Usage:
McDonough Member of Roxana Silt of Mason Group (IL*)
Geologic age:
Pleistocene (Wisconsinan Age)*
Type section, locality, area and/or origin of name:
Type section: Pleasant Grove School section, in borrow pits and roadcuts 1.6 km southeast of McDonough Lake, in SW/4 NE/4 SE/4 sec. 20, T. 3 N., R. 8 W., Madison Co., south-central IL. Named from McDonough Lake on the Mississippi River floodplain, Madison Co., south-central IL (Willman and Frye, 1970).
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 ([ ]).