Preglacial Missouri River in Saskatchewan

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.