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White River Formation
"Stratigraphic range: "Eocene and "Oligocene "Epochs
Type "Formation
Sub-units "Brule Formation,
"Chadron Formation [1]
Overlies "Pierre Shale
Thickness 230–300 metres (750–980 ft) [2]
Primary tuffaceous "Claystone, "Conglomerate [3]
Region "Colorado,
"South Dakota,
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[edit]

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[edit]


  1. ^ a b c 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". 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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