WYOMING STATE GEOLOGICAL SURVEY Thomas A. Drean Director and State Geologist GEOLOGIC MAP OF THE POWDER RIVER BASIN, WYOMING Laramie, Wyoming Geology - Interpreting the past - providing for the future
107°30'W 107°0'W 106°30'W 106°0'W 105°30'W 105°0'W 104°30'W 104°0'W
45°0'N MONTANA
45°0'N
EXPLANATION
MAP SYMBOLS Formation contact
: Normal fault ( ( Thrust fault
_ ¨¦§8 0 U (/3 0 (!89 )"1
44°30'N
GEOLOGIC UNITS
44°30'N (Geology enlarged from 1:500,000 scale to improve readability)
CENOZOIC Cretaceous and Jurassic KJ Quaternary Qa KJs Qt KJg Qg Jurassic Qls Js Qs Jsg Qu Triassic Quaternary and Tertiary ^^c QTg ^^cd
Tertiary Tmu MESOZOIC AND PALEOZOIC ^Pcg^ Tml
A T O K A D H T U O S ^^Pg Tmo ^^Ps Twb MzPz Twr PALEOZOIC Twru Permian Tie 44°0'N Pp
Tw Pmo
44°0'N Twmo Permian and Pennsylvanian P*c* Twk P*h* Tfu P*m* Tftr
Tftl Permian, Pennsylvanian, and Mississippian
PM Tfl P*M* Tflt
Tft Mississippian Mm MESOZOIC
Cretaceous Mississippian and Devonian Kl MD Klm MDe MDg Kfh Kfl Mississippian and Ordovician Kfb MO Kmv
Kc Mississippian, Devonian, Ordovician, and Cambrian Pzr Kp 43°30'N Kn
Knc Ordovician Ob Kcl 43°30'N Ordovician and Cambrian Kgb O__ Kgbm Kf Cambrian Kft __u Kmr
Kmt PRECAMBRIAN ==u Kns
Kle
DATA REFERENCE BASE MAP REFERENCES 43°0'N 43°0'N A K S A R B E N
DISCLAIMERS
42°30'N
42°30'N NOTICE TO USERS OF INFORMATION FROM THE WYOMING STATE GEOLOGICAL SURVEY
BASIN LOCATION MAP
107°30'W 107°0'W 106°30'W 106°0'W 105°30'W 105°0'W 104°30'W
Map Projection: Lambert Conformal Conic Geology modified from Love and Christiansen (1985) False Easting: 500000, False Northing: 200000 Scale 1:350,000 Central Meridian: -107.5 degrees West Digital cartography and layout by Suzanne C. Luhr Standard Parallel 1: 41 degrees North 0 10 20 30 40 50 Edited by Phyllis A. Ranz and Suzanne C. Luhr Standard Parallel 2: 45 degrees North N Miles Latitude of Origin: 41 degrees North MN Linear Unit: Meter Horizontal Datum: North American Datum of 1983 (NAD 83) 0 20 40 60 80 Ellipsoid: Geodetic Reference System 80 Kilometers