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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The cap rock was 6 to 12 inches of limestone above 24 to 30 inches of black shale. Between the coal and black shale was 4 inches of draw slate. Horsebacks were abundant and bothersome. Because the clay in the horsebacks was difficult to separate from the adjacent coal, much coal was left as refuse. Impurities in the coal included pyrite lenses that were 1/8 inch thick and generally less than 2 feet long.
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