Usage:
Cassa Member of Hartville Formation (NE,WY)
Cassa Member of Minnelusa Formation (SD)
Geologic age:
early Permian (Wolfcampian)
Type section, locality, area and/or origin of name:
Type locality: Buckshot Canyon (also called Ragan Canyon), in T. 29 N., R. 67 W., 3 mi northeast of Cassa, Platte Co., eastern WY (Condra and others, 1940).
AAPG geologic province:
Chadron arch
Denver basin
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 ([ ]).