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  • Usage in publication:
    • Lake Vermilion Formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Lake Superior region
Publication:

Sims, P.K., 1976, Early Precambrian tectonic-igneous evolution in the Vermilion district, northeastern Minnesota: Geological Society of America Bulletin, v. 87, no. 3, p. 379-389.


Summary:

Part of greenstone-granite terrane of northern MN in the Lake Superior region. Consists of (decreasing abundance): 1) graywacke member--mostly graywacke with felsic-intermediate pyroclastic rocks; 2) felsic volcaniclastic member--partly reworked dacitic tuff and agglomerate; 3) mixed volcaniclastic member--felsic-intermediate tuff breccia; and 4) basaltic lavas. Exceeds 3000 m in thickness. Overlies Ely Greenstone and underlies Newton Lake 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.

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