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AQUIFERS IN THE COAL BASIN REGION <br /> Table 783 . 15-1 lists the bedrock units in the Coal Basin <br /> region and their ground water use based on regional data <br /> throughout the Crystal River Valley and the Glenwood Springs <br /> area (Brogden & Giles, 1976) . The alluvium is regionally <br /> used as a primary source of ground water, especially in the <br /> larger valley fill areas of the Crystal River and the Roaring <br /> Fork River. The extensive basalt flows north of the Coal <br /> Creek drainage are also used as a primary source of ground <br /> water, especially in the Missouri Heights area, north of the <br /> Colorado River. The underlying bedrock units are not <br /> extensively used as sources of ground water, and little well <br /> data on the characteristics of these units is available in <br /> the Crystal River Valley and vicinity. <br /> Within the Coal Basin affected and adjacent areas , the only <br /> geologic units potentially affected by mining are the <br /> alluvial stream deposits and the Mesaverde formation. The <br /> Wasatch formation outcrops west of the mine within the mine <br /> adjacent area but is not impacted by mining operations . <br /> 13 <br />