Chadron Formation is a rock formation in North Dakota, South Dakota, northwestern Nebraska, and eastern Wyoming. It is named after the town of Chadron, Nebraska. It was mapped out by Carl Vondra in the 1950s.[1]
| Chadron Formation | |
|---|---|
| Stratigraphic range: Late Eocene ~ | |
 Chadron Formation in Badlands National Park, South Dakota | |
| Type | Geological formation |
| Unit of | White River Formation |
| Underlies | Brule Formation |
| Overlies | marine indet. |
| Lithology | |
| Primary | Fine grained clastic rocks |
| Other | Tuff, Sandstone |
| Location | |
| Region | Nebraska, Wyoming, North Dakota, South Dakota |
| Country | United States |
| Type section | |
| Named for | Chadron, Nebraska |
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References edit
- ^ Nebraska Academy of Sciences (1985). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. The Academy. p. 128. Retrieved 14 December 2012.
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