Wells and Amsden Formations (TB), or Casper Formation and Madison Limestone (N, S) (WYPPAM;0)

WELLS AND AMSDEN FORMATIONS (Thrust Belt). WELLS FORMATION--Gray limestone interbedded with yellow limy sandstone. AMSDEN FORMATION--Red and gray cherty limestone and shale, sandstone, and conglomerate. CASPER FORMATION AND MADISON LIMESTONE (north, south Wyoming). CASPER FORMATION--Gray, tan, and red thick-bedded sandstone underlain by interbedded sandstone and pink and gray limestone. May include some Devonian(?) sandstone along east flank of Laramie Mountains. MADISON LIMESTONE--Includes Mission Canyon Limestone (blue-gray massive limestone and dolomite), underlain by Lodgepole Limestone (gray cherty limestone and dolomite).

State	Wyoming
Name	Wells and Amsden Formations (TB), or Casper Formation and Madison Limestone (N, S)
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian-Early Pennsylvanian-Middle(?) Pennsylvanian-Late(?) Permian
Original map label	P&M
Primary rock type	limestone
Secondary rock type	sandstone
Other rock types	shale; conglomerate; dolostone (dolomite)
Lithologic constituents	Major Sedimentary > Clastic > Sandstone Sedimentary > Carbonate > Limestone Minor Sedimentary > Carbonate > Dolostone Sedimentary > Clastic > Conglomerate Sedimentary > Clastic > Mudstone > Shale
Map references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Unit references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Geographic coverage	Albany - Carbon - Converse - Fremont - Laramie - Lincoln - Platte - Sublette