Usage:
Keweenawan Supergroup (MI*,WI*,MN*)
Subunits:
Bergland Group (MI*,WI*), Bessemer Quartzite (MI*,WI*), Jacobsville Sandstone (MI*), Oronto Group (MI*,MN*,WI*), Powder Mill Group (MI*,WI*), Bayfield Group (WI*), Chengwatana Volcanic Group (WI*,MN*), Beaver Bay Complex (MN), Duluth Complex (MN*), Fond Du Lac Formation (MN*), Hinckley Sandstone (MN*), Hovland Diabase Complex (MN), North Shore Volcanic Group (MN*), Puckwunge Formation (MN), Reservation River Diabase Complex (MN), Solor Church Formation (MN).
Geologic age:
Precambrian*
Proterozoic, Middle*
Proterozoic, Late(?)*
Type section, locality, area and/or origin of name:
Exposures on Keweenaw Peninsula, northern MI (Brooks, 1876).
AAPG geologic province:
Lake Superior region*
Wisconsin arch*
Sioux uplift*
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 ([ ]).