- Usage in publication:
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- Newton Lake Formation*
- 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): 1) mafic member--mostly pillowed mafic lava, diabasic gabbro, differentiated mafic-ultramafic sills, intermediate-mafic pyroclastic rocks and siliceous marble; 2) felsic member--contains felsic-intermediate pyroclastic rocks and felsic lavas. Combined estimated thickness for both members at least 2,350 m. Overlies Knife Lake Group in central part and Lake Vermilion Formation in western part of Vermilion district. Generalized geologic map, geologic evolution chart. Is Precambrian W 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 ([ ]).