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National Geologic Map Database
Geologic Unit: Coutchiching
Map showing publication footprint
  • Usage in publication:
    • Coutchiching Group*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Lake Superior region
Publication:

Day, W.C., 1990, Petrology of the Rainy Lake area, Minnesota, USA; implications of petrotectonic setting of the Archean southern Wabigoon subprovince of the Canadian Shield: Contributions to Mineralogy and Petrology, v. 105, no. 3, p. 303-321.


Summary:

Extended from ON, CN into MN part of Rainy Lake area within western extension of Wabigoon subprovince of Superior Province (Lake Superior region). As area is highly deformed, stratigraphic relations cannot be extended for more than a few km along strike. Consists mostly of graywacke, pelite and minor amphibolite which have undergone regional metamorphism. Overlies Keewatin Group; is older than intrusive rocks. Is part of Late Archean (2.7 Ga) granite-greenstone belt in Rainy Lake area.

Source: GNU records (USGS DDS-6; Denver GNULEX).


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 ([ ]).

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