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<br />1 <br />t <br /> 2.04.6(2)(a) <br /> <br /> minor "roll" in that area which plunges to the northeast. <br />' The orientation of this " roll" is believed to be the cause <br /> of the anomalous F seam d ip of 7.4 degrees to the north-west <br /> in the area of the adit. Some of the minor anomalies shown <br /> on the structure maps may be th e result of correlation problems <br />t in areas where the seams thin, split and/or change interval <br /> thickness with nearby sea ms. <br />' The coal measures of interest lie within the Upper Cretaceous <br /> Mesaverde . Group The name "fesaverde" is somewhat misleading <br /> in that the section in the Alorth Fork Valley area is not <br /> correlative with the type area for the Mesaverde Group in <br />t the San Jua n Basin to the south. In this report the term <br /> Mesaverde Group shall imply the Mesaverde Group of the <br />' southern Pi ceance Basin. A generalized stratigraphic column <br /> is shown in Figure 2.04.6( 2)(a)-1 on the following page. <br />' The Mancos Shale is the oldest formation exposed in the Paonia <br />area, consisting of a sequence of dark gray to buff marine <br />' shale, 2,000 to 3,000 feet thick. Only the upper part of this <br />formation is exposed in the area. <br />' Conformably overlying the P4ancos Shale is the r^.esaverde <br />' Group which has been subdivided into four stratigraphic <br />units: The basal Rollins Sandstone, the rower Coal Member <br />(Bowie Shale - Lee, 1912), the Upper Coal Member (Paonia <br />Shale - Lee, 1912) and the Barren Member. <br />The Rollins Sandstone is white to buff., Drell sorted, fine to <br />medium grained and massive. It is a conspicuous cliff former <br />' which is generally easily recognizable in cores. The Rollins <br /> <br />' 39 <br />