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' The Larkson soil is deep and well drained . It formed in coliuv - jm <br /> derived dominantly from sandstone . Slope is 25 to 40 percent . <br /> ' Typically , the surface is covered with a mat of Gambel oak litter <br /> about 2 inches thick . The surface layer is dark grayish brown stonv <br /> loam about 4 inches thick . The subsurface layer is pale brown <br /> gravelly fine sandy loam about 4 inches thick . The upper 17 inches of <br /> the subsoil is clay loam. The lower 15 inches is silty clay loam. <br /> ' The substratum to a depth of 60 inches or more is silt loam. The so ; l <br /> is neutral . <br /> ' Permeability of the Larkson soil is slow. Available water <br /> capacity is high . Effective rooting depth is 60 inches or more. <br /> Runoff is rapid to very rapid , and the hazard of water erosion is high <br /> tto very high . <br /> This unit is used for wildlife habitat and limited livestock <br /> grazing . Access by livestock is limited by steepness of slope anG <br /> thick brush . <br /> ' The potential plant community is mainly ponderosa pine and an <br /> understory of Arizona fescuei, mountain muhly , muttongrass , Gambel oaK , <br /> mountainmahogany , and snowbelrry . The potential production of the <br /> ' native understory vegetation in normal years is about 600 pounds of <br /> air-dry vegetation per acre . <br /> ' This unit is suited to the production of ponderosa pine . The site <br /> index for ponderosa pine is ,about 40. <br /> r <br /> The Toles soil is poorly suited to homesite development . The main <br /> ' limitations are steepness of slope and shallow depth to bedrock . <br /> The Larkson soil is poor1ly suited to homesite development . The <br /> ' main limitations are steepness of slope , slow permeability , and h ! ;r. <br /> shrink-swell potential . <br /> ' This map unit is in capability subclass VIIe , nonirrigateo . It <br /> ' in the Ponderosa Pine woodland site . <br /> 3 " � <br />