Usage:
Fond du Lac Formation of Keweenawan Supergroup (MN*)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type section (composite): beginning along St. Louis River, Fond du Lac area, in sec. 6, T. 48 N., R. 15 W., [Esko 7.5-min quadrangle], St. Louis Co., northeastern MN, and Douglas Co., northwestern WI, and continuing westward along Little River, in sec. 1, T. 48 N., R. 16 W., [Esko 7.5-min quadrangle], Carlton Co., northeastern MN (Morey, 1967).
Named from exposures on both banks of St. Louis River from Fond du Lac [in St. Louis Co., northeastern MN], westward (US geologic names lexicon, USGS Bull. 1200).
AAPG geologic province:
Lake Superior region*
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 ([ ]).