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Middle and Lower Eocene Rocks

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Equivalent to Aycross (Ta) and Wind River (Twdr) Formations. Aycross Formation (Absaroka Volcanic Supergroup: Thorofare Creek Group) - Brightly variegated bentonitic claystone and tuffaceous sandstone, grading laterally into greenish-gray sandstone and claystone. In and east of Jackson Hole contains gold-bearing lenticular quartzite conglomerate. Wind River Formation - Variegated claystone and sandstone; lenticular conglomerate.
State Wyoming
Name Middle and Lower Eocene Rocks
Geologic age Lower Eocene-Middle Eocene
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Mudstone > Claystone (Tuffaceous)
Incidental
Sedimentary > Coal (Lens)
Sedimentary > Clastic > Conglomerate (Lens)
Comments COMU shows age with large arrow bar in both directions in Eocene.
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