Landforms of the Northern Plains - Fine Art Print Map
The Northern Plains are overwhelmingly a lesson in the impact of ice.
Repeated glacial advances and retreats have alternated for nearly 3
million years, leaving the vast morainal deposits across the
Saskatchewan-Manitoba AND U.S. borders. All were re-shaped and smoothed
by outwash channels when ice blocked the present northward drainage into
Hudson Bay. Its retreat reversed the course of the Red River as far
south as Lake Traverse in the NE corner of South Dakota.
An earlier advance set the course of the Missouri well beyond the edge of the most recent ice limit.
