Ash Hollow Formation
The Ash Hollow Formation of the Ogallala Group is a geological formation found in Nebraska and South Dakota. It preserves fossils dating back to the Neogene period. It was named after Ash Hollow, Nebraska and can be seen in Ash Hollow State Historical Park. Ashfall Fossil Beds State Historical Park is within this formation.
| Ash Hollow Formation | |
|---|---|
| Stratigraphic range: Neogene | |
Ash Hollow Formation in Nebraska | |
| Type | Geological formation |
| Unit of | Ogallala Group |
| Location | |
| Region | Nebraska South Dakota |
| Country | United States |
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