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

Witzke, B.J., Bunker, B.J., and Rogers, F.S., 1988, Eifelian through lower Frasnian stratigraphy and deposition in the Iowa area, Midcontinent, U.S.A., IN McMillan, N.J., Embry, A.F., and Glass, D.J., eds., Devonian of the World; proceedings of the 2nd international symposium on the Devonian System; Volume I, Regional synthesis: Canadian Society of Petroleum Geologists Memoir, 14, p. 221-250.


Summary:

Reassigned as middle member (of 3 members) of the Pinicon Ridge Formation (new) of Wapsipinicon Group (rank raised). Ranges between 4 to 7 m thick in most of IA on the Iowa shelf. Recognized in northern and eastern IA. Overlies Kenwood Member of Pinicon Ridge. Underlies Davenport Member of Pinicon Ridge. Dominated by thin- to medium-bedded dolomite. Is laminated. Breccias present near base and at other levels in the formation. Nodular to mosaic anhydrite present in lower part. Usually fossiliferous. Burrows, stromatolites, ostracods found. Ooids are present locally. Middle Devonian age. Nomenclature charts. Graphic sections.

Source: GNU records (USGS DDS-6; Denver 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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