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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The immediate roof was a carbonaceous shale 3 to 4 inches thick. This held up well, but when it did come down, it was overlain by 15 feet of gray shale that caused trouble. Moisture caused the shale to swell and break and come down. The floor was over 5 feet of fire clay, but did not heave unless it got wet.
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