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72-Midway-Cascajo complex, 70 to 40 percent <br />slopes. These soils are on moderately sloping to steep <br />ridges, knobs, hills, and edges of fan terraces that are <br />deeply dissected by streams. The native vegetation is <br />mainly grasses, cactus, and scattered pinyon and <br />juniper. Elevation is 5,300 to 6,500 feet. The average <br />annual precipitation is 12 to 15 inches, the average <br />annual air temperature is 50 to 53 degrees F, and the <br />average frost-free period is 150 to 165 days. <br />This unit is about 60 percent Midway soil and 20 <br />percent Cascajo soil. The Midway soil is mainly on the <br />steeper side slopes. The Cascajo soil is mainly on <br />knobs and hills and along the crests of terrace edges. <br />Included with these soils in mapping are areas of Kim <br />soils on terraces, tops of hills, and foot slopes. Kim <br />soils have a surface layer of loam. They make up about <br />10 percent of the unit. Also included are small areas of <br />shale outcrop on the steeper side slopes and some <br />areas, making up about 10 percent of the unit, of soils <br />that are similar to the Cascajo soil but are shallow or <br />moderately deep to shale bedrock. <br />The Midway soil is shallow and well drained. It <br />formed in residuum derived dominantly from shale. <br />Slopes range from 15 to 40 percent. The surface layer <br />is typically grayish brown very gravelly clay loam about <br />3 inches thick. The upper 4 inches of the underlying <br />material is clay. The lower part to a depth of 15 inches <br />is extremely shalt' clay. Weathered shale is at a depth <br />of about 15 inches. The soil is mildly alkaline to a depth <br />of 7 inches and is moderately alkaline below that depth. <br />Permeability is slow in the Midway soil. Available <br />water capacity is very low. Effective rooting depth is 10 <br />to 20 inches. Runoff is rapid, and the hazard of water <br />erosion is high. <br />The Cascajo soil is deep and excessively drained. 1t <br />formed in gravelly and sandy alluvium, Slopes range <br />from 10 to 40 percent. The surface layer is typically <br />very dark grayish brown very gravelly sandy loam about <br />6 inches thick. The upper 15 inches of the underlying <br />material is extremely cobbly sandy loam. The lower part <br />to a depth of 60 inches or more is extremely cobbly <br />sand. The soil is moderately alkaline. A high content of <br />accumulated calcium carbonate is between depths of 6 <br />and 21 inches. <br />Permeability is moderately rapid or rapid in the <br />Cascajo soil. Available water capacity is low. Effective <br />rooting depth is 60 inches or more. Runoff is medium to <br />very high, and the hazard of water erosion is moderate <br />to very high. <br />This unit is used as rangeland. <br />The potential plant community is mainly sideoats <br />grama, blue grama, needleandthread, Indian ricegrass, <br />and little bluestem: The average annual production of <br />air-dry vegetation is about 800 pounds per acre. If the <br />condition of the range deteriorates, red threeawn and <br />annual fortis increase. <br />This unit is poorly suited to homesite development. <br />The main limitations are the depth to shale bedrock anc <br />the slope. <br />The capability classification is Vtle, nonirrigated. The <br />unit is in the Gravel Breaks #64 range site. <br />