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Absaroka Volcanic Supergroup: Thorofare Creek Group - Two Ocean and Langford Formations

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Dark-colored andesitic volcaniclastic rocks and flows underlain by light-colored andesitic tuffs and flows. In places may include Trout Peak Trachyandesite of Sunlight Group.
State Wyoming
Name Absaroka Volcanic Supergroup: Thorofare Creek Group - Two Ocean and Langford Formations
Geologic age Eocene
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff, Volcaniclastic, Flow)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 Fremont - Park - Teton