sentences:  Glacial landforms are the common characteristics of this gerrymander-like region.The bedrock ranges in age from Archean granites to Upper Mesozoic Cretaceous sediments, and underlying the eastern part of the region (and the southerly extension to Iowa) are the Late Precambrian Keweenawan volcanics of the Midcontinent Rift, overlaid by thousands of meters of sedimentary rocks.At the surface, the entire region is "Moraine terrain", with the glacial landforms of moraines, drumlins, eskers, kames, outwash plains and till plains, all relics from recent glaciation.