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Alton argillaceous Battery Rock Bluff Borden Branson & Mehl brecciated brown buff calcareous carbonate Caseyville chert Chesterian clastic clay coal coarse Conodonts County crinoids cross-bedded crystalline deposits Devonian dolomite drilling Dutch Creek Fault feet thick feldspar feldspathic rock fragments figure fine-grained fluorspar Formation fossil fossiliferous Genevieve Genevieve Limestone Geological Survey glauconitic Gnathodus Grand Tower greenish gray Hicks Dome Illinois Basin Illinois Geol ILLINOIS STATE GEOLOGICAL inches thick isotopic Karbers Ridge Karbers Ridge Quadrangle light gray Lingle lithographic LOCALITY loess Louis Limestone lower Lusk massive medium grained mineral Mississippian Missouri Niagaran oolitic outcrop Overburden overlying Pennsylvanian percent potash feldspar Precambrian production quarry quartz Rexroad Rosiclare Salem Limestone samples sandy Sangamon Arch sediments shale shaly siltstone silty Silurian single bed soda-lime feldspar strata stratigraphic sublithographic Taphrognathus thin thin-bedded Total thickness unconformity unit upper Valley Willman