Kba BAXTER SHALE Kc CODY SHALE Kcf CODY SHALE AND FRONTIER FORMATION Ks STEELE SHALE Ksn STEELE SHALE AND NIOBRARA FORMATION Kn NIOBRARA FORMATION Knt NIOBRARA AND FRONTIER FORMATIONS, AND MOWRY AND THERMOPOLIS SHALES Kf FRONTIER FORMATION Kft FRONTIER FORMATION AND MOWRY AND THERMOPOLIS SHALES Kmt MOWRY AND THERMOPOLIS SHALES KJ CLOVERLY AND MORRISON FORMATIONS KJs CLOVERLY, MORRISON, AND SUNDANCE FORMATIONS Js SUNDANCE FORMATION @c CHUGWATER FORMATION OR GROUP--Includes overlying Jelm Formation in Shirley and Seminoe Mountains and at northern end of Laramie Basin @Pcg CHUGWATER AND GOOSE EGG FORMATIONS @Pjs JELM AND CHUGWATER FORMATIONS, FORELLE LIMESTONE, AND SATANKA SHALE @Pg GOOSE EGG FORMATION MzPz MESOZOIC AND PALEOZOIC ROCKS--Shown in small areas of complex structure South side of Granite Mountains north of Green Mountain--Nugget Sandstone, Chugwater and Goose Egg Formations, Tensleep Sand- stone, and Amsden Formation (Jurassic? through Upper Mississip- pian) South flank of Ferris Mountains--Nugget Sandstone and Chugwater and Goose Egg Formations (Jurassic? through Permian) Northeast flank of Seminoe Mountains--Cloverly, Morrison, Sundance, Chugwater, and Goose Egg Formations (Lower Cretaceous through Permian) West flank of Sierra Madre--Chugwater, Goose Egg, Casper, and Foun- tain Formations (Upper Triassic through Middle Pennsylvanian) East flank of Laramie Mountains--Cloverly, Morrison, Sundance, Chug- water, and Goose Egg Formations, and, east of fault in T. 19 N., Casper Formation (Lower Cretaceous through Middle Pennsylvanian) Pfs FORELLE LIMESTONE AND SATANKA SHALE P&c CASPER FORMATION P&cf CASPER AND FOUNTAIN FORMATIONS P&M CASPER FORMATION AND MADISON LIMESTONE PM TENSLEEP SANDSTONE AND AMSDEN FORMATION Mm MADISON LIMESTONE Pzr MADISON LIMESTONE AND CAMBRIAN ROCKS _r CAMBRIAN ROCKS NORTHEAST Kl LANCE FORMATION Kfh FOX HILLS SANDSTONE Kp PIERRE SHALE Kn NIOBRARA FORMATION Knc NIOBRARA FORMATION AND CARLILE SHALE Kcl CARLILE SHALE Kgb GREENHORN FORMATION AND BELLE FOURCHE SHALE Kgbm GREENHORN FORMATION AND BELLE FOURCHE AND MOWRY SHALES Kmr MOWRY SHALE Kmt MOWRY AND THERMOPOLIS SHALES Kns NEWCASTLE SANDSTONE AND SKULL CREEK SHALE KJ CLOVERLY FORMATION (HARTVILLE UPLIFT) OR INYAN KARA GROUP (BLACK HILLS) AND MORRISON FORMATION Js SUNDANCE FORMATION Jsg SUNDANCE AND GYPSUM SPRING FORMATIONS @c CHUGWATER FORMATION @Ps SPEARFISH FORMATION @Pg GOOSE EGG FORMATION Pmo MINNEKAHTA LIMESTONE AND OPECHE SHALE Pzr MINNEKAHTA LIMESTONE, OPECHE SHALE, MINNELUSA FORMATION, PAHASAPA AND ENGLEWOOD LIMESTONES, WHITEWOOD DOLOMITE, AND WINNIPEG AND DEADWOOD FORMATIONS--Various combinations P&h HARTVILLE FORMATION--Lowermost unit may be Late Mississippian P&m MINNELUSA FORMATION MDe PAHASAPA AND ENGLEWOOD LIMESTONES MDg GUERNSEY FORMATION--Locally includes dolomite and sandstone of Devonian and Cambrian(?) age O_ WHITEWOOD DOLOMITE, AND WINNIPEG AND DEADWOOD FORMATIONS