Annual Report for ... with Accompanying PapersPublished for the Iowa Geological Survey, 1900 - Geology |
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beds Big Sioux bluffs bowlders brick cave chert clay coal common crevice deposits depth Dickinson county dolomite drainage driftless area dry bone Dubuque county Eagle Point east Eldora erosion exposed exposures fauna formation fossils G Rep Galena Galena limestone Geol Geological glacial groves Hardin county hills horizon inches Iowa Falls Iowa river Iowan drift Kansan drift Kinderhook lake layers ledges Lime creek limestone Linn loess lower Lyon county Maquoketa material miles mineral mines Mississippi moraine Niagara occurs Okoboji Osceola oxide plant portion prairie present quarry quartzite region ridge Rock river sand sandstone shaft shale sheet Shell Rock Shell Rock river Sioux counties slopes soil species stone strata stream surface Surv Survey terrace thin tion topography township trees Trenton upper valley weathered White Wisconsin Wisconsin drift wood Worth county zinc