Usage:
Ferne Clyffe member (informal) of Tradewater Formation of Raccoon Creek Group (IL)
Informal. The rank or lithologic term should not be capitalized.
Subunits:
Reynoldsburg Coal Bed (IL-local).
Geologic age:
Early to Middle Pennsylvanian (Morrowan to Desmoinesian)
Type section, locality, area and/or origin of name:
Not designated. Measured section of sandstone facies in upper part of roadcut on Interstate 24, in NW/4 NW/4 sec. 8, T. 12 S., R. 3 E., Goreville quadrangle, Johnson Co., IL. Name derived from Ferne Clyffe State Park south of Goreville (Jacobson, 1992).
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 ([ ]).