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components making up the layers or rock beds consist mainly of <br />sandstones, normal and carbonaceous shales and clays. The <br />• stratum of interburden representing tho- roof of E seam is composed <br />of a 6" bed of oyster shell and extends several hundred yards <br />to the east and south. Another stratum, the roof for F seam, <br />shocas evidence of carbonate concretions in the vicinity of <br />drill hole G-42, Figure 1. One striking feature seen in this <br />same map is the washout of interburden and coal seams down <br />to the top of B seam, between drill holes G-42 and G-43, on <br />the east-west axis, thus exposing X and A seam coal to weathering <br />and oxidation. <br />Drill Log G-59 <br />Table I is a computer printout of the lithology listing <br />for drill hole 3-56-G13, designated G-59 in Figures 1 and 2. <br />This core, chosen as the pivotal axis for the two cross-sections, <br />provides a p oin t of reference for the subsequent appraisal <br />• of interburden, its potential water leaching properties, <br />and the effects of leaching on surface water quality. <br />Data appearing in Table I provide information for both <br />coal and interburden thickness (column 4), major stratigraphic <br />features (column 3), coal seam identity (column 6), thiclcr.ess <br />(column 7) and elevation of coal seams (columns 8 and 9). <br />Accompanying this report is a more complete lithology <br />analysis of drill core G-59, prepared by geologists'J. Bratt <br />and J. Semborslci (See Figure 3). <br />Semborsl:i and Kraus examined the lithology of this core <br />and selected gi~~en portions for leaching tests. Guidelines set <br />forth by U.S.G.S.(!) were followed in deciding the correct <br />sampling frequency and interval length of tl~e core. In actual <br />practice, the sampling frequency was adjusted to fit the <br />lithographic changes. <br />• <br />