Intrusive and extrusive igneous rocks

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
NGMDB product
Counties Crook