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Absaroka Volcanic Supergroup: Thorofare Creek and Sunlight Groups

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Thorofare Creek Group - Light-colored volcaniclastic strata, andesite lava flows, and dark-brown breccia; Sunlight Group - including Trout Peak Trachyandesite, Wapiti Formation (andesitic volcaniclastic rocks), Crescent Hill Basalt, and Mount Wallace Formation (felsic and mafic volcaniclastic rocks).
State Wyoming
Name Absaroka Volcanic Supergroup: Thorofare Creek and Sunlight Groups
Geologic age Eocene
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic-volcanic breccia, Flow, Pyroclastic-tuff)andesite and trachyandesite
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 Park - Teton