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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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A thrust fault with displacement up to 1.5 feet was noted, as well as some localized thrust faults with less than 1 foot of displacement. The thrust faults were laterally discontinuous. The roof was limestone near the slope bottom. Limestone roof materials were sometimes thin or discontinuous. The limestone was likely Brereton Limestone in some areas, but the Conant Limestone was also seen in the Marissa Mine. Anna Shale made the roof in some areas, and joints and slips were usually widely spaced in this black shale. Some areas of black shale roof contained concretions. Slips were common where the roof was Energy Shale, and the coal under the gray shale sometimes contained concretions in the upper part of the seam. A set of slips, oriented northwest southeast, southwest of the air intake shaft marked a boundary between good and bad roof. The bad roof had many slips, and appeared to have thin or no limestone in the sequence above the coal. The coal was generally 5.5 feet thick under limestone roof and up to 7.5 feet thick under black shale. Pyrite was present in the coal as stringers, thin bands and goat beards. The blue band was about 1 foot from the bottom of the coal.
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