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Fort Union Formation

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(Northwest, Southwest, and Central Wyoming) - Brown to gray sandstone, gray to black shale, and thin coal beds. (East Wyoming) - Light-colored massive sandstone, drab shale, and thick coal beds.
State Wyoming
Name Fort Union Formation
Geologic age Paleocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Coal
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 Big Horn - Carbon - Fremont - Hot Springs - Johnson - Natrona - Park - Sheridan - Sweetwater - Washakie