Usage:
Sylvan Lake Member of Copper Falls Formation (WI)
Geologic age:
Quaternary (Pleistocene; Wisconsinan)
Type section, locality, area and/or origin of name:
Type section: roadcut on south side of an east-west road [at south end of Sylvan Lake], in SE/4 SW/4 NW/4 sec. 14, T. 36 N., R. 13 W., [approx. Lat. 45 deg. 36 min. 15 sec. N., Long. 91 deg. 56 min. 44 sec. W.], Lower Vermillion Lake 7.5-min quadrangle, Barron Co., northwestern WI (Attig and others, 1988).
Named from Sylvan Lake, northern edge Lower Vermillion Lake 7.5-min quadrangle, Barron Co., northwestern WI; name credited to Mark D. Johnson (Attig and others, 1988).
Reference sections (Attig and others, 1988):
(1) till, in small borrow pit, east side of north-south road, in NW/4 SW/4 SW/4 sec. 20, T. 36 N., R. 12 W., [approx. Lat. 45 deg. 35 min. 03 sec. N., Long. 91 deg. 53 min. 18 sec.], eastern edge Lower Vermillion Lake 7.5-min quadrangle, Barron Co., northwestern WI;
(2) stream sediment, in a pit, in NE/4 SE/4 SE/4 sec. 36, T. 36 N., R. 13 W., [approx. Lat. 45 deg. 33 min. 24 sec. N., Long. 91 deg. 54 min. 42 sec. W.], Lower Vermillion Lake 7.5-min quadrangle, Barron Co., northwestern WI;
(3) lake sediment, in gravel pit, in SE/4 NW/4 SE/4 sec. 6, T. 33 N., R. 14 W., [approx. Lat. 45 deg. 22 min. 20 sec. N., Long. 92 deg. 08 min. 37 sec. W.], Clayton 7.5-min quadrangle, Barron Co., northwestern WI.
[Additional locality information from USGS historical topographic map collection TopoView, 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.
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