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The most limiting factors for using this soil for topsoil are the high <br />content of coarse fragments in the C horizon and the shallow soil depth. <br />Coarse fragment contents range from 15 to 40 percent for the two sampled <br />pedons (Table 9-4-4). Based upon two profiles, about four inches of <br />suitable topsoil is available for salvage within Map Unit 3. <br />Map Uriit 4- Shavano Variant Sandy Loam, 2 to 15 Percent Slopes <br />This map unit is associated with the gently to moderately sloping upland <br />benches and ridgetops. Vegetation consists primarily of big sagebrush <br />and rangeland grasses. Typically, this soil overlies fractured <br />yellowish-brown sandstone at depths ranging from 8 to 15 inches. This <br />soil represents 3.0 percent of the study area (Table 9-4-3). <br />This soil has the most profile development and best topsoil in the study <br />area (Tables 9-4-2 and 9-4-5). Soil reactions are neutral and <br />carbonates have generally leached from the A and B horizons. A <br />structural cambic B horizon with a slight clay accumulation is also <br />• present. Coarse fragment content typically ranges between 0 and 20 <br />percent for the A, 6, and C horizons. Based upon six profiles (Table <br />9-4-4), about 12 inches of suitable topsoil is available for salvage <br />within Map Unit 4. <br />Mao Unit 5 - Shavano Variant Loam - 2 to 15 Percent Slopes <br />This map unit is associated with the gently to moderately sloping upland <br />benches and ridgetops. Vegetation consists primarily of big sagebrush <br />and rangeland grasses. Typically, this soil overlies soft light gray <br />sandy shale and siltstone at depths ranging from 10 to 17 inches. This <br />sail represents 3.2 percent of the study area (Table 9-4-3). <br />This soil, like Map Unit 4, also has moderate profile development and <br />fairly good topsoil reserves. The surface A and cambic B horizons have <br />a neutral reaction and are free of carbonates (Tables 9-4-2 and 9-4-5). <br />Clay contents in the B and C horizons are marginally suitable, averaging <br />42 percent. However, associated saturation percentages are highly <br />suitable (49 percent). Based upon seven profiles (Table 9-4-4), about <br />• 17 inches of suitable topsoil is available for salvage within Map Unit <br />5. <br />9-4-23 Revised 11/Ol/86 <br />