Dutchman Creek sandstone lentil (informal) of Drury Member of Caseyville Formation (IL)
Informal. The rank or lithologic term should not be capitalized.
Early to Middle Pennsylvanian (Morrowan)
Not designated. Measured section of Drury Member near and along a county road, in center NE/4 sec. 36, T. 11 S., R. 2 E., Goreville quadrangle, Johnson Co., IL. Origin of name not stated by author (Jacobson, 1992).
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 ([ ]).