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Geologic Unit: Kenwood
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  • Usage in publication:
    • Kenwood Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
    • Wisconsin arch
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 the basal (of 3 members) member of Pinicon Ridge Formation (new) of Wapsipinicon Group (rank raised). Recognized in northern and east-central IA on the Iowa shelf and in adjacent northern IL on the Wisconsin arch. Ranges between 4.5 to 8 m thick. Generally thicker in IA. Maximum thickness is 13 m in southeast IA. Overlies Spillville Formation of Wapsipinicon Group in northern IA; overlies Cedar Rapids Member, upper member of Otis Formation of Wapsipinicon Group in east-central IA. Dominated by thin-bedded, nonfossiliferous, argillaceous to shaly dolomite and dolomitic limestone with scattered to abundant quartz/chert silt and sand. Locally brecciated to intraclastic. Of Middle Devonian, late Eifelian and early Givetian 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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