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Map showing publication footprint
  • Usage in publication:
    • Rowley Creek slate
  • Modifications:
    • Named
  • Dominant lithology:
    • Slate
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Leith, Andrew, 1935, The pre-Cambrian of the Lake Superior region, the Baraboo district, and other isolated areas in the Upper Mississippi Valley, 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. 320-332., Prepared in cooperation with Iowa, Illinois, Wisconsin, and Minnesota geol. surveys


Summary:

Rowley Creek slate does not outcrop. Known only from drill records of 8 holes in east part of Baraboo district, all of which passed through Cambrian sandstone, Rowley Creek slate, and underlying Dake quartzite. Occupies middle of synclinal trough where found but is apparently absent over most of district. Thickness 40 to 149 ft. Gray on fresh surface but oxidized to red along some bedding and cleavage surfaces. Dominantly sericitic. Contains some chlorite and quartz. Is folded; bedding inclined from 20 degrees to 60 degrees. Named for small creek that flows through east part of Baraboo syncline immediately above the known occurrence of the slate. Assigned to Algonkian.

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


Map showing publication footprint
  • Usage in publication:
    • "Rowley Creek slate"
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Clayton, Lee, and Attig, J.W., 1990, Geology of Sauk County, Wisconsin; With a section about the Precambrian geology by B.A. Brown and an appendix naming the Rountree Formation by J.C. Knox, D.S. Leigh, and T.A. Frolking: Wisconsin Geological and Natural History Survey Information Circular, IC 67, 68 p., (incl. geologic map, scale 1:100,000)


Summary:

"Rowley Creek slate," as defined by Leith (1935), overlies "Dake quartzite" and unconformably underlies Cambrian Mount Simon Formation of Elk Mound Group in Sauk Co. Apparently similar to Seeley Formation. No outcrop known. Drillhole logs upon which unit definition was based are no longer available. Age shown as Early Proterozoic.

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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