National Geologic Map Database
General Information
- Title: Bentonite deposits of the northern Black Hills district, Montana, Wyoming, and South Dakota
- Author(s): Knechtel, M.M., and Patterson, S.H.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Mineral Investigations Field Studies Map MF-36 [2 sheets]
- Publication Date: 1956
- Map Scale: 1:48,000
- Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.