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Oligocene and (or) Upper and Middle Eocene rocks

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Light-gray tuff, arkosic sandstone, and lenticular conglomerate.
State Wyoming
Name Oligocene and (or) Upper and Middle Eocene rocks
Geologic age Eocene-Oligocene
Lithologic constituents
Major
Sedimentary > Clastic > Conglomerate (Lens)
Igneous > Volcanic (Pyroclastic-tuff)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Comments COMU shows small box at Eocene/Oligocene boundary, then arrows down to roughly middle Eocene and up ending with a ? in the Oligocene.
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 - Sublette