| State | Colorado |
|---|---|
| Name | Unclassified surficial deposits and underlying Alamosa Fm in San Luis Valley |
| Geologic age | Quaternary-Tertiary |
| Lithologic constituents |
Major
Unconsolidated (Alluvial)
Minor
Unconsolidated > Coarse-detrital > Sand
Unconsolidated > Coarse-detrital > Gravel
Unconsolidated > Fine-detrital > Silt
Incidental
Unconsolidated > Fine-detrital > Clay
Sedimentary > Clastic > Conglomerate
|
| References | Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000. |
| NGMDB product | |
| Counties | Alamosa - Conejos - Costilla - Rio Grande - Saguache |