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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Sinsinawa member
  • Modifications:
    • Areal extent
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Templeton, J.S., and Willman, H.B., 1952, Guidebook for the 16th annual field conference, central northern Illinois: Tri-State Annual Field Conference Guidebook, October 11-12, 1952, no. 16, 47 p., Also issued as Illinois State Geol. Survey Gdbk., 2nd ser., 1952. http://archive.org/details/guidebookforsixt02tris


Summary:

Figs. 3, 12. Sinsinawa member of Wise Lake formation. Thick-bedded dolomite, pure, brown, coarsely crystalline. Thickness 13 feet. Shown on columnar section as underlying Stewartville member (new) of Wise Lake formation and overlying Wyota member (new) of Dunleith formation. Age is Middle Ordovician.
[Notable exposures in Dixon-Oregon area, northern IL.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 3641).


Map showing publication footprint
  • Usage in publication:
    • Sinsinawa Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
Publication:

Sloan, R.E., 1987, Tectonics, biostratigraphy, and lithostratigraphy of the Middle and Late Ordovician of the Upper Mississippi Valley, IN Sloan, R.E., ed., Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations, no. 35, p. 7-20.


Summary:

Sinsinawa Member of Stewartville Formation of Galena Group. In Minnesota (Iowa shelf), Sinsinawa is assigned to Stewartville Formation (revised) as its lower member; underlies Rifle Hill Member (new). Age is Late Ordovician (Edenian). Report includes correlation chart, cross sections, graphic section. [See also entry under Rifle Hill.]

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


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).