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  • Usage in publication:
    • Cedar Rapids Member
  • Modifications:
    • Revised
    • Overview
  • 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:

Assigned as the upper member of the Otis Formation, middle formation of the Wapsipinicon Group (rank raised). Overlies [Coggon] Member of Otis. Upper contact revised in that member underlies Kenwood Member of the newly named Pinicon Ridge Formation of the Wapsipinicon. Consists of thin- to medium-bedded limestone and dolomite. Member has rare gastropods and bryozoans, pelletal limestones with spirorbids, laminated carbonates with birdseye and mudcracks. Areal extent of Otis is east-central IA (Iowa shelf) and adjoining northwest IL (Wisconsin arch). Areal extent of Cedar Rapids not stated. Correlation charts. Graphic sections. Of early Middle Devonian, Eifelian age. Was a restricted marine deposit.

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


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

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