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• gulleys where the Menefee is exposed by erosion. This contribution <br />would be offset in some degree by seepages from the up-dip exposures <br />of the Menefee. <br />An appropriate sn•atigraphic reference for ground water hydro- <br />logy in the area shown oii Map A might be the top of the ]'Dint Look- <br />out, or the Menefee-Point Lookout contact surface. Most deep <br />domestic wells in the area bottom in the Point Lookout. It is about <br />150 feet thick, is of fairly uniform texture and composition, and is <br />underlain by the impervious Marcos shale. This formation would <br />seem from these characteristics to be a more uniformly saturable <br />formation, hence have a more reliable piezometric surface for <br />reference purposes. <br />• Elevation contours have been drawn on Map A to indicate the <br />depth of the Menefee-Point Lookout contact surface. From the con- <br />tours, dips of 2%-1'7°Jo to the south and southeast have been inferred <br />in the northern and western parts of the area of Map A. The blue <br />arrows are gradient vectors, indicating the direction of maximum <br />dip of the contact surface and, reasonably, the most probable <br />direction of ground water flow in or near that surface. <br />The ground water domain of interest here lies north and north- <br />west of the axis of the Durango anticline and as previously stated <br />is bounded on the north by the outcroping belt of Menefee and Point <br />Lookout strata exposed 200-400 feet above Lightner Creek. In <br />• this domain ground water flow along, or in the vicinity of the <br />-27- <br />