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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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This mine uncovered traces of several faults of the Shawneetown Fault Zone. Many thrust faults and some normal faults were seen. In one case, the Herrin Coal was triplicated in the section caused by large-scale thrusting. The south side of one thrust fault was up-thrown about 10 feet. The faulting caused displaced coal and made the coal elevation pitch and roll steeply, and caused instability of the highwall. In some pits, the Pleistocene material directly overlay the Herrin Coal and appeared to have cut down into the coal in some spots. The overburden over the Herrin Coal consisted of black Anna Shale (sometimes pods or not present at all), a thin layer (from a few inches thick up to 3 or 4 feet) of Brereton Limestone, gray Lawson Shale (from 2 to 15 feet thick), and Anvil Rock Sandstone. In some places the Anvil Rock Sandstone was present as a channel fill about 1,000 feet wide that had eroded down to within a few inches of the coal, and up to 50 feet thick in the channel phase. In two pits, concretions were commonly associated with the Herrin Coal. In one pit, the concretions were pyritic and weathered easily to a brown powdery material in the spoil pile. A few thin pyrite lenses were also present in the coal, as well as calcite and pyrite on cleat faces. At least one clay dike was seen in the Briar Hill Coal. The Dekoven Coal was overlain by 35 to 40 feet of hard gray silty shale with numerous thin beds of sandstone in the upper part.
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