Pg. 4 (table 1); App., p. A6-1 to A6-7. Zenda Formation. Willman and Frye's (1970) Capron and Tiskilwa Members (pink, calcareous, medium-grained tills) of Winnebago Formation, of central northern Illinois, are extended into southern Wisconsin as members of Zenda Formation (new). The Zenda occurs in the Lake Michigan Lobe in Walworth County, southeastern Wisconsin. Overlies Clinton Member of Walworth Formation (both new). Underlies New Berlin Formation (new) with sharp to gradational contact, or is the surface unit. Age is Pleistocene (Wisconsinan).
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.
Named from community of Zenda, southwestern corner Lake Geneva 7.5-min quadrangle, Walworth Co., southeastern WI; name credited to Allan F. Schneider.
Reference sections (Willman and Frye, 1970):
(1) Capron North section (=type section of Capron Member), roadcut 3 mi (5 km) north of Capron, in NE/4 SE/4 SE/4 sec. 23, T. 46 N., R. 4 E., [approx. Lat. 42 deg. 26 min. 44 sec. N., Long. 88 deg. 43 min. 34 sec. W.], Capron 7.5-min quadrangle, Boone Co., northeastern IL.
(2) Buda East section (=type section of Tiskilwa Member), 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.
[Additional locality information from Syverson and others, 2011, Wisconsin lexicon of Pleistocene units, Wisconsin Geol. Nat. Hist. Survey Tech. Rpt., no. 1; supplemented from USGS historical topographic map collection TopoView and Wisconsin Highways www.wisconsinhighways.org, accessed on June 9, 2018.]

Source: Publication; US geologic names lexicon (USGS Bull. 1565, p. 364).