Thin Elk Formation
# Thin Elk Formation

The Thin Elk Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.

## Fossil content

### Mammals

**Ungulates**

Ungulates reported from the Thin Elk Formation :

| Genus | Species | Presence | Material | Notes | Images |
| - | - | - | - | - | - |
| Cormohipparion | C. occidentale | Ed Ross Ranch Quarry, Bennett County, South Dakota. | Skull (F:AM 71872). | An equid. | |
