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Geologic Unit: Traders
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  • Usage in publication:
    • Traders iron-bearing member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Lake Superior region
Publication:

James, H.L., 1958, Stratigraphy of pre-Keweenawan rocks in parts of northern Michigan, IN Shorter contributions to general geology, 1957: U.S. Geological Survey Professional Paper, 314-C, p. C27-C44. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp314C]


Summary:

Is the basal member of Vulcan iron-formation in revised Menominee group (reinstated) of Animikie series, Iron and Dickinson Cos, northwest MI in the Lake Superior region. Stratigraphic sequence chart. Underlies Brier slate member. Is middle Precambrian in age.

Source: GNU records (USGS DDS-6; Reston 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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