POWDER RIVER BASIN DENVER BASIN HANNA BASIN BIGHORN BASIN WIND RIVER BASIN GREATER GREEN RIVER BASIN OVER- THRUST BELT Lava Creek B ash Ogallala Formation White River Fm Lower part Cgl Brule Fm Chadron Fm White River Group Precambrian rocks Lance Formation Fox Hills Sandstone Pierre Shale Belle Fourche Shale Greenhorn Formation Carlile Shale Niobrara Formation Mowry Shale Muddy Sandstone Thermopolis Shale Morrison Formation Lakota Formation Fall River Formation Inyan Kara Gp Sundance Formation Chugwater Formation of Darton (1908) Satanka Shale Forelle Limestone Fountain Fm Casper Formation Hartville Formation Englewood Limestone Guernsey Formation Fremont Canyon Sandstone ? ? Arikaree Formation Mesa Falls ash Bishop ash Miocene and Oligocene rocks White River Formation Lower Part Cgl Hanna Formation Wind River Formation Wagon Bed Formation Medicine Bow Formation Ferris Formation Fox Hills Sandstone Lewis Shale Mesaverde Group Almond Fm Pine Ridge Sandstone Rock River Formation Allen Ridge Fm Haystack Mountains Formation Frontier Formation Goose Egg Formation ? Sundance Formation Jelm Formation Chugwater Formation of Darton (1908) Forelle Limestone Satanka Shale Casper Formation Fountain Fm Madison Limestone Morrison Formation Cloverly Formation Mowry Shale Muddy Sandstone Thermopolis Shale Steele Shale Steele Shale Niobrara Formation Fremont Canyon Sandstone Precambrian rocks ? ? White River Formation Moncrief Mbr Kingsbury Cgl Mbr Wasatch Formation Tongue River Member Tullock Member Lebo Member Lance Formation Fort Union Formation Bearpaw Shale Lewis Shale Fox Hills Sandstone Cody Shale Teapot Ss Mbr Parkman Ss Mbr Sussex Ss Mbr Shannon Ss Mbr Pierre Shale Mowry Shale Mowry Shale Frontier Fm Niobrara Formation Carlile Shale Greenhorn Fm Belle Fourche Shale Muddy Ss Thermopolis Shale Newcastle Ss Skull Creek Shale Mesaverde Fm Cloverly Formation Morrison Formation Morrison Formation Sundance Formation Sundance Formation Gypsum Spring Fm Lakota Fm Fall River Fm Inyan Kara Gp Red Peak Fm or Mbr Alcova Ls or Ls Mbr Crow Mountain Ss or Ss Mbr Popo Agie Fm or Mbr Chugwater Group or Formation Goose Spearfish Egg Formation Formation Minnekahta Limestone Opeche Shale Tensleep Sandstone Amsden Formation Formation Minnelusa Madison Limestone Cottonwood Canyon Member Pahasapa Limestone Englewood Limestone Whitewood Dolomite Winnipeg Formation Bighorn Dolomite Precambrian rocks Flathead Ss Deadwood Formation Gallatin Limestone and equivalent ? ? ? Harding Ss equivalent Possible uppermost Minnelusa equivalent Goose Egg Formation ? Lava Creek B and A ash Ash at Shell Creek Canyon Aycross Formation Wapiti Fm Tatman Formation Willwood Formation Fort Union Formation Lance Formation Meeteetse Formation Lewis Sh Mesaverde Formation Cody Shale Teapot Ss Mbr Mowry Shale Frontier Formation Muddy Sandstone Thermopolis Shale Cloverly Formation Morrison Formation Sundance Formation Gypsum Spring Formation Dinwoody Formation Nugget Ss Red Peak Fm or Mbr Alcova Ls or Ls Mbr Crow Mountain Ss or Ss Mbr Popo Agie Fm or Mbr Chugwater Group or Formation Tensleep Sandstone Amsden Formation Madison Limestone Bighorn Dolomite Darby Formation Beartooth Butte Formation Flathead Sandstone Gros Ventre Formation Gallatin Limestone Phosphoria Formation and related rocks ? Lava Creek B and A ash Split Rock Formation Intrusive igneous rocks White River Formation Aycross Formation Tepee Trail Fm Eocene rocks Wagon Bed Fm Wind River Formation Indian Meadows Fm Precambrian rocks Lance Formation Meeteetse Formation Lower part Waltman Shale Member Shotgun Mbr Fort Union Fm Lewis Sh Teapot Sandstone Member Middle member Parkman Ss Mbr Fales Member Mesaverde Formation Wallace Creek T of Cody Shale Cody Shale Frontier Formation Mowry Shale Muddy Sandstone Thermopolis Shale Cloverly Formation Morrison Formation Sundance Formation Gypsum Spring Fm Nugget Sandstone Popo Agie Fm or Mbr Crow Mountain Ss or Ss Mbr Alcova Ls or Ls Mbr Red Peak Fm or Mbr Dinwoody Formation Goose Egg Formation Chugwater Group or Formation Phosphoria Formation and related rocks Tensleep Sandstone Amsden Formation Madison Limestone Darby Formation Bighorn Dolomite Gallatin Limestone Gros Ventre Formation Flathead Sandstone ? ? ? Lewis Shale ? Popo Agie Fm or Mbr Crow Mountain Ss or Ss Mbr Alcova Ls or Ls Mbr Red Peak Fm or Mbr Chugwater Group or Formation Popo Agie Fm or Mbr Crow Mountain Ss or Ss Mbr Alcova Ls or Ls Mbr Red Peak Fm or Mbr Chugwater Group or Formation Madison Limestone Lava Creek B ash Lava Creek B ash Lava Creek B ash Lava Creek B ash Salt Lake Formation White River Formation Miocene and Oligocene rocks Camp Davis Fm Teewinot Fm Conglomerate Browns Park Formation Miocene (?) rocks Split Rock Formation Browns Park Formation Bishop Conglomerate Bishop Conglomerate Bishop Conglomerate Ice Point Conglomerate Bridger Formation Bridger Formation Intrusive igneous rocks Fowkes Formation Laney Member Fm River Green Pass Peak Fm Wasatch Formation Wasatch Fm Green River Fm Main body of Wasatch Fm Diamictite and Sandstone Conglomerate of Sublette Range Wilkins Peak Member Cgl Cathedral Bluffs Tongue Cathedral Bluffs T Alkali Creek Tongue Main body of Wasatch Formation Niland Tongue Luman T Farson Ss Member Tipton Tongue Chappo Member Evanston Formation Hoback Fm Fort Union Formation Fort Union Formation Fort Union Formation Fort Union Formation Fort Union Formation Adobe Town Mbr Laney Member Green River Fm Cathedral Bluffs Tongue Battle Spring Formation Green River Fm Wasatch Fm Godiva Rim Mbr Wilkins Peak Member Tipton Shale Member Niland Tongue Luman Tongue Wasatch Fm Main body of Wasatch Formation Harebell Formation Lance Fm Lance Fm Lance Formation Lance Formation Fox Hills Sandstone Fox Hills Sandstone Fox Hills Sandstone Fox Hills Sandstone Meeteetse Formation Lewis Shale Lewis Shale Lewis Shale Lewis Shale Mesaverde Formation Almond Formation Almond Formation Almond Formation Almond Formation Ericson Ericson Sandstone Sandstone Rock Springs Formation Rock Springs Formation Mesaverde Mesaverde Mesaverde Mesaverde Group Group Group Group Blair Formation Blair Formation Haystack Mountains Formation Haystack Mountains Formation Pine Ridge Sandstone Pine Ridge Sandstone Allen Ridge Formation Allen Ridge Formation Adaville Formation Hilliard Shale Frontier Formation Frontier Formation Blind Bull Formation Frontier Formation Bacon Ridge Sandstone Sohare Formation Baxter Shale Baxter Shale Baxter Shale Cody Shale Frontier Formation Frontier Formation Frontier Formation Frontier Formation Madison Limestone Madison Limestone Madison Limestone Madison Limestone Mississippian rocks Madison Group Tensleep Sandstone Tensleep Sandstone Wells Formation Weber Sandstone Weber Sandstone Morgan Formation Morgan Formation Round Valley Limestone Round Valley Limestone Amsden Formation Amsden Formation Tensleep Ss Amsden Formation Amsden Formation Phosphoria Formation and related rocks Phosphoria Formation and related rocks Phosphoria Formation and related rocks Phosphoria Formation and related rocks Phosphoria Formation and related rocks Phosphoria Formation and related rocks Goose Egg Formation ? Goose Egg Formation ? Dinwoody Formation Dinwoody Formation Dinwoody Formation Dinwoody Formation Dinwoody Formation Dinwoody Fm Dinwoody Fm Chugwater Formation Chugwater Formation Chugwater Formation Ankareh Formation Thaynes Limestone Woodside Shale Nugget Sandstone Nugget Sandstone Nugget Sandstone Nugget Sandstone Nugget Sandstone Nugget Sandstone Gypsum Spring Formation Gypsum Spring Formation Gypsum Spring Fm Sundance Formation Sundance Formation Sundance Formation Sundance Formation Sundance Formation Stump Formation Preuss Sandstone or Redbeds Twin Creek Limestone Ephraim Conglomerate Peterson Limestone Bechler Conglomerate Draney Limestone Smoot Formation Gannett Group Morrison Formation Cloverly Formation Morrison Formation Cloverly Formation Morrison Formation Cloverly Formation Morrison Formation Cloverly Formation Morrison Formation Cloverly Formation Wayan Formation Smiths Formation Thomas Fork Fm Cokeville Fm Quealy Fm Sage Junction Formation Bear River Fm Aspen Shale Aspen Shale Bear River Formation Mowry Shale Muddy Sandstone Thermopolis Shale Mowry Shale Muddy Sandstone Thermopolis Shale Mowry Shale Muddy Sandstone Thermopolis Shale Mowry Shale Muddy Sandstone Thermopolis Shale Cody Shale Steele Shale Niobrara Formation Darby Formation Darby Formation Darby Formation Darby Fm Darby Fm Laketown Dolomite Bighorn Dolomite Bighorn Dolomite Bighorn Dolomite Gallatin Limestone Gros Ventre Formation Flathead Sandstone Precambrian rocks Gallatin Limestone Gallatin Limestone Gallatin Limestone Gallatin Limestone Gros Ventre Formation Gros Ventre Formation Gros Ventre Formation Gros Ventre Formation Cambrian rocks Cambrian rocks Flathead Sandstone Flathead Sandstone Flathead Sandstone Flathead Sandstone Flathead Sandstone Flathead Sandstone Precambrian rocks Precambrian rocks Precambrian rocks Precambrian rocks Precambrian rocks Alkalic extrusive and intrusive rocks Washakie Fm Kinney Rim Mbr ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? SYSTEM AND SERIES Age (Ma) Holocene 0.01 QUATERNARY Pleistocene Pliocene 1.65 5 Miocene Oligocene 24 38 TERTIARY Eocene Paleocene 55 66 CRETACEOUS Upper Cretaceous Lower Cretaceous 96 138 ? Upper Jurassic Middle Jurassic JURASSIC (?) AND TRIASSIC (?) Upper Triassic Lower Triassic JURASSIC TRIASSIC 205 ~240 290 ~330 360 410 Upper Pennsylvanian Middle Pennsylvanian Lower Pennsylvanian Upper Mississippian Lower Mississippian Upper Devonian Lower Devonian PERMIAN PENNSYLVANIAN MISSISSIPPIAN DEVONIAN ORDOVICIAN CAMBRIAN SILU- RIAN Upper and Middle Silurian Upper Ordovician Middle Ordovician Lower Ordovician Upper Cambrian Lower Cambrian PRECAMBRIAN 435 500 ~570 C E N O Z O I C ERA M E S O Z O I C P A L E O Z O I C Permian Precambrian rocks South and East Rock Springs Uplift Great Divide Basin Washakie Basin North and West Green River Basin ? ? ? ? STRATIGRAPHIC NOMENCLATURE CHART OF THE LARAMIDE BASINS, WYOMING Love, J.D., Christiansen, A.C., and Ver Ploeg, A.J., comps.,1993, Stratigraphic chart showing Phanerozoic nomenclature for the State of Wyoming: Geological Survey of Wyoming [Wyoming State Geological Survey] Map Series MS-41. Oil > 500,000 Bbls Natural Gas > 1,000 MMcf Coalbed Natural Gas > 1,000 MMcf 2012 Production Cgl Conglomerate Mbr Member Fm Formation Sh Shale Gp Group Ss Sandstone Ls Limestone T Tongue Abbreviations used in the columns Unconformity (generally of regional extent) Rocks in subsurface only Hiatus REFERENCE EXPLANATION Modified from Love and others (1993)