Usage:
Karnak Limestone Member of Ste. Genevieve Formation (KY)
Karnak Member of Ste. Genevieve Limestone (IL,IN*)
Subunits:
Bryantsville Breccia Bed (IN)
Geologic age:
Middle Mississippian (Visean; early Chesterian)*
Type section, locality, area and/or origin of name:
Type section: exposures 4 mi northwest of Karnak, in SW/4 SW/4 SW/4 sec. 32, T. 13 S., R. 2 E., and NW/4 NW/4 NW/4 sec. 5, T. 14 S., R. 2 E., Dongola quadrangle, Johnson Co., IL (Swann, 1963).
AAPG geologic province:
Illinois 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 ([ ]).