National Geologic Map Database
General Information
- Title: Thickness of the upper Cretaceous rocks from the base of the Niobrara formation to the base of the Clay Spur bentonite (top of lower Cretaceous rocks), Powder River basin, Wyoming and Montana
- Author(s): Fox, J.E., and Higley, D.K.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Open-File Report OF-87-340-K
- Publication Date: 1987
- 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.