Usage:
Mount Rorah Coal Member of Tradewater Formation of Raccoon Creek Group (IL*)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
Type locality (corrected): ravine just east of the road at the northern edge of Stonefort village, in SW/4 NE/4 SE/4 sec. 25, T. 10 S., R. 4 E., Mount Rorah Church, now Mount Moriah Church, [Lat. 37 deg. 37 min. 08 sec. N., Long. 88 deg. 45 min. 49 sec. W., Creal Springs 7.5-min quadrangle, Williamson Co., southeastern IL] (Nelson and others, 1991).
Type locality: in SE/4 sec. 35, T. 10 S., R. 4 E., Williamson Co., southeastern IL. Named from Mount Rorah Church about 2 mi northwest of type outcrop (Kosanke and others, 1960).
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 ([ ]).