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Frontier Formation and Mowry and Thermopolis Shales

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Frontier Formation (Kf) - Gray sandstone and sandy shale. In Northern Yellowstone area, Yellowish- to medium-gray sandstone; tuffaceous and carbonaceous in lower part. 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 Frontier Formation and Mowry and Thermopolis Shales
Geologic age Lower Cretaceous-Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Carbonate > Limestone
Incidental
Igneous > Volcanic > Felsic-volcanic (Pyroclastic-tuff)
Sedimentary > Clastic > Mudstone > Claystone > Bentonite
References

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.

https://pubs.er.usgs.gov/publication/70046739
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Counties Albany - Carbon - Converse - Fremont - Hot Springs - Johnson - Laramie - Park - Sheridan - Sublette - Teton