Iowa Geology, Issues 19-24Iowa Geological Survey., 1994 - Geology |
Other editions - View all
Common terms and phrases
ADWs agricultural alachlor alluvial aquifers aquifer atrazine basin bedrock Big Spring bluffs building stone channel Clayton County construction contamination crater Cretaceous crystals cycad database Department of Natural Devonian Dodge dolomite drainage drilled earth materials eastern Iowa erosion feet floodplain flow Fort Dodge fossils geologic mapping geologic past Geological Survey Bureau geologists glacial meltwater glacier groundwater Gull Point gypsum Iowa Department Iowa River Iowa State University Iowa's geologic Jean Cutler Prior karst Keosauqua Lacey-Keosauqua State Park Lake land surface layers limestone Linn County located loess lowa lowa's melting meltwater floods Metolachlor miles million years ago mineral Mississippi River Moines Lobe Natural Resources nitrate-N nitrogen outcrops paleokarst Park pesticide prairie protection area quarried Ray Anderson region rift River valley rock sand and gravel sandstone sediments Seigley shallow silt sinkholes Sioux soil sources state's streams terrain thick tion vulnerable wetlands