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Map showing publication footprint
  • Usage in publication:
    • Milwaukee formation*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
    • Shale
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Alden, W.C., 1906, Milwaukee special folio, Wisconsin: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-140, 12 p., scale 1:62,500


Summary:

Milwaukee formation. Only lower 15 to 25 feet exposed, but following generalized section is based on exposures and well records (descending): black shale, 15 feet; soft bluish limestone and softer bluish "soapy clay," 31 feet. Very fossiliferous. Hamilton fauna (Middle Devonian). Overlies Waubakee formation. Underlies Pleistocene drift.
Named from exposures near Milwaukee, southeastern WI.

Source: US geologic names lexicon (USGS Bull. 896, p. 1378).


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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