Usage:
No current usage.
(†Jamestown Limestone of Carbondale Group (IL-local) replaced with Conant Limestone Member of Carbondale Formation. See Conant.)
Geologic age:
Pennsylvanian
Type section, locality, area and/or origin of name:
Type locality: in NW/4 NE/4 sec. 34, T. 5 S., R. 4 W., in vicinity of Jamestown, Perry Co., southern IL (Bell and others, 1931).
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 ([ ]).