| State | Colorado |
|---|---|
| Name | Felsic and hornblendic gneisses, either separate or interlayered |
| Geologic age | Early Proterozoic |
| Lithologic constituents |
Major
Metamorphic > Gneissfelsic gneiss, mafic gneiss
Minor
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywacke
Metamorphic > Metaigneous > Metavolcanic > Metabasalt
|
| References | Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000. |
| NGMDB product | |
| Counties | Alamosa - Boulder - Chaffee - Clear Creek - Costilla - Custer - Eagle - Fremont - Garfield - Gilpin - Grand - Gunnison - Hinsdale - Huerfano - Jackson - Jefferson - Lake - La Plata - Larimer - Park - Pitkin - Pueblo - Routt - Saguache - San Juan - Summit |