Middle Tertiary intrusive rocks

Intermediate to felsic compositions
State Colorado
Name Middle Tertiary intrusive rocks
Geologic age Tertiary
Lithologic constituents
Major
Igneous > Hypabyssal > Felsic-hypabyssal
Igneous > Hypabyssal > Mafic-hypabyssalintermediate composition
References

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

NGMDB product
Counties Alamosa - Archuleta - Chaffee - Clear Creek - Conejos - Costilla - Custer - Delta - Dolores - Eagle - Fremont - Grand - Gunnison - Hinsdale - Huerfano - Jackson - Lake - Larimer - Las Animas - Mesa - Mineral - Montezuma - Ouray - Park - Pitkin - Prowers - Rio Grande - Routt - Saguache - San Juan - San Miguel - Summit - Teller