Usage:
Chamberlain Pass Formation of White River Group (SD)
Geologic age:
Eocene, middle(?)
Eocene, late
Type section, locality, area and/or origin of name:
Type section: excellent exposures just east of Badlands National Park, at Chamberlain Pass, in NW/4 sec. 35, T. 2 S., R. 20 E., Jackson Co., west-central SD. Named from local landmark (Evans and Terry, 1994).
AAPG geologic province:
Sioux uplift
Williston basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).