Annual Report for ... with Accompanying PapersPublished for the Iowa Geological Survey, 1943 - Geology |
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average bedrock beds boulders Brick and Tile brown calcareous Cambrian carbonaceous cemented coal coarse-grained color County Creek Cretaceous deposits dolomite drift sheet east erosion exposed exposure Figure fine-grained formation fossils Geology glacial glacial stage glauconitic grade gravel gumbotil Illinoian drift Illinoian gumbotil Iowa Iowa Geol Iowan drift Iowan glacial substage Kansan drift Kansan gumbotil Leverett light buff light gray limestone Loveland Loveland loess Madison Mankato Mankato drift mantle material miles Moines series moraine Nebraskan northeastern northwestern Iowa outcrops overlying oxidized and leached peat pebble band Peorian intraglacial substage Peorian loess percent phase plant Pleistocene Polk County River rock samples sands and gravels Sandstone sandy Sangamon interglacial shales and clays silt siltstone silty Sioux square miles surface Survey terrace gravel Thickness Feet Inches thin topography Township unconsolidated underclay unleached unoxidized upland gravel upper valley weathering Webster County well-sorted western Wisconsin Woodbury County yellow zone