State | Colorado |
---|---|
Name | Rocks of Pikes Peak Batholith (1000-m.y. age group) |
Geologic age | Middle Proterozoic |
Lithologic constituents |
Major
Igneous > Plutonic > Granitic > Alkali-feldspar-granite
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 | Clear Creek - Douglas - El Paso - Jefferson - Park - Teller |