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Bridger Formation

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Greenish-gray, olive-drab, and white tuffaceous sandstone and claystone; lenticular marlstone and conglomerate.
State Wyoming
Name Bridger Formation
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Carbonate > Marlstone
Sedimentary > Clastic > Conglomerate
Incidental
Igneous > Volcanic (Pyroclastic-tuff)
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 Fremont - Lincoln - Sublette - Sweetwater - Uinta