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Map showing publication footprint
  • Usage in publication:
    • Tunnel City Group
  • Modifications:
    • First used
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Ostrom, M.E., 1966, Cambrian stratigraphy in western Wisconsin: Wisconsin Geological and Natural History Survey Information Circular, no. 7, 79 p.


Summary:

Tunnel City Group (new) includes all rock strata above Wonewoc Formation (new) and below St. Lawrence Formation. Includes Lone Rock Formation (new) and Mazomanie, herein raised to formation status.

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


Map showing publication footprint
  • Usage in publication:
    • Tunnel City Group
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Sand
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Ostrom, M.E., 1967, Paleozoic stratigraphic nomenclature for Wisconsin: Wisconsin Geological and Natural History Survey Information Circular, no. 8, 1 sheet.


Summary:

Author proposes that names Dresbach and Franconia be reserved for use as stage names in biostratigraphy and that names Elk Mound and Tunnel City be used as lithostratigraphic replacements with minor modifications. Tunnel City Group as defined consists of all strata above Elk Mound Group and below St. Lawrence Formation or Jordan Sandstone.

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


Map showing publication footprint
  • Usage in publication:
    • Tunnel City Formation
  • Modifications:
    • Revised
    • 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:

Tunnel City treated as formation in this report as its subdivisions could not be successfully mapped. [Tunnel City Group used by Clayton (1989: WI Info Circ 66) in neighboring Juneau Co.] Authors state unit has been recognized in southern WI, MI, IL, IN, MN and IA, but give no references. Lone Rock Member makes up all of the Tunnel City Formation in southwestern and southeastern WI. Mazomanie Member is a wedge in the middle of the Lone Rock in much of south-central WI. Along the crest of the Wisconsin arch, Tunnel City Formation consists largely of the Mazomanie. Unit is typically 30 to 45 m thick in Sauk Co. Consists for the most part of sandstone and fine to very fine sand. Overlies Wonewoc Formation; underlies St. Lawrence Formation; interfingers(?) Parfreys Glen Formation (new name) near Baraboo Hills.

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


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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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