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~." Various areas surveyed are covered with a desert pavement of rounded <br />pebbles and cobbles which have been redeposited either from topographi- <br />cally higher parts of a quaternary formation or redistributed during <br />quaternary shifting of the Yampa River. Such capped areas are evident <br />on the northwest side of the Silliams Fork Mountains, situated within the <br />Yampa River syncline. At times these "river bottom" gravel caps appear well <br />above the present level of the Yampa River. It appears the synclinal system <br />responsible for the topographic and geological condition of the survey area, <br />begins with an anticlinal crest located immediately south of the Williams Fork <br />`fountains. A series of localized block faulting creates the southwesternly <br />drainage system evidenced by deep canyons such as Ute Gulch, Horse Gulch and <br />Castor Gulch, which empty precipitously into the Williams Fork River. In <br />constrast, the northern side of the Williams Fork Mountains are characterized <br />by rolling hills, and primary drainage patterns, such as the Johnson and Pyeatt <br />Gulches with their associated networks of intermittent arroyos. This condi- <br />tion is brought about by subsidence of the floor of the Yampa Valley <br />syncline. <br />• <br /> <br />FENCELINE BETWEEN SECTIONS 5 AND 6 <br />LOOKING SOUTN, DOWN INTO A SMALL <br />SECLUDED VALLEY. DRAINAGE IN PHOTO <br />RUNS INTO THE WILLIAMS FORK. NOTE <br />THE WILLIAMS FORK MOUNTAINS IN THE <br />BACKGROUND. <br />8 <br />