Usage:
Hersey Member of Pierce Formation (WI)
Geologic age:
late Tertiary to Quaternary (late Pliocene to early Pleistocene; pre-Illinoian)
Type section, locality, area and/or origin of name:
Type section (=Pierce Formation type section): on west side of abandoned gravel pit, 200 m north of Highway 12, and about 0.6 mi (1 km) southwest of Hersey, in SW/4 SE/4 sec. 29, T. 29 N., R. 15 W., [approx. 44 deg. 57 min. 36 sec. N., Long. 92 deg. 13 min. 30 sec. W.], Wilson 7.5-min quadrangle, eastern St. Croix Co., western WI. Named from Hersey; name credited to Robert W. Baker (Mickelson and others, 1984; see also Syverson and others, 2011).
Reference section: exposure in Chicago and Northwestern RR cut, in town of Woodville, 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 (Mickelson and others, 1984; see also Syverson and others, 2011).
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 ([ ]).