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<br />99-Sawfork very cobbly loam, 8 to 40 percent
<br />slopes. This deep, well drained soil is on side slopes of
<br />dissected fan terraces. It formed in colluvium and
<br />residuum derived dominantly from tuff and ash flow.
<br />The native vegetation is mainly grasses. Elevation is
<br />8,900 to 9,500 feet. The average annual precipitation is
<br />14 to 16 inches, the average annual air temperature is
<br />40 to 44 degrees F, and the average frost-free period is
<br />50 to 80 days.
<br />The surface layer is typically grayish brown very
<br />cobbly loam about 8 inches thick. The subsoil is about 6
<br />inches of very cobbly clay loam over 8 inches of sandy
<br />clay loam. The upper 17 inches of the substratum is
<br />loam. The next part, to a depth of 48 inches, is sandy
<br />loam. The underlying material to a depth of 60 inches or
<br />more is highly compacted and somewhat cemented ash
<br />flow tuff. It can be broken into loamy textured material
<br />with some difficulty. The soil is neutral to a depth of 14
<br />inches. It is mildly alkaline to a depth of 22 inches and
<br />is moderately alkaline below that depth.
<br />Included in mapping are areas of soils that are
<br />similar to the Sawfork soil but are shallow or moderately
<br />deep to tuff. These soils make up about 5 percent of
<br />the unit. Also included are areas of rock outcrop. These
<br />real make up about 5 percent of the unit.
<br />Permeability is moderate in the Sawfork soil.
<br />Available water capacity also is moderate. Effective
<br />rooting depth is 40 to more than 60 inches. Runoff is
<br />rapid, and the hazard of water erosion is high or very
<br />high.
<br />This soil is used as rangeland.
<br />The potential plant community is mainly mountain
<br />muhly, Arizona fescue, blue grama, and
<br />needleandthread. The average annual production of air-
<br />dry vegetation is about 800 pounds per acre. If the
<br />condition of the range deteriorates, blue grama,
<br />slimstem muhly, fringed sagebrush, and rabbitbrush
<br />increase. Grazing management should include
<br />measures that protect the soil from excessive erosion.
<br />Range seeding is suitable if the range is in poor
<br />condition. Mechanical treatment may not be practical
<br />because of the slope and cobbles on the surface.
<br />If this soil is used for homesite development, the
<br />main limitation is the slope. The soil is poorly suited to
<br />this use in areas where the slope is more than about 15
<br />percent.
<br />The capability classification is Vle, nonirrigated. The
<br />soil is in the Dry Loamy Slopes #227 range site.
<br />100-Sedillo cobbly sandy loam, 4 to 25 percent
<br />slopes. This deep, well drained soil is on fan terraces.
<br />It formed in calcareous, gravelly and cobbly alluvium. In
<br />several areas it formed in landslide deposits. The native
<br />vegetation is mainly grasses and scattered pinyon and
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<br />Soil Survey
<br />juniper. Elevation is 5,700 to 6,800 feet. The average
<br />annual precipitation is 13 to 15 inches, the average
<br />annual air temperature is 48 to 50 degrees F, and the
<br />average frost-free period is 130 to 160 days.
<br />Typically, 20 to 50 percent of the surface is covered
<br />with pebbles, cobbles, and stones. The surface layer is
<br />brown cobbly sandy loam about 5 inches thick. The
<br />subsoil is very gravelly sandy clay loam about 4 inches
<br />thick. The underlying material to a depth of 60 inches or
<br />more is very gravelly sandy loam. The soil is mildly
<br />alkaline to a depth of 9 inches and is moderately
<br />alkaline below that depth. In some areas on landslide
<br />deposits, the surface is bouldery.
<br />Included with this soil in mapping are areas of Rizozo
<br />soils on ridges and Neville. soils. on landslide deposits.
<br />Rizozo soils are shallow. They have a surface layer of
<br />channery loam. They make up about 10 percent of the
<br />unit. Neville soils have a surface layer of fine sandy
<br />loam and do not have a subsoil. They have a reddish
<br />hue. They make up about 5 percent of the unit.
<br />Permeability is moderate in the Sedillo soil. Available
<br />water capacity is low. Effective rooting depth is 60
<br />inches or more. Runoff is rapid, and the hazard of water
<br />erosion is slight to very high.
<br />This soil is used as rangeland, for wildlife habitat, or
<br />as noncommercial woodland.
<br />The potential plant community is mainly scattered
<br />pinyon and juniper and an understory of
<br />needleandthread, blue grama, Scribner needlegrass,
<br />sideoats grama, and western wheatgrass. The average
<br />annual production of air-dry vegetation is about 850
<br />pounds per acre. If the condition of the range
<br />deteriorates, red threeawn, blue grama, pricklypear,
<br />broom snakeweed, and other fortis and shrubs
<br />increase.
<br />Woodland products, such as firewood, fence posts,
<br />Christmas trees, and pinyon nuts, are produced in
<br />areas of this soil. The slope limits harvesting in a few
<br />areas. Thinning the overstory generally enhances
<br />reproduction and promotes the growth of grass and
<br />younger trees. After pinyon and juniper are thinned or
<br />harvested, seeding grasses reduces the hazard of
<br />erosion.
<br />This soil is suited to homesite development in areas
<br />where slopes are about 15 percent or less.
<br />The capability classification is Vls, nonirrigated. The
<br />soil is in the Gravelly Foothill #214 range site.
<br />101-Sedillo very gravelly loam, 1 to 5 percent
<br />slopes. This deep, well drained soil is on remnants of
<br />fan terraces that have been isolated by geological
<br />erosion into small mesas. It formed in alluvium derived
<br />dominantly from metamorphic and igneous rock.
<br />Individual areas are narrow and range from 5 to 20
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