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Plutonic rocks

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Wind River Range--Largely granite gneiss; contains diorite and quartz diorite facies. Bighorn Mountains--Quartz diorite to quartz monzonite. Age 2,900+ Ma.
State Wyoming
Name Plutonic rocks
Geologic age Middle Archean-Late Archaen
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Quartz-monzonite
Igneous > Plutonic > Dioritic > Quartz-diorite
Metamorphic > Gneiss
Minor
Igneous > Plutonic > Dioritic > Diorite
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 Big Horn - Fremont - Johnson - Sheridan - Sublette