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<br />~ <br />--J <br />c..c <br />o <br /> <br />The Belden is important because, where it is present, it overlies the Leadville and may act <br />as a confIning layer or a semi-conf"ming layer (5). For the most part, the Belden is not a <br />source of water, but it can store and potentially release water slowly. It is a fine-grained unit <br />composed mostly of shale but contains interbeds of limestone. The Evaporite is not present <br />in the immediate vicinity of the Pool but can be found southeast and southwest of the area. <br />It is composed mostly of evaporites (salts) and probably is the source of minerals in the water <br />that is discharged by the Yampa Spring and other springs in the area. <br /> <br />Structural Setting <br /> <br />The Glenwood Springs area has been uplifted and folded extensively, and as a result, the <br />bedrock units have been faulted and fractured (Figures 4 and 5). These faults displace the <br />units relative to each other and provide avenues and conduits for the movement of ground <br />water between different units. Principle faults in the area include the West Glenwood Thrust <br />Fault, the Redstone Fault, and the Wright Fault. Both the Redstone and the Wright Faults <br />are normal faults; together with the West Glenwood Thrust Fault they bound the Pool area <br />and provided movement that contributed to the hydrologic interconnectlon of the underlying <br />and overlying geologic units. Figures 4, 5 and 6 are geologic cross-sections depicting the <br />orientation of the bedrock formations with the mapped faults. Locations of these cross- <br />sections can be found on Figure 2. There are several normal faults in the area that have been <br />mapped, but not named (Figure 2). Further, because of the extensive structural activity, <br />there probably are numerous, smaller normal. and thrust faults in the area that have not been <br />mapped, but are present and affect the movement of ground water. <br /> <br />The Wright Fault is an important component of the source of water to the Pool because it is <br />a likely avenue for ground water to move from the Leadville to the land surface where it is <br />discharged through the Yampa Spring (Figures 6 and 6). Numerous other springs are aligned <br />with or near the Wright Fault; many of these springs can be seen in the bed of the Colorado <br />River and along the banks of the river. The Wright fault and other faults can provide a travel <br />route for ground water to discharge into the Colorado River or onto the land surface.as <br />springs, depending on the elevation of the water levels in the systems. <br /> <br />- 7- <br /> <br />I Bishop-Brogden Associates, Inc. <br />