- Usage in publication:
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- Knife Lake Group*
- Modifications:
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- Overview
- AAPG geologic province:
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- Lake Superior region
Summary:
Part of greenstone-granite terrane of northern MN in the Lake Superior region. Consists of (decreasing abundance) felsic-intermediate pyroclastic rocks, graywacke, carbonaceous slate, mixed pyroclastic and epiclastic conglomerate, iron-formation, and mafic flows. Estimated thickness about 4,500 m. Overlies Ely Greenstone and underlies Newton Lake Formation in central part of Vermilion district. Generalized geologic map and geologic evolution chart. Is 2,700-2,750 m.y. old, or Late Archean in age.
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 ([ ]).