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National Geologic Map Database

Geologic Unit: Munising

Usage:

Munising Formation (MI*)
Munising Formation of Lake Superior Group (MI)
Munising Group (MI)
Munising Group of Potsdam Supergroup (IN-subsurface)


Subunits:

Eau Glaire (MI,IN), Galesville (MI,IN), Ironton (IN), Fanconia Formation (MI,IN), and Davis Formation (IN) of Munising Group; Chapel Rock (MI*) and Miners Castle (MI*), Members of Munising Formation; Mount Simon Sandstone, Eau Claire, Dresbach Sandstone, and Franconia Sandstone Members of the Munising Formation (MI)


Geologic age:

Late Cambrian*


Type section, locality, area and/or origin of name:

Exposures in bluffs back of Munising, Alger Co., northern MI (Lane and Seaman, 1907).


AAPG geologic province:

Michigan basin*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).