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Ihis twlU Inlunnetiar is IIOt dtn .• tpeeific. Onsite investigation, testing and analysis by competent personnel is needed before construc• lion or other engineering use of soils. c %8`+ 56--Larkson stony ;oam, S to 20 percent slopes. This deep, .+e~i drained Soil is on fan terraces. [t formed in alluvium and col:uvium derived dominantly from sedimentary rocks. The native vegetation .s mainly ponderosa pine. Elevation is 6,400 to 6,800 feat. The average annual precipitation ~s 16 to 18 inches, the average annual air temperature is 43 to 45 degrees F, and the average frost-free period is 90 to 120 tlays. Typically, the surface is covered with a mat of ponderosa pine and oakbrush litter about "L inches thick. The surface layer is grayish brown stony loam about 3 inches thick. The subsurface layer is gravelly fine sandy Icam about 5 inches thick. The upper 17 inches of the subsoil is clay loam. The lower 15 inches is silty clay loam. The substratum to a depth of 60 inches or more is silt loam. T,he sail I• is neutral. Included in this unit is about 5 percent Tecolote very gravelly sandy loam on steep terrace edges. The Tecolote soils have a high content of gravel. Also included is about 5 percent Martinsdale sandy loam in small parks. The Martinsdale soils have a thicker, dark surface layer and a lass clayey subsoil then this Larkson soil. Also included in mapping ors soils with a darker surface layer. Permeability of this Larkson soil is slow. Available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is rapid to very rapid, and the hazard of water erosion ~s high to vary high. This unit is used for recreation, w~ldlifa habitat, and livestock grazing. A small area southeast of Howard has been cleared and ~s now (~ irrigated hayland. Broma and other grasses are grown. t, / ~C