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Frontier Formation

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(Thrust Belt) - White to brown sandstone and dark-gray shale; oyster coquina in upper part; coal and lignite in lower part. (North and South Wyoming) - Gray sandstone and sandy shale.
State Wyoming
Name Frontier Formation
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Incidental
Sedimentary > Coal
Sedimentary > Coal > Lignite
Sedimentary > Carbonate > Limestone > Coquina
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
NGMDB product
Counties Albany - Big Horn - Carbon - Converse - Fremont - Hot Springs - Johnson - Lincoln - Natrona - Park - Sheridan - Sublette - Teton - Uinta - Washakie