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erosion. All adapted pasture plants can be grown, but bunch-type species planted alone <br /> generally are not suitable because of the hazard of erosion. Seedbed preparation <br /> should be on the contour or across the slope where practical. Proper grazing practices, <br /> week control, and fertilizer are needed to ensure maximum quality of forage. The <br /> suitability of this unit for homesite development depends on the depth to bedrock and <br /> steepness of slope at a specific site. The shallow Penrose soils often occur under <br /> scattered pinon and juniper on breaks and ridges. The Penrose soils are poorly suited <br /> for use as homesites with basements and for use as conventional septic tank absorption <br /> fields because of the shallow depth to bedrock. In many areas the upper part of the <br /> bedrock can be excavated with a light backhoe. In these areas the Penrose soil is <br /> suitable for homes without basements. Depth to bedrock is a moderately limiting <br /> feature for use of areas of Minnequa soil for homesites with basements. All areas of <br /> this unit except small areas of deep soil in drainageways are unsuited for use as septic <br /> tank absorption fields. The fractures of the interbedded limestone and shale under <br /> these soils conduct unfiltered effluent down toward ground water and downslope. This <br /> can result in contamination of ground water and lower areas. Areas of this unit where <br /> slope is greater than about 15 percent are poorly suited to homesite development. This <br /> map unit is in capability subclasses IVe, irrigated, and Vie, non-irrigated. It is 50 percent <br /> Limestone Breaks#58 range site and 50 percent Loamy Plains#6 range site. <br /> 84-Penrose Rock outcrop complex, 25 to 40 percent slopes. This map unit is on steep to very <br /> steep ridges, hogbacks, breaks, and canyon sides. The native vegetation is mainly pinon and <br /> juniper. Elevation is 5,100 to 6,000 feet. The average annual precipitation is 11 to 14 inches, <br /> the average annual air temperature is 50 to 53 degrees F, and the average frost-free period is <br /> 145 days to 165 days. This unit is about 60 percent Penrose soils and about 30 percent rock <br /> outcrop. The components of this unit are so intricately intermingled in most areas that it was <br /> not practical to map them separately at the scale used. Extremely steep to vertical areas are <br /> mainly rock outcrop, and Penrose soils are mainly on slopes of 40 percent or less. Included in <br /> this unit is about 5 percent Minnequa silt loam on side slopes, swales, and on foot slopes. The <br /> Minnequa soil is moderately deep. Also included is about 5 percent Shingles loam on ridges <br /> and breaks. Shingle soils have soft bedrock but lack hard bedrock within a depth of 20 inches. <br /> In a few areas moderately deep, clayey Gaynor silty clay loam is included on lower swales and <br /> low slopes. The Penrose soil is shallow and well drained. It formed in residuum derived <br /> dominantly from limestone. Slope is 25 to 40 percent. Typically, the surface layer is light <br /> brownish gray channery loam about 4 inches thick. The substratum is channery loam about 11 <br /> inches thick over hard limestone bedrock at a depth of 15 inches. The soil is moderately <br /> alkaline. Permeability of the Penrose soil is moderate. Available water capacity is very low. <br /> Effective rooting depth is 10 to 20 inches. Runoff is very rapid, and the hazard of water erosion <br /> is very high. Rock outcrop consists of interbedded limestone and shale. It is mainly in the form <br /> of ledges and cliffs 1 to 30 feet high. Only the top surface of the bedrock strata is exposed, <br />