Usage:
Piasa Limestone Member of Shelburn Formation of McLeansboro Group (IL*)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
Type locality: along Piasa Creek, west of village of Piasa, in E/2 sec. 25, T. 8 N., R. 10 W., Brighton 15-min quadrangle, Jersey Co., southwestern IL (Wanless, 1956, Illinois Geol. Survey Circ., no. 217, p. 11; Kosanke and others, 1960).
Named from Piasa Creek which runs through southeast corner of Jersey Co., southwest corner of Macoupin Co., and northwest corner of Madison Co., southwestern IL (Culver, 1925).
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 ([ ]).