Annual Report for ... with Accompanying Papers, Band 38

Allamakee County average bedrock beds boulders Brick and Tile brown calcareous Cambrian carbonaceous cemented ceramic Clay Products coal coarse-grained color County Creek deposits dolomite drift sheet east erosion exposed exposures 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 light buff light gray limestone lithology lobe Loveland loess Mankato Mankato drift mantle material mechanical analyses miles Moines series moraine Nebraskan northeastern northwestern Iowa outcrops overlying oxidized and leached peat pebble band Peorian intraglacial substage Peorian loess percent phase Pleistocene Polk County River rock samples sand and gravel Sandstone sandy Sangamon interglacial shales and clays silt siltstone silty Sioux square miles surface Survey terrace gravel thin topography Township underclay unleached unoxidized upland gravel upper valley weathering Webster County well-sorted Wisconsin Woodbury County yellow zone