Usage:
Wedron Group (IL*,IN*,MI*,WI*)
Subunits:
(alphabetical): Batestown Till (IN*), Fairgrange Till (IN), Holy Hill Formation (WI*), Kewaunee Formation (IL*,WI*), Lemont Formation (IL*), Oak Creek Formation (WI*), Snider Till (IN*), Tiskilwa Formation (IL*), Wadsworth Formation (IL*) or Wadsworth Till (IN*), Zenda Formation (WI*).
Geologic age:
Quaternary (Pleistocene; Wisconsinan)*
Type section, locality, area and/or origin of name:
Type section: in overburden of Wedron Silica Company No. 1 pit, south of Wedron on west side of Fox River, in SE/4 SE/4 SW/4 sec. 9., T. 34 N., R. 4 E., [approx. Lat. 41 deg. 25 min. 42 sec. N., Long. 88 deg. 46 min. 36 sec. W., Wedron 7.5-min quadrangle], LaSalle Co., northeastern IL (Frye and others, 1968).
AAPG geologic province:
Illinois basin
Michigan basin
Wisconsin arch*
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 ([ ]).