Annual Report for ... with Accompanying PapersPublished for the Iowa Geological Survey, 1894 - Geology |
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Appanoose Appanoose county argillaceous basin bituminous shale bluffs bottom of seam calcareous cannel clay seams Clay shale Coal Bed coal counties coal field Coal Measure strata Coal Measures coal seams coal vein compact considerable county line creek Cretaceous deposits Devonian district drift exposures extensive farther feet deep feet in depth feet in thickness Figure Fire clay Fire clay exposed fissile formation Fort Dodge four feet geological gray half a mile impure inches in thickness Iowa coal Keokuk known layers light colored Louis limestone Lower Carboniferous Lower Coal Measures Mahaska county Marion county middle of seam miles directly mines Missouri Moines river Nodaway river northwestern opened operated outcrops outliers portion present railroad Redrock region rocks roof Saint Louis limestone sandstone seams of coal shaft shaly short distance Skunk river slope strata stream surface Upper Coal Measures valley vein of coal vicinity