White River Formation
Stratigraphic range: Eocene-Oligocene

Type| Formation
Sub-units| Brule Formation,
Chadron Formation [1]
Overlies| Pierre Shale
Thickness| 230–300 metres (750–980 ft) [2]
Lithology
Primary| Tuffaceous claystone, conglomerate[3]
Location
Region| Colorado,
Nebraska,
South Dakota,
Wyoming
Country| United States
Type section
Named for| White River
(Missouri River tributary)

The White River Formation is a geologic formation of the Paleogene Period, in the northern Great Plains and central Rocky Mountains, within the United States .

It has been found in northeastern Colorado, Dawes County in western Nebraska, Badlands of western South Dakota, and Douglas area of southeastern Wyoming.[1]

## Fossil record

The geologic formation preserves fossils dating back to the Eocene and Oligocene Epochs of the Paleogene Period, during the Cenozoic Era.[4] It contains the most complete Late Eocene−Priabonian and Early Oligocene−Rupelian vertebrate record in North America.[1][5]

## See also

* White River Formation prehistoric fauna
* Chadronian — Priabonian, Rupelian
* Orellan — Rupelian

## References

1. ↑ 1.0 1.1 1.2 DonaldProthero.com: "Eocene-Oligocene climatic change in North America: the White River Formation"
2. ↑ DouglasFossils.com: Paleontology and Geology of The White River Formation
3. ↑ USGS: White River Formation
4. ↑ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". http://www.fossilworks.org/. Retrieved 8 July 2014.
5. ↑ DigitalCommons@University of Nebraska - Lincoln: "Preliminary Biostratigraphy of the White River Group (Chadron and Brule Formations) in the Vicinity of Chadron, Nebraska", by Eric Paul Gustafson, January 1986.

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