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National Geologic Map Database

General Information

  • Title: Geologic map of Morrill County, Nebraska with a section on new 40Ar/39Ar laser fusion ash dates from Wildcat Ridge, Nebraska
  • Author(s): Swinehart, J.B., Diffendal, R.F., and Swisher, C.C.
  • Publishing Organization: U.S. Geological Survey
  • Series and Number: Miscellaneous Investigations Series Map I-2496
  • Publication Date: 1995
  • Map Scale: 1:62,500
  • Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.