Upper Tertiary intrusive rocks

Intermediate to felsic compositions
State Colorado
Name Upper Tertiary intrusive rocks
Geologic age Tertiary
Lithologic constituents
Igneous > Hypabyssal > Mafic-hypabyssalintermediate
Igneous > Hypabyssal > Felsic-hypabyssalfelsite

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.

NGMDB product
Counties Dolores - Grand - Gunnison - Jackson - La Plata - Moffat - Routt - San Juan