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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- U.S. Geological Survey
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.