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! ~~ The topography and stratigraphy along with depositional characteristics <br />,. ~ <br />)'' _. <br />1- and structural geology of the general area will be discussed in this <br />section. <br />2.7.1.1 Topography <br />The crest of the Williams Fork Dtountains forms a long ridge running east <br />and west at elevations which range between 7400-7700 feet. This ridge forms <br />part of the drainage divide between the Williams Fork and Yampa Rivers. <br />The north slope of the mountains drops at approximately a 15% grade near <br />the crest, decreasing to 2% near the flood plain of the Yampa River. <br />Drainages run south to north down this slope and are dendritic in pattern. <br />Broad swales collect water in the upland areas and yield water to channels <br />~;-~ in broad valleys 50 to 100 feet deep. The mine-plan area can be character- <br />.~J''' ~. <br />^` ized as having broad flat ridgetops separated by these south to north <br />~ trending valleys. <br />On the southern slope of the Williams Fork mountains, topography is <br />markedly different than on the north slope. Outcrops of resistant sand- <br />stone form many cliff faces. Lrainage channels are bedrock controlled <br />and show a trellis-like pattern. The overall slope of the land surface <br />toward the Williams Fork River is much steeper than on the north flank. <br />Hillslopes on the south Flank may be vertical., or nearly so, where sand- <br />stone members crop out. Ridges are often capped by the resistant sand- <br />stone members. The flattest slopes are found along ridge tops and <br />drainage channels. <br />i' \ <br />t~~: <br />t'?~: <br />2-346 <br />