Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>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. This data set is intended for use at a scale of 1:100,000.</SPAN></P></DIV></DIV>
Service Item Id: e75a4aac93c04cd5b285b1c00dba71f0
Copyright Text: Data capture, compilation and database maintenance: Marge Bargh, Colin Treworgy, and other ISGS Coal Section staff Compilation and export of data to create this product: Scott Elrick, Blair Tormey, and Chris Korose Documentation: Chris Korose and Andrew Louchios Quality Review: Russ Jacobson, Scott Elrick, and Chris Korose