Usage:
Dykersburg Shale Member of Carbondale Formation (IL*)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
Outcrop on highwall of abandoned Delta Collieries Corp. strip mine, in SE/4 SE/4 NE/4 sec. 24, T. 9 S., R. 4 E., near Dykersburg, Williamson Co., south-central IL (Hopkins 1968).
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 ([ ]).