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20 feet Abbott Fm analyses anomaly Anticline aquifer Assistant Chemist Assistant Geologist Associate Chemist Associate Geologist average black shale and/or Cady clay mineral Clerk-Stenographer Coal H Coal N Coal N oc coal thickness coke coke oven curves cyclothem deposit depth drill Dykersburg Shale electric logs Emeritus estimated F oc face-channel samples feet thick fluorspar Franklin County G oc Gallatin County Geological Survey geothermal gradient H oc Hamilton County heat Herrin Illinois coals Illinois Geol Illinois State Geological inches kaolinite limestone low-sulfur coal mean sea level million tons mineral products mining mixed-layer moisture NW NW NW SW overlain by gray Pennsylvanian percent Ph.D profiles pyritic sulfur Rept Research Assistant Saline County sand sandstone soil temperature Spoon Fm structural Supervisory Technical Assistant SW NW SW SW Table thermal conductivity total sulfur Type underclay variation Wabash County White County Williamson County