Ash Hollow Formation

Ash Hollow Formation
Stratigraphic range: Neogene
Ash Hollow Formation in Nebraska
TypeGeological formation
Unit ofOgallala Group
Location
RegionNebraska, South Dakota
CountryUnited States

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.

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