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Fort Union Formation - Tullock Member

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Soft gray sandstone, gray and brown carbonaceous shale, and thin coal beds.
State Wyoming
Name Fort Union Formation - Tullock Member
Geologic age Paleocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Coal
Comments Oldest of the 3 Fort Union members
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 Campbell - Converse - Crook - Johnson - Natrona - Niobrara - Sheridan - Weston