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National Geologic Map Database
Geologic Unit: Great
Map showing publication footprint
  • Usage in publication:
    • Great Conglomerate*
  • Modifications:
    • Not used
Publication:

White, W.S., 1972, The base of the Upper Keweenawan, Michigan and Wisconsin, IN Contributions to stratigraphy, 1971: U.S. Geological Survey Bulletin, 1354-F, p. F1-F23.


Summary:

Not used in Keweenawan Peninsula and adjacent areas of upper MI in Lake Superior region. Formerly was a named conglomerate unit below Lake Shore Trap (not used) of Copper Harbor Conglomerate. Stratigraphic chart. Is middle Precambrian 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 ([ ]).

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