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Map showing publication footprint
  • Usage in publication:
    • Agate Bay group
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Lake Superior region
Publication:

Irving, R.D., 1883, The copper-bearing rocks of Lake Superior, IN Powell, J.W., Third annual report of the United States Geological Survey to the Secretary of the Interior, 1881-1882: U.S. Geological Survey Annual Report, 3, p. 89-188. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/ar/ar3]


Summary:

Pg. 143-146, pl. 14. Agate Bay group. Succession of relatively very thin beds with very highly vesicular stratiform amygdaloids, which must make up two-thirds of group; includes thin seams of reddish sandstones and conglomerates. Overlies Lester River group and underlies Beaver Bay group, all included in Keweenaw series. Age is Precambrian (Keweenawan).
Exposed on Agate Bay, northeast of Duluth, St. Louis Co., northeastern MN.

Source: US geologic names lexicon (USGS Bull. 896, p. 17).


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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