Mowry and Thermopolis Shales

Mowry Shale (Kmr) - Silvery-gray hard siliceous shale containing abundant fish scales and bentonite beds. Thermopolis Shale - Black soft fissile shale; Muddy Sandstone Member at top.
State Wyoming
Name Mowry and Thermopolis Shales
Geologic age Lower Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Sandstone
Incidental
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
References
NGMDB product
Counties Albany - Big Horn - Carbon - Converse - Fremont - Hot Springs - Johnson - Natrona - Park - Platte - Sheridan - Sublette - Teton - Washakie