WYOMING STATE GEOLOGICAL SURVEY Plate I Thomas A. Drean, State Geologist Wind/Bighorn Basin Plan II - Available Groundwater Determination Technical Memorandum Surface Geology - Wind/Bighorn River Basin SWEET GRASS

R25E R5E R15E R30E R10E R20E MONTANA Mm PM Jsg T7S KJ !c Pp Jsg KJ water Qt Surface Geology Ti ! Red Lodge PM DO PM PM Ts Ts p^r PM N ^r DO KJ DO !c Wind/Bighorn River Basin Tts Mm water Mm Ti Ti ^r DO Kmt Ti LOCATION MAP p^r ^r ^r Qt WYOMING Wyoming and Montana Kf Qt Ti p^r !c p^r PM 0 100 250 Miles Tts ^r PM DO Ti Jsg MD Ts Ti MzPz Kmv !Pg Qt compiled DO DO Tts Ts Taw DO DO DO water Qt Kc PM ^r

Twl Qt Ob O^ by

^r Mm DO !c MD MONTANA Thr Ti Kc Qr Klc p^r Kmv Kc

: # Ts ^r : O^ Nikolaus Gribb, Brett Worman, #

Ts # water : PM Taw # Kf : PM

!cd : Ket Qb Taw Qu Twp

Thr # Ki Twl 345

P$Ma : Thr

O^ Qa KJg Tfu : Jsg ^r Qu : :: # Kl !( KJk : Qr Qls Tomas Gracias, and Scott Quillinan

Qb : Thr Ts Taw # Tfu 37 PM Kft: : # ::

T10S Qls # Thr : # ^r Kc !( Kft Kmt # :::::: p^r :: :

Qu KJk Kc MD Taw DO Qu # p^r Qg :: Km KJ WYOMING Taw Ti : Kl 2012

Thr : Qb # # # Qg : water DO Qls ::: !c !Pg

!cd MDO water water Kc Qa ::::::

:: Kmt ::: : Twl 90

: Ti Ts Qu Qa Qg Kmv !Pcg Mm KJk : Qg

: 212

: Qu Qg £¤ Kmv KJ §¨¦

Tts Taw p^r ^r # Kl : Kf Kf 338 Ob !cd Qu Qu Ttp # !( : : : p^r ::: !Pg O^ MD P$Ma Thr : Qa # DO Km Qls 343

^r Qls Taw : Qb Qg Qls Qa Km Jsg water !( : Qb # !cd ^r

Kc Lake Bighorn

: MD # Taw Qa Qls Qt MD A′ MD MD Qg Twl !Pg Qu Qb Tii # Twp ^r water MzPz Qg Tfu Kl :::

Taw Taw Twp Qls : Qt Kmv Qa Ob

P$Ma :

Thr Qa # Tcr ^r water Qa Kft # Qt O^ Qb 294 :

Thr p^r Ttl # # 296 !(

Qu O^ Qb Qa # Qa

Tii # : MD

MD # MDO !( Qt Qa !c O^ : ::: # Kc : Qr : Kc 0 5 10 20 30 Miles

p^r Qu Tts # # ^r Km 310 Kf

Qg : Ts : Qg Qg Twl £ Qa #

Qr : ¤

: :

: Qr Qr N

: Ttl Qa # Qa #

Thr ^r : DO Tfu :: Kmv PM MD

Taw Qr Ts Qg Ti # KJ Taw :

# Qg :

p^r : Qa : 14

P$Ma Thr Qu Taw Qb # # # ! £¤

O^ : : Lovell Scale 1:380,000 :

Ti : : # Kc : Kc O^# # : : Twl

: Tcr : 294 ::

^r # : Kl ::: Kf Qls p^r

Mm Twp :

: : # !( : Qt Kf # # : Qg

: Taw # MDO Kmv ::: Kc Qt Kmt Sheridan ! 1 inch equals approximately 6 miles

water MD : : Tts Kmt : Ttl : # ^r DO # Qa

# # # # Qt #

: : #

Taw Ti Qg : : ^r

: : : : Taw : Qt Kmt

: Qg # Twp Qg : ALT

Qu Ttl # Twl # :: Kmv : Kmt 14 Qls #

Ts : Ttp £

: ¤ : : : : Qr

: 89 Qb : # :

: : #

Qb £¤ Qr : : # MDO ^r : :: Kmv : Km Taw :

Qr # # # # :

: Ttp # # Mm ::: !Pg KJg : MzPz : : :

water Qg Qg Powell : : p^r :

# Qls : Kc Kmt KJ :

: # # Qls ! : O^ Kft Tfu : PM T55N : #

: Ttl # PM Tfu Kf MD

Qu # # # # # MD

Qr : Qa Ttp : : # Kl : :

: : Qb Taw # : Qt Qa Kmt

: Ttl Twp # Jsg 295 !c

: Taw

Qu Qb Twp Thr # ALT !( Kf !c

MONTANA Qu Qr : MDO Jsg Twp # : Qa Qa

Ttl 14 Qt Ob : Qls

# Taw # :

: # # £¤ Explanation

Thr # Jsg

: # # # :::

Thr : # Kmt # KJ

Qr : KJ : # : : : Qls : Kl Qa

MDO !cd # :

Tcr # !Pg

: # #

Tcr Kf :

# : Tfu

# Ob KJ Kmt 335 : :

Qu DO MzPz : Kc

: water Qu DO Jsg !(

Qu Qa # # MDO Kmt KJ KJ MD : :

water Ttp Qg : Qls ^r PM Qt ::: 90 Interstate highway 14 US highway 343 State highway Wind River/Bighorn River Basin hydrologic divide 20 : Qt Kmv !c Kmt ¤£ ( : : Qa Mm Ob KJ PM

£¤ :: Kl !c ¨¦§

Ttl Ttl Qb Qa Mm !cd # Kf Qa

: # O^

Qu Ti : Taw Kmt ^r : :

: !cd Jsg Qa Km MD !

Twp Taw Qa Ob Line of section (Plate VI.) City or town #

Qu Ttp : Qls !Pcg:: Qls Kl ::: : Ob A A′

!c # Tfu Kmv Kc MD : !c

Qu : MzPz Taw Jsg # Kmt Qls :

Qr Qg Kf Km # Qt Kf Normal fault - location certain State boundary

: Ttp :

: Qa : PM Taw

: Qls 120 Kmv Qls barbell on downthrown side : Qu water !( ## :

: Ttl : Qr : Qa : Twp Kmt !cd Jsg Twl Qt Qa Mm KJ O^ Normal fault - location concealed }

Qg MzPz 32 789 # Kc County boundary

: : : Kf Jsg

: Twp KJ ^r # Mm !( !( #

: Qu Ttl KJ p^r Jsg ## : 310 Thrust fault - location certain Ttp: Qt Qg Mm £¤ 14 Qls Qr Qu : water : Ttp KJg# !cd Kmt # Qt PM Kmt £¤ PM sawteeth on upper plate Township and Range boundaries water : Kmt Qg #

Qt MD Thrust fault - location concealed }

: DO !Pcg

: : Qls Twl O^ Qr : # Kc Kmt Qa Qt #

: B′ Qt Qt # Jsg PM Wind River Indian Reservation boundary

: KJ

Ttp # Twp Mm Qt # Gravity slide masses related to Heart Mountain, South Fork, Qa Qa # #

Ttp : # : : ! Kmt : : Ttl Kf : : Ttl Qg : # Cody Kf Qg and eastern/southeastern Absaroka detachments

: : : Kl Qt KJ

MDO ^r Kmt KJ PM Yellowstone National Park boundary : Qls # 20 Kf Qr Qls # Kc Kmt 14 16

water : : Twl # MzPz Kmv Tfu# £¤ £¤ £¤ : Jsg QTg Qr : Kl Jsg

: : : Kc Buffalo Bill Res. Kf

: ! p^r

KJs : :

Qu : MD : !cd Qt Kc Qu Qa# Tfu Qt ##

: Qu # : Greybull

Yellowstone Ti Kc # : # Jsg KJ !Pcg

Twp Qa # KJ

Ttp £20 # Km QTg Qg

Lake ¤ : 16 # water Kf !cd # Kl 14 £¤ MDO :

: Qls # Kft # Kmt Kf Ttp £¤ : #

Qg Kf H′ !Pg

Qr Ttp Qa Qa KJ Kf Qt Twl Qa : Ttl Kc Qa Kl #Kmv Qu : Qa : Qr Ttl : Qt H : !Pcg Kmv # Kc MD

Ttp : Qa Qt Kft PM water : Qa

water Kc Kmv 30 Surface Geology

Ti Kf !( # Qls Qg # : Kc Twr : Ttp Twl # Kc Kf Qu Qg Qls Twp Qa Qt : O^ (Units in boldface are described in Chapter 7.)

: # # KJg Qg

water Ti 120 # Qt ! Qa Twp : # Qa !( Kc

: KJ Kmt Basin # Qa

Ttp # Kl #

Kc : : Ti

Qr #

Jsg Ttl Qg Kc # Kft Kf :

Ttl Kf :: Km Twr Wyoming Geologic Units Montana Geologic Units, as named

Twi Ti # ::

: Twl # # : Qa p^r : water Twi Kft #

Qg :: Qt :: :: # : Ttl ## # Qls

Ttl # Kmv for their Wyoming equivalents Qg # # : : : :: # #

Ttp : # Km : Jsg CENOZOIC Qg Qg # Kf Qt Tfu Km PM T50N # # Kmv # ::

Kc Kf Twl Kf KJ Cretaceous continued # CENOZOIC water Twi Twi Ti # Kl Qt Kl Quaternary

: Qg KJ # KJ Kf Km Tta Qt

Kb Qu Twi Ttp Twl Qls Qls I′ Qa KJ Quaternary : Kft Kmt Qls J′ Alluvium & colluvium Cloverly & Morrison Formations : MD Qg KJ Km Ttl Twp Qa # Qa

: Ttl Qls 31 O^ KJs Alluvium & colluvium

# !( Qu : KJg Undivided surficial deposits Cloverly, Morrison, & Sundance Formations Kha # Qt Kmt Qg Ttl Tfu 16 Twp # Ttp Qa Qt KJ £¤ Qu : KJ Undivided surficial deposits

Ttp Twl Ql KJg Cloverly, Morrison, Sundance, & Gypsum Spring Formations

Twi Qt Kc Kc Playa lake and other lacustrine deposits

: Twi : : : # Ttl : Twr Qls Kc Kmt : Qg Glacial deposits

# Qt Kft Kl Qt KJ Kf Qg KJk Ellis Group Qt Twi Ts Km # Qls Landslide deposits

Twi Qt 20 PM water Qls Qt £¤ KJ : Qt Gravel, pediment, and fan deposits Qa # K! Cloverly, Morrison, Sundance, & Gypsum Spring Formations & : Qg Twp Qls 789 Qs Dune sand and loess deposits £¤89 Ttl Ti !( Tml Nugget Sandstone

Qg #

: Kf : Twi Meeteetse

Qt Twl Kft Kmv Qg # ! KJ Glacial deposits Qb Qu # Kc # Kc Qa p^r Twi Twi Km Jurassic Ttl Kf Upper Tertiary Twl Qls Qt Qg Ts Qt !Pcg Qu Gravel, pediment, and fan deposits Js Sundance Formation water Kmv 16 Tml Thr Ttl Qa 290 Tt Kmv £¤ Qls Huckleberry Ridge Tuff of Yellowstone Group

Ttl Kft !( Kl MD

Qt Jsg QTg Terrace gravel deposits Jsg Sundance & Gypsum Spring Formations : PM Twi Ti Twl Qa Qt Jsg

Twi Qg Twi Twl Kc Kl # Tta Kmt KJ Ti Intrusive igneous rocks Twl Twl# Qt Km

Qt Tfu Qb Basalt flows, tuff, and intrusive igneous rocks J! Qls Qa KJ Sundance & Gypsum Spring Formations & Nugget Sandstone

Ttl Ti Twl I Qa MD Tts Thorofare Creek Group

Ttl : Qg Kmv Kl Kc :

: Qls Qt J Kf KJ Qr Qg : Qa : !Pg O^ Rhyolite flows, tuff, and intrusive igneous rocks J!gn Gypsum Spring Formation & Nugget Sandstone

Twi : Kf Qa # Qt 433 : Twp Qa Ttl Ti : Qa Wapiti Formation Twi Qa # Kc !( ! : Qa # Km Qg Qls Kmt Kc Yellowstone J!n Nugget Sandstone Kf Twl Ten Sleep Ts

: Twl Qt ! Upper Tertiary Group Crescent Hill Basalt

: : Ta

: # Qls Kc Kmv 431 Twl KJ J!gc Gypsum Spring & Chugwater Formations & Nugget Sandstone Qa Ta Twl Kf Qa Klm !(

Ti : Worland

Qg Ti: Qa Qls Kc Twr Thr Huckleberry Ridge Tuff of Yellowstone Group Taw Washburn Group Ti : :

: PM : Twl Ti Qg :

Twl Kc : : Tii Intrusive and extrusive igneous rocks Twl Ta : Willwood Formation Qls : # Qa Kmt Triassic Twi # Qt Qt Qg Qg Ti # Klm

Ti Qg Twl !Pcg Tcv

Qa Kft Qt Caldwell Canyon Volcanics !c Chugwater Formation Tfu Fort Union Formation

Ta : Tfu Qg 432 434 Mm Ti : # Kc !(

Twl !( : Tmu Ti # Kc : Tfu Klm Jsg Upper Miocene rocks !cd Chugwater & Dinwoody Formations

Qls Tt Tfu

Qa Ta Twl Ti Ta : Qls 171 :

# !( Kmt Qa PM Tm Miocene rocks MESOZOIC : # Kmv !Pcg Chugwater & Goose Egg Formations Ti # Klm Twl Tfu Klm O^ Qa : Ti # Tt : Tfu Kmt : : Twl Twl 20 Tml Lower Miocene rocks; includes Split Rock Formation Cretaceous IDAHO PM : : : £¤ !Pg Goose Egg Formation Qls Klm Twl MD O^ Tt Twl T45N Kl Tcv # Qa Qa Lance Formation Ti Kc Tt Kmv KJ

Qt Tfu Kmv MzPz Mesozoic & Paleozoic rocks WYOMING Ti Tt Kc

Klm Tfu PM Lower Tertiary Km Meeteetse Formation

O^ # # Twl : Tt:

Ti Tt Tt Kc Mm

Tcv p^r Twr Kmv : White River Formation Mesaverde Formation

: Qa Ti Tt Qt

: Twi PM Ti Tt : Kmv Kl !Pcg PALEOZOIC

Qls : : Qt

: MD Ti # Tt Kc Ti Klm :

Pp Twi Tt Intrusive igneous rocks Kc Cody Shale

Twi Qa Tt Ta Tt Kc Pzr

: Twi # Kft # Km Paleozoic rocks

Tt : # !cd : Mm

# # Tt Kmv

: Ta O^ #

# Tt 120 Kmv Klm Tts Thorofare Creek & Sunlight Groups Kf

Tt # ! Frontier Formation PM PM : (

Ta : Kmv Kft 789

MD Qls#

Qg water PM : Ti # Qt !( # #

Qa Qa Tt : : Ta Kmv Qt !Pg Twi

Ta Ta MD MD Tt Wiggins Formation Kft Frontier Formation, Mowry & Thermopolis Shales # Tt

# Pp

Qls # Kc Qa PM Permian p^r : : Qa MD KJg # Qa 26 : Kf Qt Pp

£¤ £¤26 Tim Qg Qa Qls Kmt Jsg Ttl Two Ocean & Langford Formations Pp Phosphoria Formation/Park City Formation Kmt

PM Tt Twl Qt KJg !Pg Mowry Shale, Muddy Sandstone, & Thermopolis Shale Qls # Qa # Qt A # Qls Qls Qa Qls Qa Qt Kc 89 Ta Tt O^ Ta # 170

£¤ Twdr KJg Kc !( KJg Kmt Kf Tt Tepee Trail Formation P$Ma KJ

# !cd Qls Twdr MD Tt Kf Phosphoria & Amsden Formations & Quadrant Sandstone Cloverly & Morrison Formations # Qt Kc Ta Kf # Kf

Ta Ta Qa Ta Kmt Kmt Qls Absaroka

191 Qg Qa Twdr Qa Twi # Qt Pp Pp Qt !cd !Pg # Kmt

£¤ Twdr Tt PM C′ Pp KJg KJ !Pcg Ta Aycross Formation Qg Qa Ta p^r Kf Kf !cd ^r Volcanic KJg Cloverly, Morrison, Sundance, & Gypsum Spring Formations Twdr Kf MD : PM Qg Pp Qg Ta PM !cd Supergroup !cd Pp Kmt Thermopolis Kf Kmt Mm #Ta # Qg Qa Qg Pp # Ttp Pennsylvanian Qb Qls !cd Twdr O^ O^ # # !cd p^r Trout Peak Trachyandesite Kc # # PM !cd ! Kf Twdr Ta # !cd Kmt Qa Kf KJs Tt MD KJg PM Tensleep Sandstone & Amsden Formation 287 Qls Kf Kf # MD # O^ Kmt Twp # Qg Qg £¤ Qa O^ PM p^r Pp KJg Qls Wapiti Formation Jurassic Qls Qg Qg Qa Ta Tim MD KJg !c Jsg # p^r PM p^r # Sundance & Gypsum Spring Formations, Nugget Sandstone Qa Kc #PM Pp MD # KJg Kf PM KJs Twdr # PM# Pp Qls Kmt Ts Crescent Hill Basalt

Ta Twdr Tt Qa Pp Pp O^ !cd !cd J!gc Twdr # KJ Ta Qt # # Ta Twim !cd Kmt Kf KJg Mississippian

# # MD K! Qls !c PM Pp O^ Taw Washburn Group

Twim Tim p^r Qa T7N # PM Mm Mm 390 Pp K! # Pp Madison Limestone

!( Qls # O^ # # Qt J!gn PM Qg Qls # Pp # Qls 20 Kmt Triassic J!gn # PM :

Qa Qa O^ J! J! Kmt £¤ !cd QTg : Qt Pp # Qt Twdr Qa Qa K! # !cd Kmt Jsg !Pg Mm Twb Wagon Bed Formation # Kmt : PM !c Twdr Kf : KJ MD Chugwater Formation O^ Ta O^ KJ Qa Qa Mm Madison Group; Three Forks, & Jefferson Formations J!gn # # Qa PM MD KJ !cd PM # MD Kmt Kf # Pp Qa MD !cd # Twb

! # MD PM Pp Kf Pp # D′ Mm Pp ^r Tv Volcanic conglomerate Qls # p^r Kc Tim # # Twb Mm MO Madison Limestone & Bighorn Dolomite !Pg Goose Egg Formation : # # Qt !cd # Qt :: DuboisKJs Ta # !cd !cd O^ 789 PM Jsg Jsg Twb

22 Kc Kmt !( Mm G′

!( Qg Twim Kmt #J! KJ K! K! !cd !cd F′ Twdr Wind River Formation

Qg # Kle Kl # Madison Limestone, Darby, Three Forks, Jefferson

Qls Pp Kc # # Kc Qls # Pp Twb : MDO MzPz Mesozoic & Paleozoic rocks Jackson Qg !cd Twdr Kf Kc KJ # Kc O^ PM & Beartooth Butte Formations, Bighorn Dolomite

: E′

! O^ Qg # Qa Kf Kc PM Mm ^r Twdr Twdr Qt # Twdr !cd Kmv Pp Twim

PM KJs Tim Qt O^ O^ : Wind River & Indian Meadows Formations Pp water Tfu Pp : : # Kf # # Kmv Pp PM Mm ^r

Twim J! MD Pp : !cd

KJ Kmt # # # # Twb Pp Mm

B MD # Kmv Kl !cd Twdr MD Mm Tta p^r Qg Pp Tim # Tim Tfu Pp Tml Tatman Formation

Qa Kf # # Kle : # ^r J!gn # Qa K! PM Mm ^r ^r Mm Devonian PALEOZOIC : Pp PM Twdr KJs Kc # Tfu Kle # Kmt O^ PM O^ p^r Mm T40N Twl

Qa # Tim T5N Mm ^r Willwood Formation Kmt # Twr Qa Ql J!gn KJg # Tfu Twdr Kle Kc # Twb PM DO Three Forks, Jefferson & Beartooth Butte Formations, Bighorn Dolomite Permian Qls Qt Kc Kmv KJ Kle Qa Pzr Mm !cd Mm : Qg Pp Twdr # Kf Tim Qa Kmv PM !cd Qt PM Twb Tim Indian Meadows Formation Twdr # Tim Qa p^r : !cd Qt Kc Qa # MzPz Twb PM Pp Phosphoria Formation

O^ Pp # P$M Jsg ^r

O^ PM Qa J! Qg Twdr Twb Qa #

# Kmt Qa # # Tcr

# Crandall Conglomerate water Qa Tfu Qa Tim Qt KJ # : ^r Ordovician

191 Twdr Twdr Twdr ^r

£¤ water Qa Twdr Qa : # # :

!cd Twdr Kmv Qa Qa Tfu Ob Pennsylvanian Pp : Fort Union Formation Bighorn Dolomite MD J!gn Qa Boysen Qt Qt Qa Qa Mm Qa # Jsg : Tim #

Qt Qt Res. : Twr PM PM

Qg water Twdr Qa Qt Qa Qt Qa Tfu TKu Sedimentary rocks (undivided) O^ Bighorn Dolomite, Snowy Range Formation, Pilgrim Limestone, Tensleep & Amsden Formations

Qt Qa Twdr ^r Mm

ice !cd Twb Park & Wolsey Shales, Meagher Limestone, Wolsey Shale

p^r Qls Qa !cd # Twdr Qt Qt Tml Twdr water : :

Qa Qg Kf 26 : Qt & Flathead Sandstone

£¤ : Mm Pp KJs Qt : Pp

Kmt : 287 R3W water : R5E : : PM J!gn £¤ Qa R3E Qt Qa water Twb !c Qt Mississippian Twdr Twdr Twdr R1W R1E Qt Qa Qa Qa : !cd O^ : : Js MESOZOIC Kf Cambrian Mm Madison Limestone Qa # Qg R5W KJs # Qt Cambrian rocks; includes Gallatin Limestone, MD PM Twdr Kmv Qa Qt Kmt Jsg ^r 26 ice Qa Qg Kmt Qt : Gros Ventre Formation,& Flathead Sandstone MD £¤ Ql Qt # KJ Cretaceous Madison Group, Three Forks, & Jefferson Formations Qt KJs Twdr Kc Twdr Qs Kf Qg J!gn Twdr Qt # Kc Ki Intrusive igneous rocks ice Twdr Kmv Shoshoni Twdr # Pp Qg ! Twb p^r KJs Qa T3N Qa Qs £¤189 !cd Qg Qs Kc Kl Lance Formation PRECAMBRIAN Devonian O^ J!gn Twdr Kc # Kmt Kf Qt # Three Forks, Jefferson, & Beartooth Butte Formations J!gn Qt Qs Tim p^r DO KJs Bull Lake Kc water Qt Qs Klm Lance, Fox Hills & Meeteetse Formations & Bearpaw & Lewis Shales Precambrian rocks & Bighorn Dolomite Twdr Qg Kc Qa water !(133 Twdr Qg Twdr Ocean 134 Twdr

MD water Qt !( Qs 26 Kc Klc 191 ice # Lake £ £¤ Qa Qt ¤ # Landslide Creek Formation Tfu Ordovician # Pp Qg Twdr Tfu # # !cd Twdr Kha Harebell Formation Ob Qls Qt 20 Bighorn Dolomite ice Qa 789 £¤ Qs Kft !( # Km Qg # KJs Kf Qs Meeteetse Formation O^ Qa Qt 26 Ordovician & Cambrian (undivided) Kc £¤ Qt Kmt 26 Qa Qs # 287 Kc £¤ Kml Meeteetse Formation & Lewis Shale 352 PRECAMBRIAN # £¤ !( Twdr 20 # !cd Qa Kmt £¤ Qs Twdr Cambrian BASEMENT Qg Kf Qt Kle Lewis Shale p^r Kf 132 Qs Qs MONTANA # J!gn Kc KJs !( ^r # # # STRUCTURE # C Qt Qa Qt Cambrian rocks (undivided) # # # Qt Kmv Twdr Mesaverde Formation # WYOMING Qg Kf # # J!gn T1N # # Qa # # Kmt # !cd Kc # Qg Kc # Cody Shale # # # KJs ! Twdr # # Qg KJs PRECAMBRIAN # Pre-erosion elevation above or PM Kf Riverton # SHERIDAN # !cd # Kf Qs T35N Ket Everts & Telegraph Creek Formations & Eagle Sandstone # Qg Pp # Twdr Qt Qs Qa 239 # T55N below mean sea level (feet) # MD J!gn Qt p^r Precambrian rocks !( # Kf # # !cd Qa Tfu Tfu water Qg # Kmt Kb Bacon Ridge Sandstone # Kc Kf Qt # Qa Klm

# 20,000 # # Twdr !(136 Tfu

# # J!gn # Qt Kf Frontier Formation

# # : Kl Klm Kc : 16,000 Kf 138 789 Qa Twdr

# Kc Twdr !( !( Kmv PARK # # Kc Kl Tfu !cd Kl : Kft Kmt Kmv # Frontier Formation, Mowry Shale, Muddy Sandstone, & Thermopolis Shale LINCOLN # 12,000 # Tfu # # # # KJ Kmt Kl Kc Kml # 8,000 Qa Twdr Tfu Tfu Kmt Mowry Shale, Muddy Sandstone, & Thermopolis Shale # O^ Js Kc KJs Tfu Kml

# Kmv # Pp J!gn Qt Kl Qa # BIG HORN 354 T50N 4,000 PM Kml Kmv # !( # J!gn # Tfu Kc # MD Tfu Kc PM # # Kf Kmv Kmv Kf Kc # 0 Pinedale Qg Kl !Pg

# Qt

# # # Kc Kc Kmv Qa Kc Qls Qt Mm IDAHO Qg !cd

-4,000 water Kmt Kf # ^r

# # Kf # J!gn Twdr Kmt # !Pg : p^r # p^r Js -8,000 : 135 Twdr : # Kf Kc # J!n Lander Kmv !( KJ PM # KJ ! Qa !c : Twdr Qt Kf # # -12,000 # Kc Kf !Pg !cd Kf Qa 237 # water Kc Kmt !( # # WASHAKIE -16,000 Pp Tfu KJ Twb Mm # Kmt ^r # J! # T45N Qa Kc Kmv # Kmt # -20,000 Qg KJ J!gn # Twr # # Twdr Tm TETON # # #

# # water Qls Qls Kf !cd Twdr

# # -24,000 Kmt 238 # # # KJs Kc

!( # PM KJ

# # Qa

# # O^ 131

# # Kf

# # # # 189 MD !( PM KJ

# -28,000 Kmt # # # # £¤ Twdr !cd Kmt # # # # : Tfu Pzr # # # Qg KJ Kmt # # # Twb Pp Twb # # # Kf

# # # HOT# SPRINGS 353 !cd Twdr Twr Tm Qt # # # No data !( Kmt Qa Kf Disclaimer References

# # # Qg 236 # # J!gn Tm Users of this map are cautioned against using the data at scales different from those compiled for this map. Using this data at a larger Blackstone, D.L., Jr., 1993, Precambrian basement map of Wyoming: Wyoming State !( # p^r !cd Kc Twr : # # Tm # scale will not provide greater accuracy and is, in fact, misuse of the data. The Wyoming State Geological Survey (WSGS ) and the # # T40N Twdr Qa Geological Survey Map Series 43, scale 1:1,000,000. # # ## # Pp Qls !cd Tfu State of Wyoming make no representation or warranty, expressed or implied, regarding the use, accuracy, or completeness, of the data # Keefer, W.R., 1970, Structural geology of the Wind River Basin, Wyoming: U.S. # # # # # Faults J!gn Kmt # Mm presented herein or from a map printed from these data. The WSGS does not guarantee the digital data or any map printed from the # Geological Survey Professional Paper 495-D, 35 p. !(241 # J!n £¤287 # Kf Kf data to be free from error or inaccuracy. The WSGS and the State of Wyoming disclaim any responsibility for interpretations made Love, J.D., and Christiansen, A.C., compilers, 1985, Geologic map of Wyoming: U.S.

# (Dashed where inferred) p^r J!n KJ # # # Mm !cd Qa Kc from these digital data or from any map printed from these digital data, or for any decisions based on these d igital data or printed Geological Survey map, scale 1:500,000, 3 sheets. # maps. The WSGS and the State of Wyoming retain and do not waive sovereign immunity. The use of or reference to trademarks, Sharkey, H.H.R., Love, J.D., and Kirby, Jewell, 1944, Map of Wyoming showing test O^ !cd Kmt Twr G # FREMONT Qls Qls KJg Kmt Kf trade names, or other product or company names in this publication is for descriptive or informational purpos es, or is pursuant to wells for oil and gas, anticlinal axes, and oil and gas fields: U.S. Geological N Qa D Qa KJg licensing agreements between the WSGS or State of Wyoming and software or hardware developers/vendors, and does not imply Survey Oil and Gas Investigations Series, Preliminary map 19. # PM PM J!n !cd endorsement of those products by the WSGS or the State of Wyoming. Stoeser D.B., Green, G.N., et al., 2005, Preliminary integrated geologic map database for Qg 28 !cd !cd Tm !( Twr Kmt Qls the United States central states…: U.S. Geological Survey Open-File Report T35N 351 Mm Pp T30N # Mm # # # !( Qa Twr # !cd KJ J!n 2005-1351, version 1.2, updated December 2007, digital data. [Includes LINCOLN # p^r # J!gn !cd Mm Wyoming and Montana at scale 1:500,000.] # PM : # Twr # NATRONA Qa # Qa J!n J!n p^r Vuke, S.M., Porter, K.W., et al., compilers, 2007, Geologic map of Montana: Montana # # # PM Qa Mm O^ Tm SUBLETTE # Pp Jsg Bureau of Mines and Geology Map 62 (GM-62), edition 1.0 (2007); and manual, # # Twr

£¤350 E Pp PM # O^ Twr 67 p., digital data. # # Mm PM Mm J!gn !cd Kf Mm # 0 25 50 Miles p^r Base from ESRI Data and Maps (DVD), (2006): Redlands, Calif., Environmental Systems Research Institute. # # Js KJ Kmt 89 Qa O^ PM

£¤ !cd Twr #

# O^ Pp R90W # p^r Tmu 287

T30N Tmu £¤ 789 # # £¤ R85W R115W R105W R100W R95W R110W Modified from Blackstone (1993) ￿ R105W R100W R95W R90W R85W F

!(28 !(220