Earth:Arikaree Formation
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| Arikaree Formation Stratigraphic range: late Oligocene to early[1]Miocene | |
|---|---|
 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[1] |
| Country | United States |
| Type section | |
| Named for | Arikara Indians[1] |
| Named by | N. H. Darton[1] |
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.[1]
See also
- List of fossiliferous stratigraphic units in North Dakota
- Paleontology in North Dakota
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "Geologic Unit: Arikaree". National Geologic Database. United States Geological Survey. https://ngmdb.usgs.gov/Geolex/Units/Arikaree_6535.html.
Template:Chronostratigraphy of Colorado
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