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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Georgian Bay Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Shale
Publication:

Liberty, B.A., 1969, Paleozoic geology of the Lake Simcoe area, Ontario: Canada Geological Survey Memoir, 355, p. 1-201.


Summary:

Gray carbonate beds and blue and gray shale in the Lake Simcoe district, Ontario, are here named the Georgian Bay Formation of the Nottawasaga Group. Lower and upper informal members comprise the combined strata of the biostratigraphic Dundas and Meaford units. Overlies the Whitby Formation; underlies the Queenston Formation. Thickness is 130 m. Age is Late Ordovician (Cincinnatian).

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Georgian Bay Formation
  • Modifications:
    • Principal reference
  • AAPG geologic province:
    • Michigan basin
Publication:

Elias, R.J., 1982, Latest Ordovician solitary rugose corals of eastern North America: Bulletins of American Paleontology, v. 81, no. 314, p. 1-116.


Summary:

Georgian Bay Formation is geographically extended to Drummond Island, Chippewa Co., MI, where a lectotype section is designated.

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 ([ ]).