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Showing 1 to 1 of 1 for “"Geology--North Dakota; Geology--Williston Basin; Formations (Geology)--North Dakota"”.
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The Spearfish Formation in the Williston Basin of western North Dakota
… of the Black Hills has been traced into the Williston Basin of western North Dakota. In the basin, the formation can be divided into three members. In ascending order these are: (1) a lower gray shale and red siltstone unit herein named the Belfield Member, (2) a middle salt unit, the Pine …