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• ; <br />~1 <br />~j <br />The Upper trilliams Fork overlies [he Twentymile Sandstone member and <br />is composed primarily of complex interbedded sandstone, siltstone, sandy <br />shale, and shale stata with some coal seams. These strata were <br />deposited in a deltaic environment. The unit thickens from east [o <br />west. The thickness reaches about 850 fee[ in the vicinity of the <br />Trapper Mine. <br />-zo- <br />