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The basal portion of the Laramie Formation contains two relative�y thick sandstone units <br />(the A and B sandstones) which are hydrauiically isoiated from the upper part of the formation. <br />These sandstone units, combined with the underlying Fox Hills Sandstone compose the <br />hydrogeologic unit of the Laramie-Fox Hills aquifer. <br />LARAMIE-FUX HILLS AQUIFER <br />The lowermost of the four Denver Basin aquifers is the Laramie-Fox H�lls aquifer which <br />underlies approximately 6,700 square miles and marks the areal extent of the basin for economic <br />ground water de�elopment. The Laramie-Fox Hills aquifer is generally between 250 and 304 <br />feet thick, which includes about I50 to 200 feet of fine-gra.ined and medium-grained sandstone. <br />The aquifer typically yields water in quantities sufficient for commercial development, and is <br />extensively utilized throughout the basin. Well yields may be as high as 104 gpm, but are <br />typically somewhat lvwer. Both the Laramie-Fox Hills and .Arapahoe aquifers are generally <br />under artesian pressure at the present time. <br />PIERRE SHALE <br />The Pierre Shale underlies the Fox Hills Formation and is composed of up to 4,50D feet <br />of clay shale with minor sandstone units. In general, there is not sufficient water in the <br />internutten� sandstones for use in more than a single-family residence or possibly for the <br />watering of livestock. This formation defines the houndary for de�elopment of ground water for <br />commerciai purposes in the Denver Basin. <br />3 <br />