7 6 5 4 3 2 1 Lieu, 1966;Richter, 1981,tableIV-1, andreferencestherein). Composed ofupperLeighDolomiteMemberandLanderSandstone (Keeferand Van Silurian rocksnotpresentin Wind RiverBasin. Predominant lithologyofformationissandstone,anditunknownwhy formation isdefined Function ofMuddySandstoneashydrogeologicunitnotdefinedin Split RockFormationpreviouslydefinedas ArikareeFormationin Wind RiverBasin Function oflithostratigraphicunitashydrogeologicnotdefined. Pliocene rocksnotpresentin Wind RiverBasin. Plate II. (2007, fig.4-9). (Love etal.,1993). as “Majoraquifer–limestone”in WWC Engineeringet al. (2007,fig.4-9). PALEOZOIC MESOZOIC CENOZOIC ERA Jurassic(?) and Triassic(?)Jurassic(?) Precambrian Devo- Pennsylva- System andSeries Cambrian Ordovician Mississippian Triassic Jurassic Cretaceous Tertiary Quaternary

Silurian nian nian Permian Mississippian Mississippian Pleistocene Pennsylvanian Pennsylvanian Pennsylvanian Ordovician Ordovician Cretaceous Cretaceous Oligocene Paleocene Cambrian Cambrian Holocene Pliocene Miocene Jurassic Jurassic Triassic Triassic Devonian Eocene Middle Middle Middle Relation of lithostratigraphic to hydrogeologic units Wind River units, Basin, Lower Lower Upper Upper Upper Upper Upper 6 Lower Middle Upper Lower Upper Upper and 1

Pilgrim Limestone Conglomerate of Formation South Pass and relatedrocks(ParkCityFm) “Lakota Sandstone” middle Eocene Lithostratigraphic unitsofLoveetal.(1993) Chugwater Group “Fuson Shale” Darwin SsMbr “Dakota Sandstone” Roaring Fork Snowy Range Formation Wind River Mesaverde Split Rock Upper and or Fm Formation Formation Gypsum SpringFormation Cloverly Formation Range rocks Shale Cody Phosphoria Formation Dinwoody Formation dune sand(eolian)deposits,and Crow MountainSsorSandstoneMember Alcova Limestoneor Popo Agie FormationorMember Red PeakFormationorMember Alluvium, terracedeposits, 2 2 White RiverFormation Gros VentreFormation Wind RiverFormation Sundance Formation Morrison Formation Madison Limestone 2 Tensleep Sandstone Flathead Sandstone Amsden Formation Frontier Formation Bighorn Dolomite Thermopolis Shale 3 Precambrian rocks landslide deposits, Nugget Sandstone Muddy Sandstone Darby Formation

2 glacial deposits Mowry Shale 2

Meeteetse Fm

WWC Engineeringetal. Fort Union Eocene Indian MeadowsFm

Gallatin Limestone Mesaverde Formation Fm 2 Wind RiverBasin Lance Formation rocks Lower

Wallace Creek Tongue of Limestone Member Tepee TrailFm Shotgun Teapot Sandstone Fales SsMember Formation unnamed Mbr Parkman SsMbr Split Rock Aycross Fm Middle unnamed Mbr

Shale Cody Cody Shale Member 7 Lewis Shale member

Lewis Shale

Shale Mbr Forma- 3 Waltman Goose

Egg tion

Wagon Bed Fm Regional confiningunit/leaky (Teapot horizonaquifer) (Parkman-Fales aquifer) (Tensleep subaquifer) (Madison subaquifer) (Amsden subaquifer) (Bighorn subaquifer) Confined subaquifer Confined subaquifer Leaky confiningunit/regional Leaky confiningunit/regional Wyoming. (Darby subaquifer) Aquifer/leaky confiningunit (Fort Union–Lanceaquifer) (Sundance–Nugget aquifer) Aquifer (Arikareeaquifer) Hydrogeologic role/unitof Aquifer (Cloverlyaquifer) Aquifer (Flatheadaquifer) Aquifer (Frontieraquifer) Aquifer (Muddyaquifer) Confining unit Confining unit Confining unit Confining unit Regional confiningunit Regional confiningunit confining unit (Wind Riveraquifer) Mbr Ss Fm c.u. Abbreviations usedinthecolumns: Leaky confiningunit Leaky confiningunit Leaky confiningunit Leaky confiningunit (Phosphoria aquifer) Aquifer Aquifer Aquifer Aquifer Aquifer Aquifer Aquifer Regional aquifer Confining unit confining unit confining unit Not discussed Major aquifer Major aquifer Richter (1981) Aquifer Member Sandstone Formation Confining unit

3

Leaky Tensleep aquifer system Aquifer (Measaverde aquifer) confining unit Marginal aquifer Statewide FrameworkPlan(WWC Wagon BedFormation–marginal Hydrogeologic unitofWyoming Engineering etal.,2007,fig.4-9) ? Major aquifer–limestone Major aquifer–limestone Major aquifer–limestone/ Major aquifer–Sandstone Major aquifer–sandstone Major aquifer–sandstone Major aquifer–sandstone Major aquifer–limestone Major aquifer–limestone Major aquifer–alluvial Muddy Sandstone Marginal aquifer Marginal aquifer Marginal aquifer Marginal aquifer Major aquitard Major aquitard Major aquitard Major aquitard Major aquitard Major aquitard Minor aquifer Minor aquifer Minor aquifer Minor aquifer Minor aquifer Minor aquifer Minor aquifer Minor aquifer Minor aquifer minor aquifer aquifer and WWC Engineeringetal.(2007) Modified fromRichter(1981);Loveetal.(1993); 4 ? 5 5

Basal regionalconfiningunit deposits, andglacial-deposit Hydrogeologic unitusedinthisreport deposit aquifers,aquifersin Muddy Sandstone Phosphoria aquifer

and confiningunit Chugwater–Dinwoody Alluvial aquifers,terrace- Aycross–Wagon Bedconfiningunit fers indunesand(eolian) Sundance aquifer Teapot Sandstoneaquifer Gypsum Spring landslide deposits,aqui Morrison confiningunit confining unit Nugget aquifer Precambrian basalconfiningunit aquifer and confining unit Gallatin confiningunit Meeteetse–Lewis confiningunit confining unit Middle confiningunit Indian Meadowsconfiningunit confining unit Parkman Ssaquifer Thermopolis Fort Unionaquifer aquifer Tensleep aquifer Cloverly aquifer Madison aquifer Amsden aquifer Fales Ssaquifer Bighorn aquifer Frontier aquifer

Chugwater aquifer Mowry Confining unit Dinwoody c.u. confining unit Darby aquifer Lance aquifer Gros Ventre Popo Agie confiningunit White Riveraquifer Wind Riveraquifer Crow Mountainaquifer Split Rockaquifer aquifers Alcova confiningunit Flathead aquifer Red Peakaquifer confining unit

Cody

Goose Egg aquifer and

confining unit Sundance–Nugget Mowry–Thermopolis - aquifer confining unit Goose Egg– Phosphoria Quaternary Gallatin–Gros Ventre aquifer and Fort Union–Lance Paleozoic aquifer system Lower and middle Mesozoic aquifers and confining units Mesaverde aquifer unconsolidated- confining unit confining unit aquifer deposit aquifers