National Geologic Map Database
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                Title: The Spearfish Formation in the Williston Basin of western North Dakota
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                Author(s): Dow, W.G.
            
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                    Publishing Organization: North Dakota Geological Survey
            
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                Series and Number: Bulletin 52
            
- Publication Date: 1967
- Map Scale: 1:1,083,000
- Cross Section: Yes
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.