| State | Colorado |
|---|---|
| Name | Intra-ash flow andesitic lavas |
| Geologic age | Tertiary |
| Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > Andesite
|
| References | Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000. |
| NGMDB product | |
| Counties | Archuleta - Chaffee - Conejos - Costilla - Custer - Fremont - Gunnison - Hinsdale - Mineral - Ouray - Park - Rio Grande - Saguache - San Juan |