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Verified Coordinates: Latitude, Longitude (i.e 38.077,-89.030)
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The area was flooded annually by backwater from the Illinois River. The upper surface of the coal was irregular due to erosion, and most of the overburden was glacial till. The coal contained shale partings up to 1 inch, but most of these were separated during mining. The claystone floor was thin, but a firm base for the surface mining.
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