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• sedimentary rocks. The surface layer is grayish brown, stony loam about <br />3 inches thick. The subsurface layer is gravelly fine sandy loam about <br />5 inches thick. The upper 17 inches of the subsoil is clay loam. The <br />lower 15 inches is silty clay loam. The substratum to a depth of 60+ <br />inches is silty loam. The soil is neutral. Slope is 5 to 20 percent. <br />Permeability is slow. Available water capacity is high. Runoff is rapid <br />to very rapid and the danger of erosion is high to very high. The plant <br />community is mainly ponderosa pine with an understory of Gambel's oak and <br />grasses. The unit is used for wildlife habitat, livestock grazing, and <br />recreation. <br />p 64 Louviers - Travessilla complex. This unit is found on hills, <br />ridges, hogbacks and canyon sides. It contains about 40 percent Louviers <br />soil, 35 percent Travessilla soil and a small amount of several other soil <br />types. The Louviers soil is shallow, well drained and formed in residuum <br />derived mainly from shale and siltstone. The surface layer is a light <br />• brownish gray, very channery clay loam about 3 inches thick. The <br />substratum is mainly clay about 13 inches thick over shale at a depth of <br />16 inches. Slope is 20 to 50 percent. The soil is neutral to 3 inches, <br />mildly alkaline to 6 inches and neutral below that depth. Permeability <br />is slow, available water capacity is very low, runoff is very rapid and <br />the hazard of erosion is very high. The Travessilla soil is shallow, well <br />drained, and formed in residuum derived mainly from sandstone. The <br />surface layer is a light brown, channery loam about 4 inches thick. The <br />substratum is channery loam about 10 inches thick over sandstone at a <br />depth of 14 inches. Slope is 20 to 50 percent. The soil is moderately <br />alkaline. Permeability is moderate. Available water capacity is very low. <br />Runoff is rapid and the danger of erosion is very high. The potential <br />plant community is mainly pinyon - juniper with an understory of Gambel <br />oak, mountain mahogany and grasses. Uses include noncommercial woodland, <br />livestock grazing, and wildlife habitat. <br />;~ 72 Midwav Casca.io Complex. This unit is composed of 60 percent Midway <br />. and 20 percent Cascajo soils on moderately sloping to steep ridges, knobs <br />and hills and the edges of fan terraces, deeply dissected by streams. The <br />Midway soil is a shallow, well drained soil formed from residuum derived <br />mainly from shale. Slope is 15 to 40 percent. Typically, the surface <br />2.04.9-9 <br />