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This datafile shows the general elevation of the top of the Springfield (No. 5) Coal in Illinois. These 25-foot isolines were contoured by Earthvision software using over 22,400 data points from the ISGS Coal Section stratigraphic database. Limited data were available in the north central, central, and western portions of the state. The data was contoured using fault lines for control and manual adjustments were made to the contours to reflect the presence of known faults. Contours were adjusted in areas to eliminate crossing isolines of the elevation of the overlying Herrin Coal. 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