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Granitic rocks of 1400-m.y. age group

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Includes Silver Plume, Sherman, Cripple Creek, St. Kevin, Vernal Mesa, Curecanti, Eolus, and Trimble Granites or Quartz Monzonites; also, San Isabel Granite of Boyer (1962) and unnamed granitic rocks
State Colorado
Name Granitic rocks of 1400-m.y. age group
Geologic age Middle Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Alkali-feldspar-graniteincludes peraluminous granites
Igneous > Plutonic > Granitic > Granite
Minor
Igneous > Plutonic > Syenitic > Quartz-monzonite
References

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
NGMDB product
Counties Archuleta - Boulder - Clear Creek - Costilla - Custer - Eagle - El Paso - Fremont - Grand - Gunnison - Hinsdale - Huerfano - Jackson - Jefferson - Lake - La Plata - Larimer - Mesa - Montrose - Park - Pitkin - Pueblo - Routt - Saguache - San Juan - Summit - Teller