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amount analyses annual anomaly aquifer Assistant Geologist Associate Geologist average barrels Blend Cady Chemist clay mineral coke contain Cool cost County cubic curves deposit depth distribution drill eastern electric logs Emeritus Engineer estimated factors feet Figure fuel gasoline gradient gray shale Head heat holes Illinois Illinois Geol inches increase indicated less limestone low-sulfur lower material mean Member miles million tons mineral mines moisture natural normal nºw occurs Operations organic sulfur overlain percent Ph.D plants position Preheat present production pyritic sulfur range region relatively Research reserves resistivity rocks Saline samples sand shown shows soil sources Spoon Fm structural sulfur content supply surface Sw Sw Table Technical Assistant temperature tests thickness trillion Type underclay United University variation White