Arikaree Formation
The Arikaree Formation, also Arikaree Group or Arikaree Sandstone is a geological unit in the central High Plains of the western United States. It preserves fossils dating to the late Oligocene to early Miocene.
| Arikaree Formation | |
|---|---|
| Stratigraphic range: late Oligocene to early | |
Arikaree Formation over Brule Formation (Pawnee Buttes, Colorado) | |
| Type | Formation / Group |
| Underlies | unconsolidated sediment |
| Overlies | Chadron Formation or Brule Formation |
| Thickness | up to 426.5 feet (130 m) |
| Lithology | |
| Primary | Siltstone, Sandstone |
| Other | Carbonate rock |
| Location | |
| Region | central High Plains |
| Country | United States |
| Type section | |
| Named for | Arikara Indians |
| Named by | N. H. Darton |
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