Abstract

The valley of the preglacial Missouri River can be traced from North Dakota into southeastern Saskatchewan. The preglacial Missouri River was joined by the preglacial Yellowstone River at a point about 15 miles north of the international border. Downstream from the junction the preglacial Missouri River flowed north of a highland in the vicinity of Estevan before entering Manitoba, where it joined the Red River to drain into Hudson Bay. Bedrock-surface contours show that the Missouri Coteau and Moose Mountain were uplands separated by a lowland, as at present.

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