Iowa Geology, Issues 15-20Iowa Geological Survey., 1990 - Geology |
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agricultural Allamakee County aquifer atrazine bedrock Big Spring boulders chemicals Clayton County climate coal contamination County Department of Natural detected Devonian DNR Geological Survey dolomite drilling Earth's earthquake eastern Iowa energy environment environmental feet fens flow fossil geologic mapping geologic materials Geological Survey Bureau geologists glacial deposits glacial erratics glacier groundwater groundwater supplies impact Iowa Geology Iowa's isotopic Johnson County Klum Lake land surface landscape limestone Linn County located loess Lohmann lowa lowa Department lowa's Madrid Fault Zone ment meteorite million years ago mineral Mississippi River Mitchell County Moines Lobe monitoring Muscatine Natural Resources nitrate concentrations nitrogen occur Park peat peatlands pesticides petroleum plant pollen post./hand potential produced protection quarries rainfall recharge region River valley rock rural samples sand and gravel sandstone sediments shale shallow sinkholes soil state's statewide stone stream studies tion vegetation vulnerable water quality western lowa wetland