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about 100 feet of medium-grade oil shale and overlain by about 100 feet of <br />medium-grade oil shale. <br />The Uinta formation overlies the Parachute Creek member and is comprised of <br />sandstones and some barren marlstones and is recognized in the D.A. Shale <br />area as the caps of the highest hills. Afine-grained basalt flow rock, an <br />erosional remnant of the extensive flows that cover Battlement and Grand Ptesas <br />south of the Colorado River; occurs on Mt. Callahan in the eastern part of the <br />D.A. Shale area but covers only a few acres. <br /> <br />Ex. D - 4 <br />