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LARAMIE-FOX HILLS AQUIFER <br /> <br /> The lowermost of the four Denver Basin aquifers is the Laramie-Fox Hills aquifer which <br />underlies approximately 6,700 square miles and marks the areal extent of the basin for <br />economic ground water development. The Laramie-Fox Hills aquifer is generally between 250 <br />and 300 feet thick, and includes about 150 to 200 feet of fine-grained and medium-grained <br />sandstone. The aquifer typically yields water in quantities sufficient for commercial <br />development and is extensively utilized throughout the basin. Well yields may be as high as <br />100 gpm, but are typically somewhat lower. Both the Laramie-Fox Hills and Arapahoe aquifers <br />are generally under artesian pressure at the present time. <br /> <br /> <br />PIERRE SHALE <br /> <br /> The Pierre Shale underlies the Fox Hills Formation and is composed of up to 4,500 feet <br />of clay shale with minor sandstone units. In general, there is not sufficient water in the <br />intermittent sandstones for use in more than a single-family residence or possibly for the <br />watering of livestock. This formation defines the boundary for development of ground water for <br />commercial purposes in the Denver Basin. <br />