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Clays in region adjoining the Howell Hollow area 23
Southern Calhoun County area 29
21 other sections not shown
Anna kaolin anticline articular basal disc beds bleaching brick briquets buff calcareous Calhoun County calyx carbonate cherty clay products coal market area Color concave Cone consumption cottonseed oil crinoids crystalline dark dehydration deposits Devonian diameter Divine limestone dolomitic electrical electrical breakdown electrode emulsion feet flint clay fluorspar formation Limestone formation Shale fuel fuller's earth Geol Geologic Section Geological Survey glass glauconite granular gravel Greene County holotype Howell Hollow area Illinois coal market Illinois State Geological industry J. M. Weller Jersey County KALLIMORPHOCRINUS Kimmswick Kinderhook Kinderhook group light gray mineral Mississippian Mississippian system Iowa Missouri montmorillonite Olmstead oral crown Osage group outcrops oxide Pennsylvanian posterior probably quartz radials refractory Sample sand Sandstone sandy shale shrinkage per cent silica species specimens steel hard stem facet structure surface system Iowa series Table temperature tests thick tons U. S. Patent upper