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11 <br />to 70 percent and are primarily deep to very deep, well drained, and have <br />moderate to high available water capacities. Soil textures are highly variable <br />ranging from loams to very stony clays for surface soils and from loams to very <br />cobbly clays for subsurface soil horizons. Coarse fragment percentages increase <br />with depth. The mass movement potential is rated as moderate to high for most <br />of these map units, though low ratings are common for lesser slope angles. <br />Soils of canyon, mesa, ridge, mountain, and valley side slopes are highly variable <br />given the broad topographic range of this grouping. Parent materials include <br />interbedded sandstones, shales and mixed igneous rock types. Slopes range <br />from 5 to 90 percent. These soils are shallow to very deep, well drained, and <br />typically exhibit low to medium available water capacities. Surface textures range <br />from clay loams to extremely stony loams while subsurface textures range from <br />stoney sandy loams to very cobbly clays. The mass movement potential is low to <br />high given the broad slope range. <br />Deep to very deep, well drained soils with low and moderate available water <br />capacities typify mesa summits, ridges, benches and side slopes of the project <br />area. Interbedded limestones, shales, and basalts are the dominant parent <br />materials underlying slopes ranging primarily from 15 to 65 percent. Surface soil <br />textures range from sandy loams to gravelly loams while subsoil textures range <br />from sandy loams to very stoney clays and extremely cobbly sand loams. The <br />mass movement potential ranges from low to high depending, in part, on slope <br />percentage. <br />Soils of mountain slopes and benches are forming in residuum and colluvium <br />derived from sandstones, shales, and basalts. Igneous parent materials may <br />also be present in some cases. Slopes range from 5 to 65 percent. These soils <br />are deep to very deep, well drained, and exhibit medium available water <br />capacities. Surface textures are typically loams and clay loams while subsurface <br />textures range from loams to very stony clays. The mass movement potential is <br />typically low to medium. <br />Shallow to deep, well drained soils with low to high available water capacities <br />typify the uplands and associated mountain side slopes of the project area. <br />Sandstones, shales, and mixed alluvium are the dominant parent materials on <br />slopes ranging from 5 to 25 percent. Surface soil textures are loams and clay <br />loams while subsoil textures range from clay loams to channery loams. The <br />mass movement potential was not rated for these soils. <br />Soils overlying uplands, valley side slopes and alluvial valleys are forming in <br />sandstone materials, eolian deposits, and mixed alluvium. Slopes range from 6 <br />to 65 percent. These soils are typically deep and well drained with high available <br />water capacities. Surface textures are loams while subsurface textures range <br />form channery clay loams to clays. The mass movement potential was not rated <br />for the soil portions of these map units <br />