Usage:
No current usage.
(†Lusk Shale Member or †Lusk Member of Caseyville Formation (IL*,KY*) replaced with Wayside Member of Caseyville Formation. See Wayside.)
Geologic age:
Pennsylvanian, Early*
Type section, locality, area and/or origin of name:
Type locality: along Lusk Creek, in T. 12 and 13 S., R. 6 E., Pope Co., southeastern IL (Weller, 1940).
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 ([ ]).