|White River Formation|
Stratigraphic range: Late Eocene-Early Oligocene (Chadronian-Whitneyan)
|Thickness||230–300 m (750–980 ft)|
|Primary||Tuffaceous claystone, conglomerate|
|Extent||northern Great Plains & central Rocky Mountains|
|Named for||White River|
(Missouri River tributary)
The geologic formation preserves fossils dating back to the Eocene and Oligocene Epochs of the Paleogene Period, during the Cenozoic Era. It contains the most complete Late Eocene−Priabonian and Early Oligocene−Rupelian vertebrate record in North America.
- DonaldProthero.com: "Eocene-Oligocene climatic change in North America: the White River Formation"
- DouglasFossils.com: Paleontology and Geology of The White River Formation
- USGS: White River Formation
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 8 July 2014. CS1 maint: discouraged parameter (link)
- 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.