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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 valleys and terraces are dominant along Dry Creek in the southern <br />part of the permit area and south of the Yampa River in the northern portion of the permit <br />area. Gently sloping to strongly sloping hillsides and benches occur in the central pert <br />of the permit area. <br />Two drainages, Stokes Gulch and Dry Creek, run through the permit area. The Walker <br />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 Teb 7. <br />Stretigraohv. The oldest formation that outcrops within the Hayden Gulch Terminal permit <br />area is the Lewis Shale Formation which conformably overlies the Mesaverde Group. The <br />Lewis Shale Formation of Late Cretaceous age is the only formation which outcrops in the <br />permit area (Figure 6-3). The Lewis Shale consists dominantly of dark-grey to bluish, <br />homogenous marine shale. <br />The Oueternary age deposits within the permit area consists of thin alluvial and coLluvial • <br />deposits along Dry Creek and south of the Yampa River (Figure b-3). These deposits range <br />in size from clays to Cobble-size stones. there are not any outcrops of Miocene extrusive <br />igneous rock nor any evidence of intrusive rocks in the permit area. <br />Literature Cited <br />Bess, 4. N., B.J. Eby, and M.R. Campbell. 1955. Geology end Mineral Fuels of Parts of <br />Routt and Moffat Counties, Colorado. ~ Contribution to Economic Ceolocv. U.S. <br />Geological Survey Bulletin 7027-D, U.S. Government Printing Office, Washington, D.L. <br /> <br />6 <br />