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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The coal had a steep pitch near the Cottage Grove fault, which prevented mining in its immediate proximity. Subsidiary faults were encountered, with up to 12 feet of displacement. Near the faults, the coalβs topography and thickness varied, but in some pits, the thickness had little variation. Other fault-related features were noted, including pulverized or shattered zones and slips. Coal balls were locally abundant. The top of the Herrin Coal was irregular and interbedded with shale. Three lenses of shale that were up to 4 feet thick were noted in a one-half mile face. The coal contained pyrite nodules.
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