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Intrusive and extrusive igneous rocks

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Incorporates masses of Mississippian through Cambrian formations. Confined to Black Hills.
State Wyoming
Name Intrusive and extrusive igneous rocks
Geologic age Eocene
Lithologic constituents
Major
Igneous > Plutonic
Igneous > Volcanic
Comments both ends of COMU box are ?
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 Crook