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Home , Bearpaw Formation, Huckleberry Ridge Tuff, Indian Meadows Formation, Tatman Formation, Willwood Formation

WYOMING STATE GEOLOGICAL SURVEY Wind/Bighorn River Basin Plan II Plate V Thomas A. Drean, State Geologist Available Groundwater Determination Technical Memorandum Geologic units/ Lithostratigraphic units/ Hydrogeologic units { { { { { { { Plate{ I { { Plate{ III { Plate II Plates IV and X

Geologic unit lithostratigraphic unit(s) lithostratigraphic unit(s) as Hydrogeologic Unit named for their Wyoming and and Symbol Age & general lithology Wyoming state map unit Bighorn River Basin Wind River Basin equivalents Absaroka/Yellowstone Volcanic unit Absaroka/Yellowstone Volcanic unit Wyoming Montana** CENOZOIC UNITS Water Water Water (surface) Water (surface) Water (surface) Water (surface) Water (surface) Water Water Aqu

Ice – Glacial ice Glacial ice – Glacial ice – Ice – – –

Qa Qa - alluvium & Alluvium & colluvium Alluvium & colluvium Alluvium & colluvium Alluvium & colluvium Qa Qa colluvium

Qt Qt Pleistocene-Holocene unconsolidated Gravel, pediment, & fan deposits Gravel, pediment, & fan deposits Gravel, pediment, & fan deposits Gravel, pediment, & fan deposits Qt Qt deposits Aqu Quaternary unconsolidated deposit Aqu Quaternary unconsolidated deposit Qg Qg Pleistocene-Holocene glacial deposits Glacial deposits Glacial deposits Glacial deposits Glacial deposits aquifers aquifers Qg Qg

Qls – Pleistocene-Holocene landslide & Landslide deposits Landslide deposits Landslide deposits – Qls – – glacial drift

Qs – Pleistocene-Holocene dune sand & Dune sand & loess deposits – Dune sand & loess deposits – Qs – – – loess

Quaternary units Quaternary Ql – Pleistocene-Holocene clay, silt, & fine Playa lake or marine deposits – Playa lake or marine deposits – Ql – – – sand

Qu Qu Pleistocene-Holocene alluvium & Undivided surficial deposits Undivided surficial deposits – Undivided surficial deposits Qu Qu – Aqu Quaternary unconsolidated deposit colluvium deposits aquifers Qb – Pleistocene basalt & intrusive rocks Basalt flows & intrusive igneous Basalt flows & intrusive igneous Basalt flows & intrusive igneous – Qb – – undefined volcanic hydrogeologic undefined volcanic hydrogeologic rocks rocks rocks unit(s)2 unit(s)2 Qr – Pleistocene rhyolite & lava flow rocks Rhyolite flows, tuff, & intrusive Rhyolite flows, tuff, & intrusive – – Qr – – – Ayv igneous rocks igneous rocks Yellowstone Volcanic Group

QTg – -Pleistocene gravel deposit Terrace gravels Terrace gravels – – QTg – – – Aqu Quaternary unconsolidated deposit aquifers Thr Thr Pliocene rhyolite & tuff rocks Huckleberry Ridge Tuff of Huckleberry Ridge Tuff of – Huckleberry Ridge Tuff of Thr Thr – Ayv Yellowstone Group Yellowstone Group Yellowstone Group Yellowstone Volcanic Group

Tii – -Pliocene granitoid & basalt Intrusive & extrusive igneous rocks Intrusive & extrusive igneous rocks – – Tii – – – undefined volcanic hydrogeologic rocks unit(s)2 Tcv – Miocene-Pliocene dacitic & felsic Caldwell Canyon Volcanics – Caldwell Canyon Volcanics – Tcv – – – undefined volcanic hydrogeologic volcanic rocks unit(s)2 Tmu – Upper Miocene sandstone & claystone Upper Miocene rocks (undivided) – Upper Miocene rocks (undivided) – Tmu – – –

Tm – Miocene sandstone & conglomerate Miocene rocks (undivided) – Miocene rocks (undivided) – Tm – – – Asr Split Rock aquifer

Tml – Lower Miocene sandstone (includes Lower Miocene (undivided) Lower Miocene (undivided) Lower Miocene (undivided) – Tml – – undefined Tertiary hydrogeologic Split Rock Formation) unit(s)2 Twr – fine & medium-grained White River Formation White River Formation White River Formation – Twr – – Awh Awh mixed clastic White River aquifer White River aquifer

Ti Ti plutonic rocks Intrusive igneous rocks Intrusive igneous rocks Intrusive igneous rocks Intrusive igneous rocks Ti Ti undefined Tertiary hydrogeologic undefined Tertiary hydrogeologic unit(s) 2 unit(s) 2 Tts Tts Eocene andesitic & pyroclastic rocks Thorofare Creek & Sunlight Thorofare Creek & Sunlight – Thorofare Creek & Sunlight Tts Tts – Groups Groups Groups

Twi – Eocene mixed clastic/volcanic rocks Wiggins Formation Wiggins Formation Wiggins Formation – Twi – – Aav Absaroka Volcanic Supergroup Aav Absaroka Volcanic Supergroup

Ttl – Eocene mixed clastic/volcanic & Two Ocean & Langford Two Ocean & Langford – – Ttl – – – intermediate volcanic rocks Formations Formations

Tt – Eocene mixed clastic/volcanic & Tepee Trail Formation Tepee Trail Formation Tepee Trail Formation – Tt – – medium-grained mixed clastic undefined volcanic hydrogeologic Cwb Aycross-Wagon Bed confining Ta – Eocene mixed clastic/volcanic & fine- Aycross Formation Aycross Formation Aycross Formation – unit(s) 2 unit Ta – – grained mixed clastic

Ts Ts Eocene intermediate volcanic & basalt Cresent Hill Basalt of Sunlight Cresent Hill Basalt of Sunlight – Cresent Hill Basalt of Sunlight Ts Ts – rocks Group Group Group Aav Absaroka Volcanic Supergroup Ttp – Eocene trachyandesite rocks Trout Peak Trachyandesite Trout Peak Trachyandesite – – Ttp – – – Tertiary units

Twp Twp Eocene mixed clastic/volcanic & Wapiti Formation Wapiti Formation – Wapiti Formation Twp Twp – undefined volcanic hydrogeologic intermediate volcanic rocks unit(s) 2 Taw Taw Eocene mixed clastic/volcanic & Washburn Group Washburn Group – Washburn Group Taw Taw – Aav intermediate volcanic rocks Absaroka Volcanic Supergroup Twb – Eocene claystone & conglomerate Wagon Bed Formation Wagon Bed Formation Wagon Bed Formation – Aycross-Wagon Bed confining Twb – – Awb Wagon Bed aquifer Cwb unit Tv – Eocene conglomerate & mixed Volcanic conglomerate – Volcanic conglomerate – Tv – – – undefined volcanic hydrogeologic clastic/volcanic rocks unit(s) 2 Tcr – Eocene conglomerate Crandall Conglomerate Crandall Conglomerate – – Tcr – – – undefined Tertiary hydrogeologic unit(s)2 Twdr – Eocene claystone & siltstone Wind River Formation – Wind River Formation – Twrd – – – Awr Wind River aquifer

Twim – Eocene fine-grained mixed clastic & Wind River & Indian Meadows – Wind River & Indian Meadows – Twim – – – undifferentiated Tertiary geologic medium-grained mixed clastic rocks Formations Formations unit(s)1

Tim – Eocene fine-grained mixed clastic & Indian Meadows Formation Indian Meadows Formation – – Tim – medium-grained mixed clastic rocks Cim Indian Meadows confining unit undefined Tertiary hydrogeologic 2 Tta – Eocene fine-grained mixed clastic & Tatman Formation – – unit(s) Tta – – – oil rocks

Twl Twl Eocene fine-grained mixed clastic & Willwood Formation – Willwood Formation – Twl Twl medium-grained mixed clastic rocks Awl Willwood aquifer

Tfu Tfu sandstone & shale Fort Union Formation Fort Union Formation Fort Union Formation Fort Union Formation Tfu Tfu Afu Fort Union aquifer Afu Fort Union aquifer

TKu – Upper & Paleocene Sedimentary rocks – Sedimentary rocks – TKu – – – undifferentiated Tertiary geologic sandstone & shale unit(s)1 MESOZOIC UNITS Ki – Cretaceous plutonic rocks Intrusive igneous rocks Intrusive igneous rocks – – Ki – – –

Klc – Upper Cretaceous sandstone & Landslide Creek Formation Landslide Creek Formation – – Klc – – – undefined Mesozoic hydrogeologic conglomerate unit(s)2 Kha – Upper Cretaceous sandstone & Harebell Formation Harebell Formation – – Kha – – – conglomerate

Kl Kl Upper Cretaceous sandstone & shale Lance Formation Lance Formation Lance Formation Lance Formation Kl Kl Ala Lance aquifer Ala Lance aquifer

Klm – Upper Cretaceous medium-grained Lewis Shale & Bearpaw Formation Lewis Shale & Bearpaw Formation Lewis Shale & Bearpaw Formation – undifferentiated Mesozoic geologic undifferentiated Mesozoic geologic Klm – mixed clastic & fine-grained mixed – unit(s)1 unit(s)1 clastic rocks Km Km Upper Cretaceous sandstone & Meeteetse Formation Meeteetse Formation Meeteetse Formation Meeteetse Formation Km Amt Km claystones Meeteetse aquifer & confining unit

Kml – Upper Cretaceous medium-grained Meeteetse Formation & Lewis – Meeteetse Formation & Lewis – Kml – mixed clastic & fine-grained mixed Shale – Shale – Cml Meeteetse-Lewis confining unit clastic rocks Kle – Upper Cretaceous shale & sandstone Lewis Shale – Lewis Shale – Kle – – –

Ket – Upper Cretaceous sandstone & shale Everts Formation, Eagle Everts Formation, Eagle – – Ket – Sandstone, & Telegraph Creek Sandstone, & Telegraph Creek – –

Cretaceous Cretaceous units Formation Formation undefined Mesozoic hydrogeologic 2 Kb – Upper Cretaceous sandstone & coal Bacon Ridge Sandstone Bacon Ridge Sandstone – – unit(s) Kb – – –

Kmv Kmv Upper Cretaceous sandstone & shale Mesaverde Group Mesaverde Group Mesaverde Group Mesaverde Group Kmv Kmv Amv Mesaverde aquifer Amv Mesaverde aquifer

Kc Kc Upper Cretaceous shale & sandstone Cody Shale Cody Shale Cody Shale Cody Shale Kc Kc Cc Cody Shale confining unit Cc Cody Shale confining unit

Kf Kf Upper Cretaceous sandstone & shale Frontier Formation Frontier Formation Frontier Formation Frontier Formation Kf Kf Afr Frontier aquifer Afr Frontier aquifer

Kft – Upper-Lower Cretaceous sandstone & Frontier Formation, Mowry Shale, Frontier Formation, Mowry Shale, Frontier Formation, Mowry Shale, – Kft – – undifferentiated Mesozoic undifferentiated Mesozoic shale & Thermopolis Shale & Thermopolis Shale & Thermopolis Shale geologic unit(s) 1 geologic unit(s) 1 Kmt Kmt Lower Cretaceous shale & sandstone Mowry Shale, Muddy Sandstone, & Mowry Shale, Muddy Sandstone, & Mowry Shale, Muddy Sandstone, & Mowry Shale, Muddy Sandstone, & Kmt Kmt Ctm Ctm Thermopolis Shale Thermopolis Shale Thermopolis Shale Thermopolis Shale Thermopolis-Mowry confining unit Thermopolis-Mowry confining unit

KJ KJ -Lower Cretaceous sandstone Cloverly & Morrison Formations Cloverly & Morrison Formations Cloverly & Morrison Formations Cloverly & Morrison Formations KJ KJ & claystone

KJs – -Lower Cretaceous fine- Cloverly & Morrison & Sundance Cloverly & Morrison & Sundance Cloverly & Morrison & Sundance – KJs – – undifferentiated Mesozoic grained mixed clastics & medium- Formations Formations Formations geologic unit(s)1 grained mixed clastics undifferentiated Mesozoic KJg KJg Middle Jurassic-Lower Cretaceous fine- Cloverly & Morrison & Sundance Cloverly & Morrison & Sundance Cloverly & Morrison & Sundance Cloverly & Morrison & Sundance geologic unit(s)1 KJg KJg grained clastics & medium-grained & Gypsum Spring Formations & Gypsum Spring Formations & Gypsum Spring Formations & Gypsum Spring Formations mixed clastics KJk – Middle Jurassic-Lower Cretaceous fine- & Morrison & Ellis Group & Morrison & – – – KJk – grained mixed clastics & medium- Kootenai Formations Kootenai Formation – grained mixed clastics K^ – Middle Jurassic-Lower Cretaceous Cloverly, Morrison, & Sundance – Cloverly, Morrison, & Sundance – K! – – – undifferentiated Mesozoic geologic sandstone & shale Formations Formations unit(s) 1 Js – Upper -Middle Jurassic Sundance Formation – Sundance Formation – Js – – – Asn sandstone & shale Sundance-Nugget aquifer

Jurassic Jurassic units Jsg Jsg Middle Jurassic-Lower Cretaceous Sundance & Gypsum Spring Sundance & Gypsum Spring Sundance & Gypsum Spring Sundance & Gypsum Spring Jsg Jsg sandstone & shale Formations Formations Formations Formations undifferentiated Mesozoic J^ – Upper Triassic(?)-Middle Jurassic(?) Sundance, Gypsum Spring, & Sundance, Gypsum Spring, & Sundance, Gypsum Spring, & – geologic unit(s)1 J! – – undifferentiated Mesozoic sandstone & shale Nugget Formation Nugget Formation Nugget Formation geologic unit(s)1 J^gn – Triassic(?)-Upper Jurassic sandstone & Gypsum Spring Formation & – Gypsum Spring Formation & – J!gn – – – fine-grained mixed clastics Nugget Sandstone Nugget Sandstone

J^gc – Lower Triassic-Upper Jurassic fine- Gypsum Spring Formation, Nugget Gypsum Spring Formation, – – J!gc – – – undifferentiated Mesozoic geologic grained mixed clastic and carbonate Sandstone, & Chugwater Nugget Sandstone, & Chugwater unit(s) 1 rocks Formation Formation J^n – Triassic(?)-Jurassic sandstone Nugget sandstone – Nugget sandstone – J!n – – – Asn Sundance-Nugget aquifer

^c ^c Lower-Upper Triassic siltstone & shale Chugwater Formation Chugwater Formation Chugwater Formation Chugwater Formation !c !c Ccd Chugwater-Dinwoody confining Ccd Chugwater-Dinwoody aquifer ^cd – Lower-Upper Triassic mudstone & Chugwater & Dinwoody Chugwater & Dinwoody Chugwater & Dinwoody – unit & confining unit !cd – – Formations Formations Formations

^Pcg – & Lower Triassic sandstone Chugwater & Goose Egg Chugwater & Goose Egg – – !Pcg – – – undifferentiated Mesozoic & & siltstone Formations Formations 1 Triassic units Paleozoic geologic unit(s) ^Pg ^Pg Permian & Lower Triassic sandstone Goose Egg Formation Goose Egg Formation Goose Egg Formation Goose Egg Formation !Pg !Pg ACp Phosphoria-Goose Egg aquifer ACp Phosphoria-Goose Egg aquifer & siltstone & confining unit & confining unit PALEOZOIC UNITS MzPz MzPz Upper -Lower Cretaceous Mesozoic & Paleozoic rocks Mesozoic & Paleozoic rocks Mesozoic & Paleozoic rocks Mesozoic & Paleozoic rocks MzPz MzPz undifferentiated Mesozoic & undifferentiated Mesozoic & sedimentary units & clastics (undivided) (undivided) (undivided) (undivided) Paleozoic geologic units 1 Paleozoic geologic units 1

Pp Pp Permian shale & phosphorite rocks Phosphoria Formation & related Phosphoria Formation & related Phosphoria Formation & related Phosphoria Formation & related Pp Pp ACp Phosphoria-Goose Egg aquifer ACp Phosphoria-Goose Egg aquifer rocks rocks rocks rocks & confining unit & confining unit P*Ma – Upper Mississippian-Permian Phosphoria Formation & related Phosphoria Formation & related – – undifferentiated Paleozoic geologic P$Ma – limestone & sandstone rocks, Quadrant Sandstone, & rocks, Quadrant Sandstone, & – – unit(s) 1 Amsden Formation Amsden Formation PM PM Upper Mississippian-Permian Tensleep Sandstone & Amsden Tensleep Sandstone & Amsden Tensleep Sandstone & Amsden Tensleep Sandstone & Amsden PM PM ACta Tensleep aquifer & Amsden Ata Tensleep aquifer & Amsden aquifer sandstone & carbonate Formation Formation Formation Formation confining unit Pzr – -Permian limestone, & Paleozoic rocks (undivided) – Paleozoic rocks (undivided) – Pzr – – – undifferentiated Paleozoic geologic dolostone unit(s) 1 Mm Mm Lower-Upper Mississippian limestone Madison Limestone or Group Madison Limestone or Group Madison Limestone or Group Mm Mm Am & dolostone(dolomite) Madison aquifer

MD MD Upper -Upper Mississippian Madison Group, Darby or Three Madison Group, Three Forks, & Madison Limestone & Darby Madison Group MD MD undifferentiated Paleozoic geologic limestone & dolomite Forks, & Jefferson Formations Jefferson Formations Formation unit(s) 1 MO – Middle Upper Madison Limestone and Bighorn Madison Limestone and Bighorn – – MO – Mississippian limestone and dolostone Dolomite Dolomite – – (dolomite) MDO – Lower Mississippian-Ordovician Madison Limestone, Darby or Madison Limestone, Darby or – – Amb Madison-Bighorn aquifer MDO – limestone or dolomite Three Forks, Jefferson, & Three Forks, Jefferson, & – – Beartooth Butte Formations & Beartooth Butte Formations & Bighorn Dolomite Bighorn Dolomite DO DO Upper Devonian-Middle Ordovician Three Forks, Jefferson, & Three Forks, Jefferson, & – Three Forks, Jefferson, & DO DO carbonate rock & mudstone Beartooth Formations & Bighorn Beartooth Formations & Bighorn – Beartooth Formations & Bighorn Dolomite Dolomite Dolomite Ob Ob Upper & middle Ordovician Bighorn Dolomite Bighorn Dolomite – Bighorn Dolomite Ob Ob – dolostone(dolomite)

O_O_ Middle Cambrian-Upper Ordovician Bighorn Dolomite, Gallatin Bighorn Dolomite, Gallatin Bighorn Dolomite, Gallatin Bighorn Dolomite, Gallatin O^ O^ undifferentiated Paleozoic undifferentiated Paleozoic limestone & dolostone(dolomite) Limestone, Gros Ventre Formation Limestone, Gros Ventre Formation Limestone, Gros Ventre Formation Limestone, Gros Ventre Formation geologic unit(s) 1 geologic unit(s) 1 & Flathead Sandstone & Flathead Sandstone & Flathead Sandstone & Flathead Sandstone _r _r Middle-Upper Cambrian limestone & Gallatin Limestone, Gros Ventre Gallatin Limestone, Gros Ventre Gallatin Limestone, Gros Ventre Gallatin Limestone, Gros Ventre ^r ^r sandstone Formation & Equivalents & Formation & Equivalents & Formation & Equivalents & Formation & Equivalents & Afl Gallatin-Gros Ventre confining unit Afl Gallatin-Gros Ventre confining unit & Flathead aquifer & Flathead aquifer Flathead Sandstone Flathead Sandstone Flathead Sandstone Flathead Sandstone UNITS =r =r Early-Late Archean granitic gneiss, Precambrian rocks Precambrian rocks Precambrian rocks Precambrian rocks metasedimentary & metavolcanic p^r p^r C= C= rocks, granodiorite, granitoid, and Precambrian basal confining unit(s) Precambrian basal confining unit(s) quartz monzonite

* Montana lithostratigraphic units as named for their Wyoming equivalents References: Plates II & III of this report 1 Lithostratigraphic unit is undifferentiated on the Wyoming state map. 2 Function of lithostratigraphic unit as hydrogeologic unit is not defined.

Geologic units and corresponding lithostratigraphic units and hydrogeologic units, Wind/Bighorn River Basin, Wyoming and Montana. compiled by Nikolaus Gribb, Brett N. Worman, and Tomas Gracias

2012