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Fowkes Formation

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Light-colored tuffaceous sandstone and siltstone, locally conglomeratic. Locally designated by some as Norwood Tuff.
State Wyoming
Name Fowkes Formation
Geologic age Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Minor
Igneous > Volcanic (Pyroclastic-tuff)
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Comments Upper part may be as young as Pliocene, according to COMU unit description. COMU box stops with a ? at Eocene/Oligocene boundary.
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 Lincoln - Uinta