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74 Soil Survey producing woody shrubs at a level that decreases the water capacity is very low. The shrink-swell potential is extent of the preferred forage plants. high. The effective rooting depth is limited by the This map unit is in capability subclass Vie bedrock at a depth of 10 to 20 inches. Runoff is very (MLRA-15), nonirrigated. The uneroded and eroded rapid, and the hazard of water erosion is very severe. Honker soils are in vegetative soil group D, and the The eroded Honker soil is moderately deep and well Vallecitos soil is in vegetative soil group G. drained. It formed in material weathered from sandstone. Typically, the surface layer is light brownish 178—Honker-Vallecitos-Honker, eroded, complex, gray gravelly loam about 7 inches thick. The upper 11 50 to 75 percent slopes. These very steep soils are on inches of the subsoil is light brown gravelly clay loam. dominantly south-facing slopes on mountains. The The lower 13 inches is a claypan of light red gravelly native vegetation is mainly annual grasses, forbs, and clay. Hard sandstone bedrock is at a depth of 31 chaparral. Elevation is 800 to 3,300 feet. The average inches. In some areas the surface layer is gravelly clay annual precipitation is 12 to 18 inches, the average loam. annual air temperature is about 60 degrees F, and the Permeability is very slow in the eroded Honker soil. average frost-free period is 220 to 240 days. Available water capacity is low. The shrink-swell This unit is 35 percent Honker loam, 30 percent potential is high. The effective rooting depth is limited Vallecitos gravelly loam, and 20 percent Honker by the bedrock at a depth of 20 to 40 inches. Roots are gravelly loam, eroded. The components of this unit restricted to cracks and the faces of peds in the occur as areas so intricately intermingled that it was not claypan, which is at a depth of 8 to 16 inches. Runoff is practical to map them separately at the scale used. very rapid, and the hazard of water erosion is very Included in this unit are small areas of Honker and severe. Vallecitos soils that have slopes of more than 75 or less This unit is used for livestock grazing or wildlife than 50 percent and small areas of Gonzaga and habitat. General management considerations include Franciscan soils. All of these included soils are in the very severe hazard of erosion, the slope, the very landscape positions similar to those of the dominant low or low available water capacity, the limited depth of Honker and Vallecitos soils. Also included are small the Vallecitos soil, and dense stands of chaparral in areas of exposed bedrock in convex positions near the moderately eroded areas. The characteristic plant top of the slopes. Included areas make up about 15 community on the uneroded Honker and Vallecitos soils percent of the total acreage. is mainly soft chess, wild oat, and filaree. That on the The uneroded Honker soil is moderately deep and eroded Honker soil is mainly soft chess, red brome, and well drained. It formed in material weathered from California sagebrush. Grazing should be controlled so sandstone. Typically, the surface layer is brown loam that desirable vegetation, such as soft chess, is about 5 inches thick. The subsoil is a claypan of brown maintained and enough vegetation is left standing to and strong brown gravelly clay about 28 inches thick. protect the soils from erosion. Loss of the surface layer Hard sandstone bedrock is at a depth of 33 inches. In results in a severe decrease in productivity and in the some areas the surface layer is clay loam, gravelly clay potential of the unit to produce plants suitable for loam, or gravelly loam. grazing. The very steep topography and the resulting Permeability is very slow in the uneroded Honker runoff reduce the amount of rainfall that enters the soils. soil. Available water capacity is low. The shrink-swell The slope limits access by livestock and results in potential is high. The effective rooting depth is limited overgrazing of the less sloping areas. The very low or by the bedrock at a depth of 20 to 40 inches. Roots are low available water capacity limits the production of restricted to cracks and the faces of peds in the desirable forage plants. Fencing is difficult because of claypan, which is at a depth of 10 to 20 inches. Runoff the depth to bedrock. Brush management improves is very rapid, and the hazard of water erosion is very areas of range that are producing woody shrubs at a severe. level that decreases the extent of the preferred forage The Vallecitos soil is shallow and well drained. It plants. formed in material weathered from sandstone. Typically, This map unit is in capability subclass Vile the surface layer is pale brown gravelly loam about 4 (MLRA-15), nonirrigated. The uneroded and eroded inches thick. The subsoil is pale brown and brown Honker soils are in vegetative soil group D, and the gravelly clay loam about 16 inches thick. Hard Vallecitos soil is in vegetative soil group G. sandstone bedrock is at a depth of 20 inches. In some areas the surface layer is loam, gravelly clay loam, or 179—Itano silty clay loam, partially drained, 0 to 2 clay loam. percent slopes. This very deep, poorly drained, nearly Permeability is slow in the Vallecitos soil. Available level soil is on flood plains and deltas. It formed in