No current usage.
(Rocks of †Central Mine Group (MI) reallocated to Portage Lake Volcanics. See Portage Lake.)
Mesoproterozoic
Central Mine, in secs. 24, 25, and 36, T. 58 N., R. 31 W., Keweenaw Co., northern MI (Upper Peninsula) (Lane and Seaman, 1907).
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 ([ ]).