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Geologic Unit: Ozaukee
Map showing publication footprint
  • Usage in publication:
    • Ozaukee member
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
    • Conglomerate
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Raasch, G.O., 1935, Devonian of Wisconsin, IN Kay, G.F., and Trowbridge, A.C., Conference leaders, Upper Mississippi Valley, Iowa City, Iowa, to Duluth, Minnesota: Kansas Geological Society Guidebook for the Annual Field Conference, August 25-September 1, 1935, no. 9, p. 261-267., Prepared in cooperation with Iowa, Illinois, Wisconsin, and Minnesota geol. surveys


Summary:

Ozaukee member is new name for upper and major part of Lake Church formation. Unit is firm, fairly thick-bedded brown to dark-gray pyritiferous dolomite with strong basal conglomerate. Fauna differs somewhat from that of underlying Belgium member of Lake Church formation, but is closely related. Ozaukee is 27 ft thick. Overlain by basal conglomerate of Thiensville formation. Rests on Niagara dolomite. Is cut out south of Milwaukee-Ozaukee Co. line, where Thiensville formation overlaps onto Niagaran. Named for Ozaukee Co.

Source: GNU records (USGS DDS-6; Reston 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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