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002169 Tests have been conducted to determine the best method both to mine surface deposits of oil shale and to remove the shale oil in situ. Although evaluations of both methods are being made, neither has been endorsed as being clearly superior.26 Both oil shale and c.oal o(.{.ur in tIn:; GI.~ea River FOl.lIlal.i..uu, Lul they are widely separated. If oil shale development ever becomes a reality, the wide stratigraphic separation between the Green River Formation oil shale and the Mesaverde Group coal would minimize any conflict in mining of the two energy sources (see fig. 2). If minable coal occurs at the surface, oil shale is absent; and if oil shale crops ~---_._-_._------_._--_._-_._- out, coal is too deep to be economically viable at present. Tuff(Volcanic Ash) "The Browns Park Formation contains a great quantity of vitric rhyolitic tuff that seems to have considerable industrial potential. Most of the more suitable appearing grades of tuff or volcanic ash in the Browns Park Formation are found in deposits along the central (axial) to southern part of the valley of Browns Park."27 Hansen found several promising deposlts of clean, uncontaminated vitric tuff; two deposits in sec 31, T 2 N, R 25 E,' and one that extends from the north bank of the Green River northeastward in SE~ sec 2 to the NE~ see 11, TIN, R 25 E, Daggett County, Utah. A 280-ft (85-m) stratigraphic section of the latter contained about 50 percent tuff and nearly 75 ft (23 m) of sandy tuff. 26Bureau of Land Management. Northwest Colorado Coal. Draft Environmental Impact Statement, v. I, Regional Analysis, 1976, p. '1-48. '27nansen, W. R. Geology of the Flaming Gorge Area Utah-Colorado-Wyoming. U.S. Ceol. Survey Prof. Paper 490, 1965, p. 186 and plate 3. 16, ,-