Chadron Formation
Appearance
Chadron Formation is a rock formation in North Dakota ,South Dakota and Nebraska. It is named after the town of Chadron, Nebraska. It was mapped out by Carl Vondra in the 1950s.[1]
References
- ^ Nebraska Academy of Sciences (1985). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. The Academy. p. 128. Retrieved 14 December 2012.