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<br />~. [he Wyoming Basin Province, one of nine physiographic provinces <br />defined for Colorado. The Williams Fork Mountains form the uplifted <br />area between the Axial,Basin to the south and west and bhe Yampa Basin <br />to the north. The northern end of the area surveyed lies on the top <br />of the divide between the Yampa and Williams Fork Rivers, the major <br />drainages within the region. <br />The topography within the study area is dominated by a.northeast- <br />southeast running ridge, which joins the Yampa River-iilliams Fork River <br />divide in the northwestern portion of the study are. This area consists <br />of flat to rolling ridge top terrain with steep escarpments or cliffs <br />on the southern end of the ridges. Elevation ranges from 7760 feet <br />(2365 m) on the ridge top in the southwestern portion of the project <br />~ area to 7360 feet (2243 m) in the bottom of Hayden Gulch. <br />C• <br />The major drainage within the study area is Hayden Culch, a south- <br />ward flowing tributary to the East Fork of the Williams Fork River. <br />Secondary tributaries to Hayden Gulch drain the ridge top. An unnamed <br />northward flowing intermittent stream drains the extreme northwestern <br />portion of the area studied, , <br />The principal geologic formations within the study area consist <br />of the Mancos shale, a shale which intertongues with members of the. <br />Mesa Verde Group, and the Williams Fork formation, a member of the Mesa <br />Verde Croup. The Williams Fork Formation consists of sandstone, shale <br />and coal beds (Tweto 1976). <br />Hydrology <br />The East Fork of the Williams Fork River, located three miles (3428 m), <br />south of the sutey area, constitutes the primary permanent water <br />source in the region. Hayden Gulch, the principal water course wiChin.~. <br />