U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Chequamegon sandstone
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Thwaites, F.T., 1912, Sandstones of the Wisconsin coast of Lake Superior: Wisconsin Geological and Natural History Survey Bulletin, no. 25, 117 p.


Summary:

Named as top formation in Bayfield group (new). Named for exposures at Chequamegon Bay, Bayfield and Douglas Cos., northwestern WI (Upper Peninsula). Consists of red and white sandstones, predominantly composed of quartz grains, with thin, lenticular beds of red sandy shale. Thickness is 1,000 ft. Overlies Devils Island sandstone (new) of Bayfield group. Age is Precambrian (upper Keweenawan).

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


Map showing publication footprint
  • Usage in publication:
    • Chequamegon Formation
  • Modifications:
    • Age modified
    • Revised
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Mudrey, M.G., Jr., and Ostrom, M.E., 1986, Upper Keweenawan stratigraphy, Chapter IV, IN Mudrey, M.G., Jr., ed., Precambrian petroleum potential, Wisconsin and Michigan: Wisconsin Geological and Natural History Survey, Geoscience Wisconsin, v. 11, p. 23-25.


Summary:

Is part of Bayfield Group which is in turn assigned to Keweenawan Supergroup. Age is Middle Proterozoic, but data from Ostrom and Slaughter (1967) indicates a possible Cambrian age.

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


Map showing publication footprint
  • Usage in publication:
    • Chequamegon Sandstone*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Lake Superior region
Publication:

Morey, G.B., and Van Schmus, W.R., 1988, Correlation of Precambrian rocks of the Lake Superior region, United States, IN Harrison, J.E., and Peterman, Z.E., eds., Correlation of Precambrian rocks of the United States and Mexico: U.S. Geological Survey Professional Paper, 1241-F, p. F1-F31.


Summary:

Is youngest formation in Bayfield Group in northwest WI in Lake Superior region. Considered youngest Proterozoic sedimentary rocks in Lake Superior region. Is of fluvial and lacustrine origin and is compositionally distinct from underlying Oronto Group. Correlation charts. Normal magnetic polarity. Is considered Middle Proterozoic on basis of relative stratigraphic position, however, has been assigned a Late Proterozoic (King, 1976) or Cambrian (Ostrum, 1967) age.

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


Search archives

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:16:17 PM MDT