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I I I I I I I I I I I I I I I I I I I O~2S~3 Group, Detailed information is lacking on the rank of the coal and on the thickness, persistence, and lateral correlation of the coal beds, but the information available suggests the presence of large resources of high volatile C bituminous coal (3), The Rangely Oil and Gas Field is only a few miles from the dam site, Other oil and gas fields are located nearby in Moffat and Rio Blanco Counties in the Wilson Creek, Thornburg, Moffat, Douglas Creek, North Douglas Creek, Iles, Danforth Hills, Maudlin Gulch, Baxter Pass, Piceance Creek, Sulphur Creek and Divide Creek fields. Oil or gas has been produced from 12 formations rang- ing from the Weber Sandstone of Pennsylvanian and Permian Age to the Green River Formation of Tertiary Age and including rocks of Triassic, Jurassic, and Cretaceous Ages (3), The richest and thickest known oil shales in the world occur in the Green River Formation, which was deposited in Eocene time in three lakes in Utah, Wyoming, and Colorado. The richest and thickest part of these depostts underlies 1,400 square miles of area, called the Piceance Creek basin, between the Colorado River and White River. This basin is adjacent to and southeast of the dam site (3), In conjunction with the oil shale deposits, nahcolite and dawsonite are found near the confluence of Piceance Creek with the White River. Rio Blanco County lies outside the principal precious and base-metal mining districts in Colorado. There are no known precious or base-metals in or near the reservoir site although a small deposit of uranium-bearing sandstone with a small amount of vanadium exists at Skull Creek in Moffat County to the northeast, II-13