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<br />I <br /> <br />I <br />I <br /> <br />Section 2: Geotechnical <br /> <br />A. Geology <br /> <br />I <br />I <br />I <br /> <br />Regional Geology <br /> <br />I <br />I <br /> <br />Gould Reservoir/Dam is located about eight miles south of Craw- <br />ford, Colorado, in the Canyonland section of the Colorado Plateau <br />Physiographic Province. Deeply incised canyons (cut in rocks of pre- <br />Tertiary age) are the distinctive features of this section. The <br />Canyonland section is bounded on the west by the high plateaus, on the <br />north by Uinta Basin section, on the south by the San Juan River, and <br />on the east by the mountains of the southern Rockies. The region has <br />been epeirogenically uplifted and has had superimposed on it a number <br />of structural features that are strongly reflected in its topography. <br />These structures include various local upwarps, monoclines on the <br />flanks of some of the upwarps, and local domal uplifts produced by <br />igneous intrusions'. <br />. <br /> <br />I <br /> <br />I <br /> <br />The area at the vicinity of the damsite and the reservoir is <br />bounded on the north by the Cedar Point, on the east by the Cathedral <br />Peak, and on the southwest by the Gunnison River. The topography at <br />the damsite ranges from hilly to mountainous with V-shaped valleys. <br />Elevations range from 9,619 feet above M.S.L. (mean sea level> at <br />Cathedral Peak (approximately 4.25 miles east of the dam site) to <br />7,000 feet above M.S.L. north of the dam site. <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />The regional bedrock geology around the dam site (see Figure 4) <br /> <br /> <br />consists of Precambrian Biotitic Gneiss, schist; Cambrian Alkalic and <br /> <br /> <br />Mafic rocks; Jurrassic Morrison Formation (sandstone, shale, and <br /> <br /> <br />localized gypsum); Middle Tertiary intermediate to felsic igneous <br /> <br /> <br />rocks; Tertiary andesitic lavas and ash flows; Lower Cretaceous Dakota <br /> <br /> <br />sandstone, and Burro Canyon Formation; Cretaceous Mancos shale and <br /> <br /> <br />Quaternary alluvium (sand, silt, and gravel) exposed in the drainage <br /> <br /> <br />areas of the major rivers and streams. <br /> <br />I <br />I <br />I <br /> <br />II-4 <br />