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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The roof was 30 feet of gray shale. The impurities in the seam were fairly abundant, and consisted of pyrite in lenses (2 inches by 8 inches maximum), sheets and balls, joint fillings and facings of calcite and gypsum up to 1/16th inch thick (apparently an important ash constituent of the bed), and a persistent clay band 8 to 10 inches above the floor. At least one horseback or roll was encountered.
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