Usage:
Michigamme Formation of Baraga Group of Marquette Range Supergroup (recognized locally in MI*,WI*)
Michigamme Slate of Baraga Group of Marquette Range Supergroup (recognized locally in MI*,WI*)
Notable exposures in Marquette Range, Menominee Range, and Iron River-Crystal Falls district, Northern Peninsula.
Subunits:
(alphabetical): Bijiki Iron-Formation Member (MI*), Clarksburg Volcanics Member (MI*), Greenwood Iron-Formation Member (MI*), Keyes Lake Quartzite Member (WI), Pine River Quartzite Conglomerate Member (WI).
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Extensive exposures on islands of Michigamme Lake and on mainland adjacent to shore in western Marquette Co., Marquette district, Northern Peninsula, northwestern MI (Van Hise and Bayley, 1895).
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 ([ ]).