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| Cretaceous - Laramie formation; Trinidad formation; Pierre shale; Apishapa formation; Timpas formation; Carlile shale; Greenhorn limestone; Graneros shale; Dakota sandstone (1) |
| Geology -- Colorado -- Las Animas County -- Maps (1) |
| Geology -- United States --Maps (1) |
| Neogene - Nussbaum formation (1) |
| Paleogene - unnamed strata (1) |