Usage:
Roca Shale of Council Grove Group (KS*,NE*,OK*)
Roca Shale of Vanoss Group (OK)
Geologic age:
early Permian (Wolfcampian)*
Type section, locality, area and/or origin of name:
Named from Roca, Lancaster Co., NE (Condra, 1927).
AAPG geologic province:
Salina 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 ([ ]).