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| Archean - unnamed strata (1) |
| Cambrian - Eolus granite; Twilight granite; Ignacio quartzite (1) |
| Carboniferous - Cutler formation; Rico formation; Hermosa formation; Molas formation; Ouray limestone (1) |
| Cretaceous - Mancos shale; Dakota sandstone (1) |
| Devonian - Ouray limestone; Elbert formation (1) |
| Geology -- Colorado -- Dolores County -- Maps (1) |
| Geology -- Colorado -- La Plata County -- Maps (1) |
| Geology -- Colorado -- Montezuma County -- Maps (1) |
| Geology -- Colorado -- San Juan County -- Maps (1) |
| Geology -- United States --Maps (1) |