Usage:
Baraga Group of Marquette Range Supergroup (recognized locally in MI*,MN,WI*)
Notable exposures in Marquette Range, Menominee Range, and Iron River-Crystal Falls district, Northern Peninsula.
Subunits:
(alphabetical): Amasa Formation (MI), Badwater Greenstone (MI*,WI*), Copps Formation (MI*,WI*), Goodrich Quartzite (MI*), Hemlock Formation (MI), Michigamme Formation (MI*,WI*) or Michigamme Slate (MI*,WI*), Tyler Formation (MI*,WI*) or Tyler Slate (MI*,WI*).
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Named from Baraga Co., Northern Peninsula, northwestern MI, in which the rocks of this group are widely exposed (James, 1958).
AAPG geologic province:
Lake Superior region*
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 ([ ]).