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approximately 6,350 to 6,450 feet and slopes range from nearly level to about 25 percent. <br />Nearly level alluvial valley and terraces are dominant along Dry Creek in the southern part of the <br />permit area and south of the Yampa River in the northern portion of the permit area. Gently <br />sloping to strongly sloping hillsides and benches occur in the central part of the permit area. <br />Three drainages, Stokes Gulch, Dry Creek and Sage Creek, run through the permit area. The <br />Walker irrigation ditch crosses the northern portion of the permit area. The Yampa River lies <br />about one mile north of the permit area. The fluvial geomorphology of the permit area is <br />detailed in Tab 7. <br />Strati" hy. The oldest formation that outcrops within the Hayden Gulch Terminal permit area <br />is the Lewis Shale Formation of Late Cretaceous age which conformably overlies the Mesaverde <br />Group. The Lewis Shale Formation is the only formation which outcrops in the permit area <br />(Figure 6 -3 and Exhibit 64A). The Lewis Shale consists predominately of dark -gray to bluish <br />homogeneous marine shale. <br />The Quaternary age deposits within the permit area consist of thin alluvial and colluvial deposits <br />along Dry Creek and Sage Creek south of the Yampa River (Figure 6 -3 and Exhibit 6 -1 A). <br />These deposits range in size from clays to cobble -sized stones. There are not any outcrops of <br />Miocene extrusive igneous rock or any evidence of intrusive rocks in the permit area. <br />Literature Cited. <br />Bass, W.N., B.J. Eby, and M.R. Campbell. 1955. Geology and Mineral Fuels of Parts of Routt <br />and Moffat Countes, Colorado. A Contribution to Economic Geology. U.S. Geological <br />Survey Bulletin 1027 -D, U.S Government Printing Office, Washington D.C. <br />PR -01 6 Revised 10/ 11 <br />