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National Geologic Map Database

General Information

  • Title: Geologic map showing thickness of the Upper Cretaceous Pierre Shale in the north half of the Powder River Basin, southeastern Montana and northeastern Wyoming
  • Author(s): Denson, N.M., Gibson, M.L., and Sims, G.L.
  • Publishing Organization: U.S. Geological Survey
  • Series and Number: Miscellaneous Investigations Series Map I-2380-A
  • Publication Date: 1993
  • Map Scale: 1:200,000
  • Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.