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22 Soil Survey and are in areas of granitic alluvium on remnant hills. This unit makes up about 4 percent of th survey Pentz soils are shallow and are on the steeper area. It is about 25 percent Calla and simil soils, 24 shoulders of hills. percent Carbona and similar soils, 23 per nt Wisflat Areas of this unit are used mainly for livestock and similar soils, and 28 percent compon nts of minor grazing. A few areas are used for irrigated pasture. The extent. major soils are suited to the vegetation used for Calla soils are on uplifted, dissected erraces. They livestock grazing. The Redding soils are limited by a are very deep. Slope ranges from 8 to 0 percent. very low available water capacity in most areas. In a Typically, the surface layer and subs are moderately few areas of the steeper Redding soils, the hazard of fine textured. The soils are calcaneo throughout. The wafer erosion is severe. These areas should be hazard of water erosion is mod erat or severe. protected from overgrazing. Carbona soils are on uplifted, di sected terraces. The major soils are suited to irrigated pasture. They are deep or very deep. Slop ranges from 8 to 50 Limitations include depth to the very slowly permeable percent. Typically, the surface la r is moderately fine claypan, depth to the hardpan, and a very low available textured. The underlying mated is moderately fine water capacity in areas of the Redding soils. The main textured and fine textured. The oils are calcareous hazard is water erosion in the steeper areas. The soils below a depth of 25 inches. B Brock is at a depth of 40 should be tilled on the contour or across the slope. to 60 inches in some areas. a shrink-swell potential is high. The hazard of wate rosion is moderate or Rol 'ng to Very Steep Soils on Uplifted, Dissected severe. Tern es and Mountains Wisflat soils are on mo tains. They are very shallow The s 'Is in this group are in the highest positions in or shallow. Slope ranges om 30 to 75 percent. the county. hey are in areas of the Coast Range in the Typically, the surface la r and underlying material are southwestern rt of the county. Elevation ranges from moderately coarse text r d. Sandstone bedrock is at a about 150 feet t 300 feet. The average annual depth of 8 to 20 inche . The hazard of water erosion is precipitation is 9 to 8 inches, and the average annual severe or very sever . air temperature is 60 green F. The average frost-free Minor in this unit r the Alo, San Timoteo, and period is 200 to 270 day Vaquero soils, Xero I vents, and Xerorthents. Alo, San These soils are well drai . The soils on uplifted, Timoteo, and Vaq o soils are in the sante landscape dissected terraces are deep or ry deep. The soils on position as the Wi at soils" Alo and Vaquero soils are mountains are very shallow to mo rately deep over moderately deep d are characterized by the formation hard bedrock. The surface layer is m derately coarse of wide cracks thI open and close seasonally. San textured, moderately fine textured, me ' m textured, or Timoteo soils ar moderately deep and somewhat gravelly and medium textured. Most of th soils have a excessively drai ed" Xerofluvents and Xerorthents are fine textured subsoil and a high shrink-swe otential. somewhat exc sively drained, are occasionally These soils are used mainly for livestock g zing or flooded, and a in the lowest positions in arroyos and for wildlife habitat. intermittent c annels. Two map units are in-this group. They make up Areas of is unit are used mainly for livestock about 7 percent of the survey area. grazing or ildlife habitat. The major soils are suited to the vegeta on used for livestock grazing. The Wisflat 19. alfa-Carbona-Wisflat soils are I" ited by a very low available water capacity. i Because f the moderate to very severe hazard of Well drain moderately coarse textured and moderately water er sion, the unit should be protected from fine textured s that are very shallow, shallow, deep, overgr ing. a' and very deep; o lifted, dissected terraces and mountains 20. onzaga-Honker-Vallecitos This map unit is in an ea where tectonic uplift of terraces and the subsequen rosion and dissection Wel drained, medium textured and gravelly medium have resulted in a landscape th consists mainly of hill to ured soils that are shallow and moderately deep; on- slopes. It is in areas of the Coast ge in the mountains southwestern part of the county. Deep cut, narrow- This map unit is on mountains in an area where valleys extend through this unit and into t San tectonic uplift and the subsequent erosion and Joaquin Valley. dissection have resulted in a very rugged landscape. It