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<br /> <br />2/83 <br />74--Torriorthents-Rock outcrop complex, cool, 35 to 90 percent <br />slopes. This map unit is on steep, mainly south-facing slopes of <br />mountains, hills, ridges, and canyonsides in extremely rough and eroded <br />areas. The native vegetation is mainly sparse shrubs and grass with some <br />pinyon and juniper trees. Elevation is 6,200 to 8,500 feet. The average <br />annual precipitation is 16 to 20 inches, the average annual air temperature <br />is 42 to 44 degrees F, and the average frost-free period is 85 to 100 days. <br />This unit is 50 percent Torriorthents and 40 percent Kock outcrop. The <br />components of [his unit are so intricately intermingled that it was not <br />practical to map them separately at the scale used. <br />Included in this unit is about 5 percent Castner loam and Peso loam. <br />Torriorthents commonly are very shallow to hard or soft bedrock, but <br />some small areas are moderately deep. These soils are well drained to <br />somewhat excessively drained. They formed in residuum and colluvium derived <br />from sandstone, shale, limestone, or siltstone. No single profile is <br />typical of Torriorthents, but one commonly observed in the survey area has a <br />surface layer of pale brown channery loam 3 inches thick. The underlying <br />material is very channery loam 10 inches thick. Sandstone is at a depth of <br />13 inches. T.n some areas the surface layer is stony or flaggy. Depth to <br />shale or sandstone ranges from 8 to 16 inches. The soils are calcareous <br />throughout. <br />Permeability of the Torriorthents is moderate to moderately rapid. <br />Available wafer capacity is low. Effective rooting depth is mainly 8 to 16 <br />inches. Runoff is ver}• rapid, and the ha2ard of water erosion is very <br />high. <br />