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Absaroka Volcanic Supergroup: Washburn Group

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Includes Sepulcher Formation (andesitic and dacitic volcaniclastic rocks), Lamar River Formation (andesitic lava and volcaniclastic rocks), and Cathedral Cliffs Formation (light-colored andesitic volcaniclastic rocks).
State Wyoming
Name Absaroka Volcanic Supergroup: Washburn Group
Geologic age Eocene
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Dacite
Igneous > Volcanic > Mafic-volcanic > Andesite
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
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Counties Park