Hermosa Group
The Hermosa Group is a group of geologic formations in Utah and Colorado. It preserves fossils dating back to the Carboniferous period.
| Hermosa Group | |
|---|---|
| Stratigraphic range: Carboniferous | |
 Hermosa Formation near its type section, Hermosa, Colorado, US | |
| Type | Group |
| Sub-units | Honaker Trail Formation Paradox Formation Pinkerton Trail Formation |
| Underlies | Cutler Group |
| Overlies | Molas Formation |
| Lithology | |
| Primary | mudstone |
| Other | shale, limestone |
| Location | |
| Coordinates | 37.431°N 107.837°W |
| Region | Utah |
| Country | United States |
| Type section | |
| Named for | Hermosa Creek |
| Named by | Cross and Spencer |
| Year defined | 1899 |
Hermosa Formation exposed in a roadcut near Rico, Colorado.
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