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• Drill Hole #2C - Overburden <br /> <br />Depth Thickness <br />(Feet) Strata (Feet) <br />39.9 Coal #2 (L. Dakota) 0.1 <br />40.0 Coal 5.2 <br />45.2 Shale 1.2 <br />46.4 Sandstone 0.8 <br />47.2 Gray shale 2.8 <br />50.0 ~C1PAL DEPTH <br />• <br />C <br />6-1-7 <br />