No current usage.
(†DeLong cyclothem (informal) (IL) considered obsolete.)
Pennsylvanian
Type exposure: along Brush Creek in secs. 5 and 8, T. 9 N., R. 2 E., Galesburg quadrangle, Knox Co., IL. Named from town of DeLong which is about 2.5 mi northeast of type exposure (Wanless, 1957).
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 ([ ]).