Pg. 4 (table 1); App., p. A4-5 to A4-8. Kinnickinnic Member of Pierce Formation. (Follows the informal usage of R.W. Baker, 1984, Wisconsin Geol. Nat. Hist. Survey Gdbk, no. 11.) Is the upper member of Pierce Formation (new) in western Wisconsin. Consists of grayish brown to dark-gray, thinly laminated, calcareous, silt loam. Thickness 21+ m. Overlies Hersey Member (new) of Pierce Formation, contact is gradational. Underlies River Falls Formation (new), contact is sharp. In places is the surface unit. Interpreted to be of glacial lacustrine origin. Age is Pleistocene (pre-Illinoian).
Type section: [south of River Falls] in stream embankment about 400 m north of County Trunk Highway FF, in SE/4 SW/4 SW/4 sec. 12, T. 27 N., R. 19 W., [approx. Lat. 44 deg. 50 min. 03 sec. N., Long. 92 deg. 38 min. 09 sec. W.], River Falls West 7.5-min quadrangle, Pierce Co., western WI.
Named from the Kinnickinnic River, western St. Croix and Pierce Cos., terminating in the St. Croix River, 6 mi (10 km) north of Prescott.
Reference section: east bank of tributary to Kinnickinnic River, about 500 m north of County Trunk Highway FF, in SW/4 NW/4 sec. 15, T. 27 N., R. 19 W., [approx. Lat. 44 deg. 49 min. 48 sec. N., Long. 92 deg. 40 min. 48 sec. W.], River Falls West 7.5-min quadrangle, Pierce Co., western WI.
[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, USGS GNIS database, and Wisconsin Highways www.wisconsinhighways.org, accessed on June 9, 2018.]

Source: Publication; US geologic names lexicon (USGS Bull. 1565, p. 158-159).