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43 <br />• Tracts 8, 13, and 14 <br />Environment <br />These three tracts are discussed in a fashion similar to Tracts 1, <br />3, 4, and 6, since they also share contiguous boundaries or are located <br />extremely close to one another (Fig. 5). Tracts 8 and 13 share a common <br />boundary while Tract 14 is located directly east of Tract 13, across <br />the Williams Fork River. Environmentally, there is no significant dif- <br />ference among the three tracts, although Tract 14 has somewhat more mois- <br />ture available and supports a lusher vegetative growth in some places. <br />Tracts 8 and 13 lie entirely on Iles Fountain, a block of sedimentary <br />deposits which dips to the north and has an. east-west strike. The southern <br />end of the block forms an escarpment and a part of the north rim of the <br />• Axial Basin. The tracts are bounded on the east by the Williams Fork <br />River and on the west by Milk Creek. Both flow north into the Yampa <br />River. The southern boundary of Tract 8 is slightly north of the drain- <br />age divide; consequently, the major drainages within the tract flow north- <br />ward. <br />Iles Mountain is similar to the mountain masses on which the more <br />easterly tracts lie. The mountain has a long, <br />running into the Yampa River Valley, and steep <br />eastern portion, in which Tract 13 is located, <br />formed in part by an entrenched meander of the <br />and by the Williams Fork River valley on the e <br />gentle north-facing slope <br />south-facing slopes. The <br />is a high narrow ridge <br />Yampa River on the west side <br />3s t. <br />Tract 13 is quite rugged, with steep grassy slopes on the east side <br />and extensive sandstone outcroppings on the west. Tract 8, in contrast <br />• to the above, is almost entirely situated on the gentle north slope, <br />