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The Des Moines Lobe is the part of the state last touched by the huge sheets of frozen water that invaded Iowa roughly 12,000 to 14,000 years ago. This huge glacier, the Des Moines Lobe, advanced through North and South Dakota and Minnesota and into north central Iowa, halting at what is now the city of Des Moines and in the process established the present course of the Raccoon River. Join Phil Kerr on a fascinating journey learning about the behavior and landforms left behind by this giant sheet of ice.