Usage:
Tiskilwa Formation of Wedron Group (IL)
Tiskilwa Member of Zenda Formation (WI)
Geologic age:
Quaternary (Pleistocene)
Type section, locality, area and/or origin of name:
Type section: Buda East section, roadcut 5 mi (8 km) northwest of Tiskilwa, IL, in SE/4 SE/4 SW/4 sec. 31, T. 16 N., R. 8 E., [approx. Lat. 41 deg. 19 min. 20 sec. N., Long. 89 deg. 37 min. 00 sec. W.], Buda 15-min quadrangle, Bureau Co., western northern IL (Willman and Frye, 1970; see also Mickelson and others, 1984; Syverson and others, 2011).
Named from village of Tiskilwa, Buda 15-min quadrangle, southern Bureau Co., western northern IL (Willman and Frye, 1970).
Reference section (=Zenda Formation type section): roadcut on south side of County Trunk Highway B, east of its intersection with Hillside Road, 1.1 mi (1.8 km) northeast of the locality of Zenda, in NW/4 NW/4 SW/4 sec. 26, T. 1 N., R. 17 E., [approx. Lat. 42 deg. 30 min. 58 sec. N., Long. 88 deg. 27 min. 42 sec. W.], Lake Geneva 7.5-min quadrangle, Walworth Co., southeastern WI (Mickelson and others, 1984; Syverson and others, 2011).
AAPG geologic province:
Illinois 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 ([ ]).