Salem Limestone","Mississippian,Upper","Cincinnati arch,Illinois basin,Appalachian basin,Iowa shelf,Ozark uplift,Forest City basin","IA,IL,IN,KS,KY,MO",""
"Salina","Silurian,Upper","Appalachian basin","IN,KY,MI,NY,OH,PA,WV",""
"Salmon","Devonian- Ordovician","Klamath Mountains province","CA",""
"Salona","Ordovician,Middle- Ordovician,Upper","Appalachian basin","PA,VA,WV","Trenton Group",""
"Salt Lake","Miocene,Pliocene","Wasatch uplift,Snake River basin,Great Basin province","ID,UT"
"Saluda","Ordovician,Upper","Cincinnati arch","IN,KY,OH",""
"San Andres Limestone","Permian,Lower","Orogrande basin,Permian basin,Palo Duro basin,San Juan basin,Las Vegas-Raton basin","az,NM"
"San Diego","Pliocene",""Peninsular Ranges province"","CA",
"San Emigdio","Oligocene- Eocene","San Joaquin basin","CA",""
"San Joaquin","Pliocene, early- Pliocene, late","San Joaquin basin","CA","Etchegoin Group",""
"San Jose","Eocene, early","San Juan basin","CO,NM",""
"San Juan","Pleistocene","Caribbean region","PR",""
"San Lorenzo","Oligocene- Eocene","Santa Cruz basin","CA",""
"San Onofre Breccia","Miocene","Capistrano basin","CA",""
"San Pablo","Miocene, late","California Coast Ranges province","CA",""
"San Pedro","Pleistocene- Pliocene","Los Angeles basin","CA",""
"Sand Canyon","Miocene, middle","Chadron arch","NE","Sheep Creek Formation of Hemingford Group",""
"Sandy","Precambrian","Llano uplift","TX","Packsaddle Group",""
"Santa Barbara","Pleistocene- Pliocene","Santa Maria basin","CA",""
"Santa Clara (California)","Pliocene-Pleistocene",,"CA"
"Santa Clara","","San Juan basin","NM",""
"Santa Fe","Oligocene- Miocene- Pliocene- Pleistocene","Denver basin,Estancia basin,Las Vegas-Raton basin,Orogrande basin,San Juan basin,San Luis basin,Basin and Range province","CO,NM,TX",""
"Santa Margarita Sandstone","Miocene, middle- Miocene, late","California Coast Ranges province,Mojave basin,Transverse Ranges province","CA",""
"Santee Limestone","Eocene, middle","Atlantic Coast basin,South Georgia sedimentary province","GA,SC",""
"Santiago","Eocene","Los Angeles basin","CA",""
"Sappington Chalk","Devonian,Upper-Mississippian,Lower","Snake River basin,Montana folded belt province,Sweetgrass arch","MT"
"Saratoga Chalk","Cretaceous,Upper","Arkla basin,Ouachita folded belt,East Texas basin","AR,LA,MS,TX"
"Sarpy","Pennsylvanian,Upper","Nemaha anticline","NE","Kansas City Group"
"Saturday Mountain","Ordovician,Middle-Silurian,Lower","Idaho Mountains province","ID"
"Sauquoit Shale","Silurian,Middle","Appalachian basin","NY"
"Sausbee","Pennsylvanian,Lower","Chautauqua platform,Arkoma basin","OK",""
"Savage Canyon","Miocene,Middle","Great Basin province","NV"
"Savage Dam","Mississippian,Upper","Appalachian basin","MD,PA,WV","Greenbrier Formation",""
"Sawatch","Cambrian,Upper","Eagle basin,Denver basin,Piceance basin,South Park basin","CO",""
"Scappoose","Oligocene-Miocene","Western Columbia basin","OR"
"Schaghticoke","Cambrian,Upper-Ordovician,Lower","New England province","NY,VT"
"Scherrer","Permian,Lower","Pedregosa basin,Basin and Range province","AZ,NM","Naco Group",""
"Schodack","Cambrian,Lower","New England province","NY,VT",""
"Schoharie","Devonian,Lower- Devonian,Middle","Appalachian basin","NJ,NY,PA",""
"Schoolcraft Dolomite","Silurian, middle","Michigan basin","MI,WI","Manistique Group",""
"Scollard","Cretaceous,Upper-Paleocene",,"AB"
"Scots Bay","Jurassic,Lower",,"NS"
"Scripps","Eocene,Middle","Peninsular Ranges province","CA","La Jolla Group"
"Seboomook","Devonian,Lower","New England Province","ME,NH"
"Secret Canyon Shale","Cambrian,Middle","Great Basin province","NV",""
"Selby","Ordovician,Middle","Appalachian basin","NY,on",""
"Sellersburg Limestone","Devonian,Middle","Cincinnati arch,Illinois basin","IN,KY",""
"Selma","Cretaceous,Upper","Mid-Gulf Coast basin,Black Warrior basin,Upper Mississippi embayment","AL,MS,TN",""
"Seminole","Pennsylvanian,Upper","Chautauqua platform,Forest City basin,Arkoma basin","KS,MO,OK","Skiatook Group",""
"Senora","Pennsylvanian,Middle","Arkoma basin,Chautauqua platform","AR,KS,MO,OK","Cabaniss Group",""
"Sentinel Butte","Paleocene","Williston basin","MT,ND","Fort Union Formation
"Sequatchie","Ordovician,Upper","Appalachian basin","AL,GA,TN,VA",
"Sespe","Miocene- Oligocene- Eocene","Santa Maria basin","CA",""
"Seven Devils","Permian,Lower-Triassic,Middle","Eastern Columbia basin,Snake River basin,Idaho Mountains province","ID,OR"
"Severn","Cretaceous,Upper","Atlantic Coast basin","DE,MD",""
"Severy Shale","Pennsylvanian,Upper","Cherokee basin","IA,KS,MO,NE,OK","Waubaunsee Group",""
"Seymour","Pleistocene","Bend arch,Palo Duro basin,Permian basin","TX",""
"Shadow Lake","Ordovician,Middle","Appalachian basin","on,PA",""
"Shady Dolomite","Cambrian,Lower- Cambrian,Middle","Appalachian basin,Black Warrior basin","AL,GA,MS,NC,TN,VA,WV",""
"Shaftsbury","Cretaceous,Lower",,"AB"
"Shakopee Dolomite Shale","Sioux uplift","IA,IL,MI,MN,WI","Shakopee, Scott Co, MN"
"Shale Hill","Eocene","Atlantic Coast basin","NJ",
"Shark River Marl","Eocene","Atlantic Coast basin","NJ"
"Sharon Springs Shale","Cretaceous,Upper","Powder River basin,Chadron arch,Williston basin,North Park basin,Las Vegas-Raton basin,Anadarko basin,Denver basin","CO,KS,MT,NE,NM ,SD,WY","Pierre Shale",""
"Sharps","Miocene, early","Chadron arch","NE,SD",""
"Shasta","Cretaceous,Lower",,"CA"
"Shasta Bally","Cretaceous,Lower","Klamath Mountains province","CA",""
"Shawangunk Conglomerate","Silurian,Lower- Silurian, middle- Silurian,Upper","Appalachian basin","NJ,NY,PA",""
"Shawnee","Pennsylvanian,Upper","Forest City basin,Sedgwick basin,Anadarko basin,Nemaha anticline","CO (subsurface),KS,MO,NE",""
"Sheep Creek","Miocene, early","Denver basin","NE,WY?","Hemingford Group",""
"Sheffield","Devonian,Upper","Iowa shelf","IA","Yellow Spring Group",""
"Sherbrooke","Cambrian,Upper","Canadian Rockies","BC"
"Sherburne","Devonian,Upper- Devonian,Middle","not stated","NY",""
"Shin Brook","Ordovician,Lower","New England province","ME",""
"Shinarump","Triassic,Upper","Paradox basin,San Juan basin,Black Mesa basin,Plateau sedimentary province,Great Basin province,Orogrande basin","AZ,NM,NV,UT","Chinle Formation",""
"Shoal Creek","","Great Basin province","UT",""
"Shoal River","Miocene, middle","Mid-Gulf Coast basin","FL","Alum Bluff Group",""
"Shoreham Limestone","Ordovician,Middle","New England province","NY,VT","Trenton Group",""
"Shublik (Alaska)","Triassic","Arctic Alaska","AK"
"Shublik","Jurassic,Lower","New England province,Pomperaug basin,Hartford basin","CT,MA","confluence of Fire Creek with Sadlerochit River, 69 deg 31'45"N, 145 deg 12'W, northeastern AK",""
"Shuttle Meadow","Jurassic","New England province","CT,MA"
"Siebert Tuff","Miocene","Great Basin province","NV",""
"Signal Point Shale","Pennsylvanian,Lower","Appalachian basin","AL,GA,TN","Gizzard Group",""
"Siletz River","Eocene","Western Columbia basin","OR"
"Silica","Devonian,Middle","Michigan basin","IN,MI,OH",""
"Silver Creek Limestone","Devonian,Middle","Cincinnati arch","IN,KY","North Vernon Limestone",""
"Silver Lake","Precambrian","Northern Rocky Mountain region","WY","Phantom Lake Metamorphic Suite",""
"Silver Lake (OR)","Pleistocene,Lower","Great Basin Province","OR"
"Silver Peak","Pliocene","Sierra Nevada province","CA",""
"Silver Shale","Devonian","Orogrande basin","NM","(+Silver Shale (NM) considered abandoned?  Uncertain if still in use by the NM Geol. Survey.  Not used by the USGS.","
"Silverado","Devonian,Middle","Appalachian basin","MD,NY,OH,PA,WV","Irvine Park [Black Star Canyon 7.5-min quadrangle] northwestern Santa Ana Mountains, Orange Co, CA",""
"Silverado (California)","Paleocene,Upper","Penisular Ranges","CA"
"Skaneateles","Devonian,Middle","Appalachian basin","MD,NY,OH,PA"
"Skiatook Shale","Pennsylvanian,Upper","Chautauqua platform","OK"
"Skoki dolomite","Ordovician","Macdonald Plaform","AB,BC"
"Skull Creek","Cretaceous,Lower","Denver basin,Powder River basin,Williston basin","CO(ce),MT,ND,NE,SD,WY",
"Smithers","Jurassic,Lower-Jurassic,Middle",,"BC"
"Smithwick Shale","Pennsylvanian,Middle","Llano uplift,Bend arch","TX","Bend Group"
"Smoky Hill","Cretaceous,Upper","Central Kansas uplift,Anadarko basin,Denver basin","CO,KS,NE,NM","Niobrara Formation (WY","
"Snake Creek","Miocene, middle- Miocene, late","Denver basin","NE,WY","Ogallala Group",""
"Snake Hill","Ordovician,Middle","New England province","NY",""
"Sniabar Limestone","Pennsylvanian,Upper","Ozark uplift","IA,KS,MO","Hertha Formation",""
"Snow Hill","Cretaceous,Upper","Atlantic Coast basin","NC,sc","Black Creek Formation",""
"Snowshoe","Jurassic,Lower"-Jurassic,Middle","Eastern Columbia baisn","OR"
"Snyder Creek Shale","Devonian,Upper","Ozark uplift","MO",""
"Soldier Creek Limestone Shale","Pennsylvanian,Upper","Nemaha anticline","IA,KS,MO,NE,OK","Bern Limestone",""
"Sonyea","Devonian,Upper","Appalachian basin","MD,NY,OH,PA,WV",""
"Soudan","Precambrian","Lake Superior region","MN","Ely Greenstone",""
"Souris River","Devonian,Middle(?)- Devonian,Upper","Williston basin,Big Horn basin,Powder River basin,Central Montana uplift,Montana folded belt province,Sweetgrass arch","mb,MT,ND,SD,WY",""
"South Bend Limestone","Pennsylvanian,Upper","Nemaha anticline","KS,NE,tx","Stanton Limestone",""
"Southesk Dolomite","Devonian",,"AB"
"Speed","Devonian,Middle","Cincinnati arch","IN"
"Spence shale","Cambrian,Middle","Wasatch uplift","ID,UT"
"Spencer","Eocene","Western Columbia basin","OR",""
"Spoon","Pennsylvanian,Middle","Illinois basin","IL,IN,KY","Kewanee Group",""
"Spotted Ridge","Pennsylvanian,Lower","Snake River basin","OR",""
"Spray","Cretaceous,Upper","Vancouver Is","BC","Nanaimo group"
"Spray River","Triassic,Middle- Triassic,Lower","Montana folded belt province","ab,MT",""
"Springdale Sandstone","Jurassic,Lower","Great Basin province,Black Mesa basin,Plateau sedimentary province","AZ,NV,UT","Moenave Formation of Glen Canyon Group",""
"Springfield Dolomite","Silurian, middle","Cincinnati arch","OH",""
"St Albans Slate","Cambrian,Middle","New England province","VT",""
"St Charles Limestone","Cambrian,Upper-Ordovician,Lower","Wasatch uplift,Great Basin province,Snake River basin","ID,UT"
"St Clair Limestone","Silurian","Arkoma basin,Illinois basin,Ozark uplift,Upper Mississippi embayment","AR,IL,IN,KY,MO,OK",""
"St Croix","Silurian",,"MN"
"St David Limestone","Pennsylvanian,Middle","Illinois basin","IL","Carbondale Formation",""
"St David (Arizona)","Pliocene-Pleistocene","SouthEast Arizona","AZ"
"St Genevieve","Mississippian",,"al,ga,il,IN,ky,MO"
"St Johns","Cambrain",,"NB"
"St Lawrence Dolomite","Cambrian,Upper","Wisconsin arch,Sioux uplift","IA,MI,MN,WI","Trempealeau Group",""
"St Louis","Mississippian,Upper","Ozark uplift,Illinois basin,Cincinnati arch,Appalachian basin","CO (subsurface),GA,IA,IL,IN,KS,KY,MO,OK,TN,TX,VA",""
"St Mary River","Cretaceous,Upper","Montana folded belt province","ab,MT",""
"St Marys","Miocene, middle- Miocene, late","Atlantic Coast basin","DE,MD,NC,VA","Chesapeake Group",""
"St Peter Sandstone","Ordovician,Middle","Sioux uplift,Wisconsin arch,Illinois basin,Iowa shelf,Cincinnati arch,Appalachian basin,Ozark uplift,Williston basin,Upper Mississippi embayment,Arkoma basin,Salina basin,Forest City basin,Nemaha anticline","AR,IA,IL,IN,KS (subsurface),KY,MI,MN,MO,NE,OH,OK,SD,WI,WV",""
"St Piran Sandstone","Cambrian,Lower","Canadian Rockies","BC"
"Stanbridge Slate","Ordovician,Upper- Ordovician,Middle","New England province","qc,VT",""
"Standpipe","Permian,Lower","Bend arch","TX"
"Stanton Limestone","Pennsylvanian,Upper","Nemaha anticline","IA,KS,MO,NE,OK","Lansing Group",""
"Stark Shale","Pennsylvanian,Upper","Cherokee basin,Forest City basin","IA,KS,MO,NE"
"Stark (NY)","Precambrian- Proterozoic,Middle","Adirondack uplift","NY",""
"State Quarry","Devonian,Middle","Iowa shelf","IA","Cedar Valley Group"
"Staunton","Pennsylvanian,Middle","Illinois basin","IN"
"Stephen","Cambrain,Middle",,"BC"
"Stephens Sandstone Slate","Pennsylvanian,Middle","Appalachian basin","TN","Slatestone Formation",""
"Steuben","Ordovician,Middle","Appalachian basin","NY"
"Steves Farm","Ordovician,Early","New England province","NY"
"Stewartville Dolomite","Ordovician,Middle- Ordovician,Upper","Sioux uplift,Iowa shelf,Wisconsin arch","IA,IL,MN,MO,WI","Galena Dolomite",""
"Stinking Spring Conglomerate","","Great Basin province","NV",""
"Stinking Water","Cenozoic,Middle","Great Basin Province","NV,or"
"Stirling Quartzite","Ediacaran","Great Basin Province","CA,NV"
"Stockton","Triassic,Upper","Piedmont-Blue Ridge province,Newark basin","NJ,NY,PA","the Newark Supergroup",""
"Stone City","Eocene","Gulf Coast basin,East Texas basin","TX","Claiborne Group",""
"Stonehenge Limestone","Cambrian,Upper(?)- Ordovician,Lower","Appalachian basin","MD,NJ,NY,PA,VA,WV","Beekmantown Group"
"Stonehouse","Silurian",,"NS"
"Stonehouse Canyon","Pennsylvanian,Lower","Williston basin,Powder River basin,Central Montana uplift","MT,ND","Tyler Formation",""
"Stoner Limestone","Pennsylvanian,Upper","Nemaha anticline","IA,KS,MO,NE","Stanton Limestone of Lansing Group",""
"Stones River","Ordovician,Middle","Appalachian basin,Cincinnati arch,Black Warrior basin","AL,GA,MS,TN,va",""
"Stonington","Ordovician, Upper","Michigan Basin","MI"
"Stonington (ME)","Mississippian","New England province","ME",""
"Stony Mountain Shale","Ordovician,"Upper","Powder River basin,Williston basin","mb,MT,WY","Bighorn Group"
"Stony Point Shale","Ordovician,Middle","Adirondack uplift","NY,VT","Trenton Group"
"Stormville","Devonian,Lower","Appalachian basin","NJ,PA",""
"Stranger","Pennsylvanian,Upper","Forest City basin","KS,MO,NE","Douglas Group",""
"Stuart Bay","Devonian,Lower","Bathurst Is","NU"
"Stuart Shale","Pennsylvanian,Middle","Arkoma basin","OK","Krebs Group",""
"Stull Shale","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Kanwaka Shale",""
"Sturrock","Cretaceous",,"AB","Sturrock member of the Cardium formation"
"Sucker Creek","Miocene","Snake River basin","ID,OR","","(+Sucker Creek Formation (ID,OR) amended to Succor Creek Formation to conform with spelling of Board on Geographic Names.  See Succor Creek.","
"Sugar River","Ordovician,Middle","Appalachian basin","NY"
"Sullivan (Canada) Shale","Cambrian,Middle-Cambrian,Upper","Canadian Rockies","AB"
"Sullivan Siltstone","Cambrian,Upper","Ozark uplift","MO","Bonneterre Formation",""
"Sulphur Canyon Sandstone","Cretaceous,Upper","Paradox basin","UT","Neslen Formation of Mesaverde Group",""
"Sulphur Mountain","Triassic","Wapiti Lake area","BC"
"Sundance","Jurassic,Upper- Jurassic,Middle","Big Horn basin,Central Montana uplift,Chadron arch,Denver basin,Green River basin,Montana folded belt province,North Park basin,Powder River basin,Sioux uplift,Uinta basin,Williston basin,Wind River basin","CO,ID,MT,NE,SD,UT,WY",""
"Sunrise","Cretaceous","Alaska Southern region","AK","(+Sunrise Group (AK) considered same as /Valdez Group.  See Valdez.","
"Sunrise (NV)","Jurassic,Lower","Great Basin province","NV"
"Sunset","Ordovician,Upper","Cincinnati arch","in,KY,OH","Bull Fork Formation",""
"Supai","Mississippian,Upper (local)- Pennsylvanian,Lower- Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower","Basin and Range province,Black Mesa basin,Plateau sedimentary province,Salton basin,Great Basin province","AZ,CA,NV,UT",""
"Suwannee Limestone","Oligocene","South Georgia sedimentary province,Florida platform","FL,GA",""
"Swan Creek","Ordovician,Lower","Ozark Uplift","AR"
"Swan Peak Quartzite","Ordovician,Middle","Wasatch uplift,Great Basin province","UT,ID"
"Swasey Limestone","Cambrian,Middle","Great Basin province","NV,UT"
"Sweetland Creek","Devonian,Upper","Iowa shelf,Illinois basin","IA,IL"
"Swift Current","Ordovician","Georgian Bay area","ON"
"Swift Current (SK)","Eocene",,"sk"
"Swift Sandstone","Jurassic,Upper","Sweetgrass arch,Montana folded belt province,Central Montana uplift,Williston basin,Powder River basin,Big Horn basin,Chadron arch,Wind River basin","MT","Ellis Group"
"Sydney Coalfield","Carboniferous","Cape Breton","NS"
"Sykes Mountain","Cretaceous,Upper","Bighorn basin","MT,WY"
"Sylamore Sandstone","Devonian,Middle-Devonian,Upper","Arkoma basin,Illinois basin","AR,IL,MO,OK" 
"Sylvania","Devonian,Middle","Michigan basin","MI,OH",""
"Syracuse","Silurian,Upper","Appalachian basin","NY"
"Table Creek (NE)","Miocene","Nehama Anticline","IA,KS,MO,NE"
"Table Creek Shale","Miocene","Great Basin province","NV,UT",""
"Table Head","Ordovician,Middle","Western Newfoundland","NL"
"Table Point","Ordovician,Middle","Western Newfoundland","NL"
"Talbot","Pleistocene- Holocene","Atlantic Coast basin,South Georgia sedimentary province,Florida platform","FL,GA,MD,NC,SC,VA","Columbia Group",""
"Talladega Chert","Devonian,Lower(?)- Devonian,Middle(?)","Piedmont-Blue Ridge province","AL,GA,NC,TN",""
"Tamiami","Pliocene, early- Pliocene, late","South Georgia sedimentary province,Florida platform","FL",""
"Tampa Limestone","Oligocene, late- Miocene, early","Florida platform","AL,FL",""
"Tank Hill Limestone","Ordovician,Lower","Great Basin province","NV",""
"Tapeats Sandstone","Cambrian,Lower- Cambrian,Middle (local)","Plateau sedimentary province,Basin and Range province,Salton basin,Great Basin province,Mojave basin","AZ,CA,NV,UT","Tonto Group",""
"Tar Springs","Mississippian,Upper","Illinois basin,Ozark uplift","IL,IN,KY,MO",""
"Tarheel","Miocene",,"OR"
"Tarkio Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE","Zeandale Limestone",""
"Tarratine","Devonian,Lower","New England province","ME"
"Tate","Ordovician,Upper","Cincinnati arch","KY,OH","Ashlock Formation",""
"Taylor Marl","Cretaceous,Upper","Ouachita folded belt,East Texas basin","ar,LA,TX"
"Taylorsville","Silurian","Sierra Nevada province","CA","",""
"Tebo","Pennsylvanian,Middle","Forest City basin","KS,MO","Cabaniss Group",""
"Tecovas","Triassic,Upper","Anadarko basin,Palo Duro basin,Permian basin","NM?,TX","Dockum Group",""
"Teepee Butte","Miocene","Eastern Columbia basin,Idaho Mountains province","ID,OR,WA","Grande Ronde Basalt of /Columbia River Basalt Group",""
"Teepee Trail","Eocene","Wind River basin","WY"
"Tejon","Eocene, early- Eocene, middle- Eocene, late(?)","San Joaquin basin","CA",""
"Telegraph Canyon Dolomite","Devonian,Middle","Great Basin province","NV","(+Telegraph Canyon Formation (NV) replaced with Sentinel Mountain Dolomite.  See Sentinel Mountain.","
"Temblor","Miocene- Oligocene","San Joaquin basin","CA",""
"Temple Butte Limestone","Devonian,Lower","Plateau sedimentary province,Black Mesa basin","AZ
"Ten Mile","Cretaceous,Upper","Sacramento Basin","CA","Chico"
"Tenmile Creek Dolomite","Devonian,Middle","Appalachian basin","in,MI,OH",""
"Terrill","Ordovician,Upper","Cincinnati arch","KY","Ashlock Formation",""
"Tesuque","Miocene","San Juan basin,Estancia basin","NM","Santa Fe Group",""
"Thaynes","Triassic,Lower","Wasatch uplift,Uinta uplift,Uinta basin,Green River basin,Snake River basin,Yellowstone province","ID,MT,NV,UT,WY",""
"The Dalles","Pliocene,Middle",,"OR"
"Theresa","Cambrian,Upper- Ordovician,Lower","Appalachian basin,New England province","NY,PA,VT",""
"Thousand Creek","Pliocene","Great Basin province","NV,OR",""
"Three Forks","Devonian,Upper- Mississippian(?) (local)","Montana folded belt province,Sweetgrass arch,Central Montana uplift,Yellowstone province,Williston basin,Big Horn basin,Wind River basin,Green River basin,Idaho Mountains province,Snake River basin","ID,MT,ND,SD,UT,WY",""
"Thrifty Limestone","Pennsylvanian,Upper","Bend arch,Fort Worth syncline","TX","Cisco Group"
"Thunder Bay Limestone","Devonian,Middle","Michigan basin","MI","Traverse Group"
"Timber Creek","Eocene","Atlantic Coast basin","NJ","(+Timber Creek beds (NJ) abandoned.","
"Timms Point","Pleistocene","Los Angeles basin","CA",""
"Timpas Limestone","Cretaceous,Upper","Denver basin,Las Animas arch,Las Vegas-Raton basin","CO","","(+Timpas Limestone (CO) replaced with Fort Hays Limestone Member of Niobrara Formation.  See Fort Hays.","
"Tin Mountain Limestone","Mississippian,Lower","Great Basin province","CA",""
"Tindir (Alaska)","Proterozoic,Upper-Cambrian","East Central Alaska","AK"
"Tindir","Cretaceous,Upper","Atlantic Coast basin","NJ,PA",""
"Tinton","Cretaceous,Upper","Atlantic Coast basin","NJ,PA"
"Tippecanoe","Ordovician,Middle",,"ny","Tippecanoe sequence"
"Tivola Limestone","Eocene, late","South Georgia sedimentary province","GA",""
"Toad","Lower,Triassic","Northeast BC","BC"
"Todlito Limestone","Jurassic","Great Basin province","AZ,nm,UT","Todlito member of the Morrison formation"
"Tokio","Cretaceous,Upper","Ouachita folded belt,Arkla basin","AR,LA,OK",""
"Tomahawk","Triassic,Upper",,"VA","No citations for this formation"
"Tomahawk Creek","Precambrian(?)- Proterozoic,Upper(?)- Cambrian(?)","Piedmont-Blue Ridge province","VA",""
"Tombigbee Sand","Cretaceous,Upper","Black Warrior basin","AL,GA,MS,TN","the Eutaw Formation",""
"Tonoloway","Silurian,Upper","Appalachian basin","MD,PA,VA,WV",""
"Tonto Sandstone Limestone Shale","Cambrian,Lower-Cambrian,Middle","Plateau sedimentary province","AZ"
"Topanga","Miocene, middle","Transverse Ranges province","CA",
"Topeka Limestone","Pennsylvanian,Upper","Forest City basin","IA,KS,MO,NE,OK","Shawnee Group",""
"Torok","Cretaceous,Lower","Alaska Northern region","AK",""
"Toroweap","Permian,Lower","Plateau sedimentary province,Great Basin province,Paradox basin,Wasatch uplift","AZ,NV,UT",""
"Torrejon","Paleocene- Paleocene","San Juan basin","AZ?,NM","Nacimiento Group","(+Torrejon Formation of Nacimiento Group (NM*) considered abandoned.  Regarded as faunal zone in Nacimiento Formation and provincial mammalian age Torrejonian.  See Nacimiento and Torrejonian.","
"Torrey","Triassic,Lower","Paradox basin","UT","Moenkopi Formation",""
"Torrey (California)","Eocene,Middle","Peninsular Ranges province","CA","La Jolla Group"
"Tounge River","Eocene",,"WY,MT","Tounge River member of the Fort Union formation"
"Towaco","Jurassic,Lower","Piedmont-Blue Ridge province,Newark basin","NJ","Brunswick Group",""
"Tower","Eocene","Green River basin","WY"
"Towsley","Miocene-Pliocene,Lower","Los Angeles Basin","CA"
"Tranquille","Eocene","West of Kamloops","BC"
"Traverse Group","Devonian,Middle","Michigan basin","IN,MI",
"Trent Marl","Oligocene","Atlantic Coast basin","NC",""
"Trenton","Ordovician,Middle- Ordovician,Upper","Appalachian basin,New England province,Michigan basin,Illinois basin,Cincinnati arch","GA,IL,IN,KY,ME,MI,mn,NJ,NY,OH,on,PA,qc,TN,VA,VT,wi,WV",""
"Triangle","Devonian,Upper","Appalachian basin","NY"
"Tribes Hill Limestone","Ordovician,Lower","Appalachian basin","NY"
"Trimmers Rock","Devonian,Upper","Appalachian basin","PA","Susquehanna Group",""
"Trinity Sand","Cretaceous,Lower","Ouachita folded belt,Arkla basin,East Texas basin","AR,OK,LA,TX"
"Trout Creek","Cretaceous,Upper","Green River basin,Piceance basin","CO","Mesaverde Group"
"Trout Creek (OR)","Miocene",,"OR"
"Trout Valley","Devonian,Lower- Devonian,Middle","New England province","ME",""
"Trowbridge","Jurassic,Middle","Blue Mountains province","OR"
"Trujillo","Triassic,Upper","Anadarko basin,Palo Duro basin,Permian basin,Las Vegas-Raton basin","NM,TX","Dockum Group",""
"Tuktu","Cretaceous,Lower","Alaska Northern region","AK","Nanushuk Group","(+Tuktu Formation of Nanushuk Group (AK*) abandoned.  Rocks reallocated to lower (marine) Nanushuk Formation.  See Nanushuk.","
"Tulare","Pliocene- Pleistocene","San Joaquin basin","CA",""
"Tullock","Paleocene,Lower","Williston basin,Powder River basin,Central Montana uplift","MT,ND?,SD?,WY"
"Tully Limestone","Devonian,Middle","Appalachian basin","MD,NY,OH,PA,WV",""
"Tunnel Point","Eocene-Oligocene","Western Columbia basin","OR"
"Tunuck Shale","Cretaceous,Upper",,"az,UT,CO","Tunuck member of Mancos Shale"
"Turlock Lake","Pleistocene","San Joaquin basin","CA",""
"Turners Falls Sandstone","Jurassic,Lower","New England province,Northfield basin,Deerfield basin","MA","Newark Supergroup",""
"Turtle Butte","Miocene","Sioux uplift","NE,SD",""
"Tuscaloosa","Cretaceous,Upper","Black Warrior basin,Mid-Gulf Coast basin,Gulf Coast basin,South Georgia sedimentary province,Florida platform,Upper Mississippi embayment,Illinois basin","AL,AR,FL,GA,IL,KY,LA,MS,sc,TN",""
"Tuscumbia Limestone","Mississippian,Upper","Black Warrior basin,Appalachian basin","AL,GA,MS",""
"Twiggs Clay","Eocene, late","South Georgia sedimentary province","GA",""
"Twin Buttes","Eocene","Green River basin","WY","Bridger"
"Twin Creek Limestone","Jurassic,Middle","Uinto Uplift,Uinta basin,Yellowstone province,Snake River basin","ID,UT,WY"
"Twin Knobs","Cambrian,Middle","Snake Miver basin","ID,UT"
"Twin River","Eocene,Upper,Miocene,Lower","Olympic Mountains province","WA"
"Twist Gulch","Jurassic,Middle","Wasatch Uplift,Great Basin province","UT"
"Two Medicine","Cretaceous,Late","Montana folded belt province,Sweetgrass arch","MT"
"Tyee Sandstone","Eocene","Western Columbia Basin","OR"
"Tymochtee","Silurian,Upper","Appalachian basin","MI,OH","Bass Islands Group",""
"Uinta","Eocene, late","Uinta basin,Green River basin,Piceance basin","CO,UT,wy",""
"Uintan","Eocene,Middle-Eocene,Upper",,
"Umpqua","Eocene,Lower-Eocene,Middle","Oregon-Washington Coast Ranges province,Klamath Mountains province","CA,OR"
"Unadilla","Devonian,Upper","Appalachian basin","NY","Genesee Group",""
"Underhill","Precambrian- Proterozoic,Upper- Cambrian,Lower","New England province","VT",""
"Union Wash","Triassic,Lower- Triassic,Middle(?)","Great Basin province","CA",""
"Ute","Cambrian,Middle","Wasatch uplift","ID,UT"
"Utica Shale","Ordovician,Middle- Ordovician,Upper","Appalachian basin,Michigan basin,Cincinnati arch","IN,MI,NY,OH,on,PA,vt",""
"Valcour","Ordovician,Middle","New England province","NY,VT","Chazy Group",""
"Valentine","Miocene","Chadron arch,Salina basin","KS,NE,SD"
"Valentine (PA)","Ordovician,Middle","Appalachian basin","PA","Benner Formation",""
"Valhalla","Ordovician,Lower?",,"BC?"
"Valmy","Ordovician- Cambrian,Upper","Great Basin province","NV",""
"Van Bibber Shale","Cretaceous,Lower","Denver basin","CO(ce)","South Platte Formation of Dakota Group",""
"Vandover?","Pennsylvanian",,"GA?"
"Vanport Limestone","Pennsylvanian,Middle","Appalachian basin","KY,OH,PA,WV","Allegheny Group",""
"Vaqueros","Oligocene, late- Miocene","California Coast Ranges province","CA",""
"Vaureal","Ordovician,Upper","St Lawrence Lowland,Anticosti","QC"
"Vermillion River","Cretaceous",,"MB"
"Vernon","Silurian,Upper","Appalachian basin","NY","Salina Group",""
"Verulam","Ordovician,Middle","Appalachian basin","on,PA,qc",""
"Vicksburg","Oligocene, early","Mid-Gulf Coast basin,Gulf Coast basin,South Georgia sedimentary province","AL,GA,LA,MS,TX",""
"Vilas Shale","Pennsylvanian,Upper","Cherokee basin","IA,KS,MO,NE","Lansing Group",""
"Vimy","Cretaceous",,"AB"
"Vincentown","Paleocene, late- Paleocene, late","Atlantic Coast basin","DE,MD,NJ","Rancocas Group",""
"Vinland Shale","Pennsylvanian,Upper","Forest City basin","KS,MO","Stranger Formation",""
"Viola","Ordovician,Upper","Anadarko basin,South Oklahoma folded belt,Ouachita folded belt,Sedgwick basin","CO (subsurface),KS (subsurface),OK",""
"Vishnu Schist","Precambrian","Southern Rocky Mountain region","AZ"
"Waawaa","Pleistocene","Hawaii","HI"
"Waccamaw","Pliocene, late- Pleistocene, early","Atlantic Coast basin","NC,SC","","(n)*<br/>
"Waco Shale","Silurian, middle","Cincinnati arch","KY,OH","Alger Shale",""
"Wahweap","Cretaceous,Upper","Plateau sedimentary province,Paradox basin","UT"
"Waldron Shale","Silurian- Silurian, middle","Cincinnati arch","IN,KY,TN",""
"Wall Creek Sandstone","Cretaceous,Upper","Chadron arch,big Horn basin,Williston basin,Green River basin,Wind River basin,Powder River basin","SD,UT,WY"
"Wallala",Cretaceous","Sacramento Valley","CA"
"Walnut Clay","Cretaceous,Lower","Ouachita folded belt,Arkla basin,East Texas basin,Strawn basin,Llano uplift,Kerr basin,Permian basin,South Oklahoma folded belt,Fort Worth syncline","AR,LA,NM,OK,TX","Fredericksburg Group",""
"Wanakah (NY)","Devonian,Middle","Appalachian basin","NY"
"Wanakah","Jurassic,Middle","Paradox basin,Black Mesa basin,San Juan basin,San Juan Mountains province,Piceance basin,Las Vegas-Raton basin","AZ,CO,NM,UT"
"Wapanucka Limestone","Pennsylvanian,Lower-Pennsylvanian,Middle","Arkoma basin,Ouachita folded belt,South Oklahoma folded belt","OK"
"Wapiabi","Cretaceous,Upper","Sweetgrass arch","ab,MT",
"Wapiti","Eocene, early middle","Big Horn basin,Yellowstone province","ab,WY","Sunlight Group of Absaroka Supergroup",""
"Wapsipinicon","Devonian,Middle","Iowa shelf,Wisconsin arch","IA,IL,MN,MO (subsurface)",""
"Warley Hill","Eocene, middle","Atlantic Coast basin","NC,SC",""
"Warsaw","Mississippian,Upper","Illinois basin,Ozark uplift,Anadarko basin","CO,IA,IL,in,KS,KY,MO,TN",""
"Wasatch Limestone Dolomite","Devonian","Wasatch uplift","co,UT","(+Wasatch Limestone (UT) abandoned.  Replaced with Brazer Limestone, Madison Limestone, Threeforks [Three Forks] Limestone, Jefferson Dolomite, Laketown Dolomite, and Fish Haven Dolomite.  See Brazer, Madison, Three Forks, Jefferson, Laketown, and Fish Haven.","
"Wasatch (WY)","Paleocene-Eocene","Wasatch uplift,Uinta uplift,Green River basin,Piceance basin,Powder River basin","CO,ID,NM,UT,WY"wy"
"Washakie","Eocene","Green River basin","WY"
"Washington","Pennsylvanian,Upper- Permian,Lower","Appalachian basin","MD,OH,PA,WV","Dunkard Group",""
"Washington (NY)","Cambrian","Taconic Slice","NY"
"Washita","Cretaceous","Permian basin,Gulf Coast basin,Arkla basin,East Texas basin,Strawn basin,Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt,Orogrande basin","AR,LA,OK,TX"
"Water Canyon","Devonian,Lower","Wasatch uplift,Great Basin province","ID,UT"
"Waterways","Devonian,Upper",,"AB"
"Waverly (IA) Sandstone","Mississippian",,"IA,ks"
"Waverly Gneiss",,"Piedmont-Blue Ridge province","AL","Dadeville Complex"
"Wayan","Cretaceous,Lower","Green River basin,Snake River basin,Wasatch uplift","ID,WY"
"Wayland Shale","Pennsylvanian,Upper","Bend arch","TX","Cisco Group",""
"Waynesville","Ordovician,Upper","Cincinnati arch","in,OH",""
"Wea Shale","Pennsylvanian,Upper","Forest City Basin","IA,KS,MO,NE"
"Weaverville","Oligocene","Klamath Mountains province","CA",""
"Weber Sandstone","Pennsylvanian,Middle- Pennsylvanian,Upper- Permian,Lower","Wasatch uplift,Uinta uplift,Uinta basin,Green River basin,Piceance basin,Eagle basin","CO,UT,WY",""
"Weeks Limestone","Cambrian,Middle- Cambrian,Upper","Great Basin province","UT",""
"Welches","Cretaceous?","Nueces River basin","TX"
"Welden Limestone","MIssissippian","South Oklahoma folded belt","OK"
"Wellington","Permian,Lower","Sedgwick basin,Anadarko basin,Chautauqua platform","CO?,KS,OK","Sumner Group"
"Wemakah","Jurassic?",,"NM",,"Possibly a typo-but for what?"
"Weno Limestone Clay","Cretaceous,Lower","Fort Worth syncline,South Oklahoma folded belt,Ouachita folded belt","OK,TX"
"Wenonah","Cretaceous,Upper","Atlantic Coast basin","DE,NJ","Matawan Group"
"Weskan Shale","Cretaceous,Upper","Anadarko basin","KS","Pierre Shale",""
"West Arm","Pennsylvanian,Middle","South Oklahoma folded belt","OK","Deese Group",""
"West Bridgewater","Ordovician,Middle","New England province","VT"
"West Castleton","Precambrian- Proterozoic,Upper- Cambrian,Lower- Cambrian,Middle","New England province","NY,VT",""
"West Falls","Devonian,Upper","Appalachian basin","KY,NY,OH,PA,TN,VA,WV",""
"West Hill","Devonian,Upper","Appalachian basin","NY.pa","West Falls Group",""
"West Union","Pleistocene","Sioux uplift","MN",""
"West Union (KY)","Silurian",,"ky,oh"
"Westerville Limestone","Pennsylvanian,Upper","Iowa shelf","IA,KS,MO,NE","Kansas City Group",""
"Wetumka Shale","Pennsylvanian,Middle","Arkoma basin,Ouachita folded belt","OK"
"Wewoka","Pennsylvanian,Middle","Arkoma basin,Ouachita folded belt,Chautauqua platform","OK"
"Weymouth","Cambrian,Lower","New England province","MA,RI",
"Wheeler","Cambrian,Middle","Great Basin province","UT",""
"Whitby Shale","Ordovician","Southern Ontario","ON"
"White Bluff","Eocene","Desha basin","AR","Jackson Group",""
"White Cloud Shale","Pennsylvanian,Upper","Forest City basin,Nemaha anticline","IA,KS,MO,NE,OK","Scranton Shale",""
"White River","Eocene,Upper-Oligocene","Wind River basin,Denver basin,Sioux uplift,Chadron arch,Williston basin","CO,MT,ND,NE,SD,WY"
"White Limestone (Alabama)","Cretaceous",,"al","19th Century term"
"White","Cretaceous,Upper","Eagle basin","CO","","(+White Porphyry (CO) replaced with Pando Porphyry?  Uncertain if White Porphyry or Pando Porphyry is the preferred name of the CO Geol. Survey.  See also Pando.  Abandoned by the USGS.","
"Whitehall","Cambrian,Upper- Ordovician,Lower","New England province","NY,VT",""
"Whitesburg Limestone","Ordovician,Middle","Appalachian basin","TN,VA",""
"Whitewater","Ordovician,Upper","Cincinnati arch","IN,ky,OH",""
"Whitney (NE)","Miocene",,"NE","Brule formation"
"Whitney","Cretaceous,Upper","Serra Nevada province","CA"
"Whittaker","Ordovician,Upper-Silurian,Lower","Makenzie Mts","NT,YT"
"Wichita","Permian,Lower","Palo Duro basin,Bend arch,Fort Worth syncline","OK,TX"
"Widder","Devonian,Middle","SouthWest Ontario","ON"
"Wiggins","Eocene,Middle-Eocene,Upper","Yellowstone province,Wind River basin,Big Horn basin","WY"
"Wilcox","Paleocene (local)- Paleocene (local)- Eocene- Eocene(?)","Gulf Coast basin,Ouachita folded belt,Arkla basin,East Texas basin,Mid-Gulf Coast basin,Black Warrior basin,South Georgia sedimentary province,Upper Mississippi embayment,Illinois basin","AL,AR,GA,IL,KY,LA,MO,MS,TN,TX",""
"Wild Cow","Pennsylvanian,Upper","San Juan basin,Estancia basin","NM(cw)","Madera Group",""
"Wilkes","Miocene","Western Columbia basin","WA",""
"Wilkie Brook","Mississippian","Cape Breton Is","NS"
"Wilkie Ranch","Eocene, early- Eocene, middle","Green River basin","CO,WY",""
"Wilkins Peak","Eocene,Lower-Eocene,Middle","Green River basin","CO,WY"
"Williams Is","Devonian,Upper","Moose River basin","ON"
"Williams","Cretaceous,Upper","Peninsular Ranges province","CA"
"Williamsburg","Paleocene,Upper-Eocene,Lower","Atlantic Coast basin","SC","","Black Mingo Group"
"Williamson Shale","Silurian- Silurian,Lower","Appalachian basin","NY","Clinton Group",""
"Williamstown","Devonian","New England province","VT",""
"Williamsville Dolomite","Silurian,Upper","Appalachian basin","NY.on","Bertie Formation",""
"Willow Creek","Cretaceous,Upper- Paleocene- Paleocene","Montana folded belt province,Sweetgrass arch","ab,MT",""
"Willowvale shale","Silurian,Lower-Silurian,Middle","Applachian basin","NY"
"Willwood","Eocene, early","Wind River basin","WY",""
"Wind River","Eocene,Lower","Wind River basin","WY"
"Windmill Limestone","Devonian,Lower","Great Basin province","NV",""
"Windom Shale","Devonian,Middle","Appalachian basin","NY,PA",""
"Windsor","Pliocene, late- Pleistocene, early","Atlantic Coast basin","VA",""
"Winfield Limestone","Permian,Lower","Nemaha anticline,Sedgwick basin","IA?,KS,NE,OK?","Chase Group",""
"Wingate Sandstone","Jurassic,Lower","Black Mesa basin,Plateau sedimentary province,Paradox basin,San Juan basin","AZ,CO,NM,UT","Glen Canyon Group",""
"Winterset Limestone","Pennsylvanian,Upper","Iowa shelf","IA,KS,MO,NE,OK","Kansas City Group",""
"Wiscoy Sandstone","Devonian,Upper","Appalachian basin","NY,PA"
"Wolfville sandstone","Triassic,Upper",,"NS","Fundy Group"
"Wolsey","Cambrian,Middle","Wind River basin,Williston basin,Big Horn basin,Central Montana uplift,Sweetgrass arch,Montana folded belt province,Yellowstone province","MT,WY"
"Womble Sandstone Shale","Ordovician,Middle","Ouachita folded belt","AR,OK"
"Wonewoc","Cambrian,Upper","Wisconsin arch,Iowa shelf","IA,WI","Elk Mound Group"
"Wood Canyon","Cambrian,Lower- Proterozoic,Upper","Great Basin province","CA,NV",""
"Woodbine","Cretaceous,Upper","East Texas basin,Arkla basin,Fort Worth syncline,Strawn basin,Ouachita folded belt,South Oklahoma folded belt","AR,LA,OK,TX",""
"Woodbury Clay","Cretaceous,Upper","Atlantic Coast basin","DE?,NJ"
"Woods Bluff","Eocene, early","Mid-Gulf Coast basin,South Georgia sedimentary province","AL,FL,GA,MS","Wilcox Group","=Bashi formation"
"Woods Corners","Cambrian,Upper- Cambrian,Middle","New England province","VT",""
"Woods Run","Pennsylvanian","Appalachian basin","NY,PA",,"No citations for Woods run formation"
"Woodside","Triassic,Lower","Uinta uplift,Wasatch uplift,Snake River basin,Green River basin","CO,ID,MT,UT,WY",""
"Worcester","Devonian,Lower- Silurian","New England province","MA",""
"Word","Permian,Lower","Permian basin","TX",""
"Wymps Gap Limestone","Mississippian,Upper","Appalachian basin","MD,PA,WV","Mauch Chunk Formation",""
"Yahatinda","Devonian,Middle",,"AB,BC"
"Yakoun","Jurassic,Middle","Coastal BC","BC"
"Yamhill","Eocene","Western Columbia basin","OR",""
"Yaquina","Oligocene,Upper-Miocene,lower","Western Columbia basin","OR"
"Yazoo Clay","Eocene, late","Mid-Gulf Coast basin,Gulf Coast basin,Arkla basin","AL,LA,MS,TX","Jackson Group",""
"Yegua","Eocene,Middle","Gulf Coast basin","LA,TX"
"Yeso","Permian,Lower","Permian basin,Orogrande basin,Las Vegas-Raton basin,San Juan basin,Estancia basin","NM,TX",""
"Yoder","Oligocene","Denver basin","WY"
"Yonna","Miocene,Upper-Pliocene,Lower","Great Basin province","OR"
"Yorktown","Pliocene- Pleistocene","Atlantic Coast basin","MD,NC,SC,VA","Chesapeake Group",""
"Zia sand","Eocene?","Estancia basin","NM"