With the lower Minnesota valley blocked with ice, drainage from the waning Keewatin glacier, in southern Minnesota, would naturally be released into the Des Moines River, as indicated by the deep, gorge-like valley of the present stream above Des Moines City. Some recent observations on this phase of Iowa drainage are explained and charts presented. A now filled ancient channel is to be sought along the line of former long prairie lakes and the Blue Earth River, which in pioneer days formed part of the canoe-route of the trappers, from the head-waters of the Saskatchewan, in the Canadian Rockies, to the market in St. Louis.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
"Greater Des Moines River During Waning Glaciation,"
Proceedings of the Iowa Academy of Science, 43(1), 247-247.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/62