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analysis anhydrite aquifers average bedrock blend calcite carbonate cement chert chert nodules clay CM CM coal coal beds Coke core crude oil crystals dark gray depth dolomite dolomite or limestone drilling evaporite fault feet thick figure fluorspar formation Gallatin County Geological Survey glacial gravel deposits groundwater Grundy County gypsum holes host rock Illinois coal Illinois Geol Illinois State Geological inches thick indicated Kendall County Kozeny LaSalle light gray Livingston loess Lonsdale maps material methods mined mineral Mississippian network model nickel obtained occur outcrop overburden pendular ring Pennsylvanian percent permeability petroleum Pontiac pore produced Quarry quartz reservoir resin rodlets River Salem Saline Saline County samples sand and gravel sandstone seismic shale Shoal Creek shown shows silica sphere Stone strippable thin sections trace elements trace metals unconsolidated valley vanadium vesicles vitrinites water-yielding Williamson County zone