Usage:
Stonefort Limestone Member of Spoon Formation (IL*)
Stonefort Limestone Member of Tradewater Formation (KY*)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
In roadcut and in ravines east of road in NE/4 SE/4 sec. 25, T. 10 S., R. 4 E., Williamson Co., IL (Kosanke and others, 1960).
Named from exposures near Stonefort P.O. and station, Saline Co., southeastern IL (Henbest, 1928).
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 ([ ]).