Annual Report for ... with Accompanying PapersPublished for the Iowa Geological Survey, 1897 - Geology |
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Acervularia alluvium argillaceous beds blue bluff bowlders buff building stone calcareous Carboniferous Cedar Valley limestone Cerro Gordo county channel chert clay shale coal measures color common deposits depth Devonian dolomite drab drainage drift plain drift sheet east erosion exposed exposures feet Fire clay flood plain formation forms fossils geological glacial gravel gray Guthrie county hills horizon inches Iowa City Iowa river Iowan drift Johnson county Kansan drift kilns Kinderhook layers ledges Lime creek limestone lobe loess lower magnesian Marshalltown Mason City material miles mines Moines river moraine occur oölite outcrops Pleistocene Polk county portion preglacial present quarry Raccoon railway reef region ridge sand sandstone sandy seam shaft shaly Shell Rock river side slope soil species Spirifer strata stream stromatoporoids surface Surv thickness thin Timber creek tion topography township tributaries upper white limestone Wisconsin drift yellow