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Arikaree Formation
Geological formation in midwestern US / From Wikipedia, the free encyclopedia
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]
Quick Facts Type, Underlies ...
Arikaree Formation | |
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Stratigraphic range: late Oligocene to early[1]Miocene | |
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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] |
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