Arikaree Formation
Stratigraphic range: late Oligocene to early [1]Miocene PreꞒ Ꞓ O S D C P T J K Pg N
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

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