Usage:
Pierce Formation (WI)
Subunits:
(alphabetical) --all in WI: Eau Galle Member, Hersey Member, Kinnickinnic Member, Woodville Member.
Geologic age:
late Tertiary to Quaternary (late Pliocene to early Pleistocene; pre-Illinoian)
Type section, locality, area and/or origin of name:
Type section (=Hersey Member type section): on west side of abandoned gravel pit north of WI Highway 12, about 0.6 mi (1 km) southwest of Hersey, in SW/4 SE/4 sec. 29, T. 29 N., R. 15 W., [approx. Lat. 44 deg. 57 min. 36 sec. N., Long. 92 deg. 13 min. 28 sec. W.], Wilson 7.5-min quadrangle, St. Croix Co., western WI (Mickelson and others, 1984; Syverson and others, 2011, Wisconsin Geol. Nat. Hist. Survey Tech. Rpt., no. 1).
Named from Pierce Co., western WI; name credited to Robert W. Baker (Mickelson and others, 1984; Syverson and others, 2011, Wisconsin Geol. Nat. Hist. Survey Tech. Rpt., no. 1).
Reference sections (Mickelson and others, 1984; Syverson and others, 2011, Wisconsin Geol. Nat. Hist. Survey Tech. Rpt., no. 1):
(1) in town of Woodville, at base of Chicago and Northwestern RR cut, in SE/4 NW/4 NW/4 sec. 35, T. 29 N., R. 16 W., [approx. Lat. 44 deg. 57 min. 26 sec. N., Long. 92 deg. 17 min. 43 sec. W.], Baldwin East 7.5-min quadrangle, St. Croix Co., western WI (=Hersey Member reference section);
(2) [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 (=Kinnickinnic Member type section); and
(3) north of County Trunk Highway FF, on east bank of tributary to Kinnickinnic River, 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 (=Kinnickinnic Member reference section).
[Additional locality information from USGS historical topographic map collection TopoView and Wisconsin Highways, www.wisconsinhighways.org; accessed on June 9, 2018.]
AAPG geologic province:
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 ([ ]).