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i <br />i <br /> <br /> <br />• Page ~ <br /> <br />The landscape is gently sloping to steep lower mountain slopes with <br />intervening canyons ,. mesas, and outwash fans. Vegetative cover includes <br />grass, ponderosa pine, serviceberry, oakbrush, aspen, and sagebrush. <br />About 60 percent of this .unit hasdark-colored surface layers to_a depth <br />of 8 to 24 inches. Organic matter content is high. Surface layers and . <br />subsoils are usually medium to fine textured. Depth to underlying parent <br />material, mainly-shale and sandstone, is 20 to 60 inches. T'ne~soils are <br />noncalcareous to depths of 10 to 30 inches. About 20 percent of the unit <br />is less than 20 inches deep over shale and sandsone. Surface layer - <br />thickness ranges from 4 to 10 inches. Textures vary according to parent <br />matt-rial: Ariother;l5 percent has dark-colored surface layers witf~ a gray; <br />subsurface layer ranging from 2 to 12 inches in thic}:Hess. Depth to = <br />underlying material is 20 to 60 inches. These soils are neutral to ' _ <br />slightly acid. Ponderosa pine or oa}:l>ru=_h are usually dominant to tl:~~se <br />soils. The remaining 5 percent of the unit consists of mixed all~avial'~ <br />There are several small delineations of this uttit which is mostly within <br />national forests. They ar.e in the southeast part of the basin except for <br />one that follc,os the divide from near Spruce Mountain to the upper reaches <br />of Horsefly Creek. This unit comprises only about 4.5 percent of the <br />basin but has a high water yield. <br />The landscape~is a stronyly sloping to steep mountainous terrain ~. <br />dissected by nw-nerous perennial mountain streams. A dense cover of <br />spruca-fir (r_onifer), mainly Engelmann spruce ,, is dominant. <br />;~;ost of this unit Yeas acid forest soils With a surface litter of needlas <br />and t~,aigs. About 58 percent of the soils h_ave_a dark-colored surface <br />layer less than 4 inches thick. Below this is a light-colored, gray,. _ <br />subsurface layer ranging from 6 to 30 inches thick that is moderately <br />ccarse to coarse textured. The underlying subsoil has blocky structure. _ <br />Textures range from moderately fine to coarse. Sore are Gravelly or <br />stony. Depth to underlying parent material is usually more than 30 <br />inches.. Another 20 percent of the unit is similar to the previous <br />description except that the surface layers are dark-colored to depths of <br />B to 20 inches. The gray subsurface layer is 4 to 20 inches thick. <br />?.bout 20 percent of the unit has soils with bedrock at depths of 20 <br />inches or less. The surface layer is dark-colored and about 7 inches <br />;.hick. The grry subsurface layer is usually absent, T}~e re.nai.ning 2 per- <br />cent is composr-d of poorly drained alluvial soils along the d.rainage'.rays, <br />soils,~some of which are poorly drained, ~ <br />1 <br />Soil N,ap in Unit 6: L;_ght=cocolored soils of the cold :nountain s1o;~_s' <br /> <br /> <br />:, <br />i <br />a <br /> <br />