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2.04.6 (2) (a) <br />'• attains a thickness of 150 to 200 feet in the area. <br />The Lower Coal Member consists of interbedded sandstone, <br />siltstones, shales and coal. The unit averages 270 feet irr <br />' thickness and contains three recognized persistent coals in <br />its lower part: The A,B, and C seams. The Lower Coal Member <br />' is almost always capped by a massive sandstone unit which <br />varies in thickness from 20 to 225 feet. This sandstone i:> <br />' similar in nature to the Rollins but shows much more <br />variation in thickness and is more difficult to correlate. <br />' The top of this sandstone marks the bottom of the upper <br />coal member. <br />' The Upper Coal Member contains approximately 220 feet of <br />shales, siltstones, sandstones and 3 persistent coals <br />(recognized as the D, E and F seams). This member displays <br />sequences of disturbed bedding (attributed to preconsolidational) <br />slumping and bioturbation) in the non-coal units. The shale to <br />sandstone ratio increases relative to the lower coal member, <br />' and the sandstones appear to be less continuous than those in <br />the lower coal member, possibly due to a greater fluvial <br />' influence in the depositional regime of the upper member. <br /> The Barren Member consists of a thick sequence of interbedded <br />' sandstone, siltstone and s hale with a few lenticular coal reams. <br /> This unit is of non-marine origin and o` minimal economic <br />' importance. Sandstones in the barren member are the uppermost <br /> cliff-formers across the a rea, but are lenticular and of <br />' limited lateral extent in outcrop. <br />' Cross sections are shown on drawings 2.04.6(2)(a)-1, N-S cross <br />section and 2.04.6(2)(a)-2, E-FI cross section. The locations of <br />the cross sections and drill holes are shown on Map 2.04.6(2)(a)-3. <br />REVISED May 15, 1981 <br />40 <br />