Laserfiche WebLink
The basal portion of the Laramie Formation contains two relatively thick sandstone units <br />(the A and B sandstones) which are hydraulically isolated from the upper part of the formation. <br />These sandstone units, combined with the underlying Fox Hills Sandstone compose the <br />hydrogevlogic unit of the Laramie-Fox Hills aquifer. <br />LARAMIE-FQX HILLS AQUIFER <br />The lowermost of the four Denver Basin aquifers is the Laramie-Fox Hills aquifer which <br />underlies approximately 6,7�4 square miles and marks the areal extent of the basin for economic <br />ground water development. The Laramie-Fox Hills aquifer is generally between 250 and 300 <br />feet thick which includes about 1 SO to 200 feet of fine-grained and medium-grained sandstvne. <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 100 gpm, but are <br />typically somewhat lower. 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 4,50� 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 possib�y 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 />5 <br />