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National Geologic Map Database

General Information

  • Title: Preliminary integrated geologic map databases for the United States: Minnesota, Wisconsin, Michigan, Illinois, and Indiana [Superseded by Horton and others, 2017, U.S. Geological Survey, Data Series DS-1052]
  • Author(s): Nicholson, S.W., Dicken, C.L., Foose, M.P., and Mueller, Julie
  • Publishing Organization: U.S. Geological Survey
  • Series and Number: Open-File Report OF-2004-1355
  • Publication Date: 2004
  • Map Scale: 1:500,000
  • Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.