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in an area that consists of south trending ridges flanked by <br />the deeply-cut and steep stream drainages of Oasis and No <br />Name Creeks which drain to the south directly into the <br />Colorado River. <br />Cascade Creek, as well as the other small unnamed <br />creeks in the immediate area of concern, are intermittent <br />throughout their length and yield insufficient water on a <br />regular basis to support subirrigation or flood irrigation <br />agricultural activities in the areas of the proposed quarry <br />sites. No alluvial valley floors, therefore, occur on or <br />adjacent to the quarry sites. <br />Elevations in the area of concern vary from about <br />6200 feet at the old Holly Sugar quarry where alternative 9 <br />is located to about 8700 feet at the alternative 3 site. <br />The general land form of the area is characterized <br />by steep slopes and canyons that make access difficult. <br />Principal geologic formations present in the area are: <br />Approximate <br />System Series Character Thickness <br />Pennsylvanian Belden-Molas Shale with 800 feet <br />some limestone <br />Mississippian Leadville <br /> Upper Half Limestone 100 feet <br /> Lower Half Dolomite 100 feet <br />Devonian Chaffee Dolomite 160 feet <br />Ordovician Manitou Dolomite 110 feet <br />Cambrian Sawatch, et al nuartz & Dolomite 630 feet <br />Pre-Cambrian (Basement Rock) Granite & Gneiss <br />Within the area of the proposed quarry sites, the <br />geologic formations strike east-west with dips of 18 to 20 <br />degrees to the south in the northernmost area and 30 to 40 <br />