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91 -Torriorthents-Rock outcrop complex, 15-90% slopes <br />This map unit is in extremely rough and eroded areas on mountains, hills, ridges, and canyon <br />sides. Slopes mainly face south. The native vegetation is mainly sparse shrubs and grasses with <br />some pinyon and juniper trees. Elevation is 5,100 to 7,500 feet. The average annual precipitation <br />is 8 to 18 inches, the average annual air temperature is 40 to 50 degrees F., and the average frost- <br />free period is 70 to 130 days. <br />This unit is 50 percent Torriorthents that have slopes of 15 to 65 percent and 30 percent Rock <br />outcrop that has slopes of 35 to 90 percent. Included in this unit are small areas of Barcus <br />channery loamy sand, Glendive fine sandy loam, Harve loam, Moyerson stony clay loam, Nihill <br />channery sandy loam, Patent loam, Redcreek sandy loam, Rentsac channery loam, Sinkson <br />gravelly sandy loam, and Blazon, Castner, and Clifrerson channery loamy. <br />Torriorthents are very shallow to moderately deep and are well drained and somewhat <br />excessively drained. They formed in residuum and colluvium derived dominantly from <br />sandstone, shale, limestone, and siltstone. Torriorthents aze highly variable. No single profile of <br />Torriorthents is typical, but one commonly observed in the survey area has a surface layer of pale <br />brown channery loam about 3 inches thick. The underlying material is very pale brown channery <br />loam, very channery loam, or fine sandy loam about 13 inches thick. Shale or sandstone is at a <br />depth of 16 inches. Torriorthents are calcareous throughout. In some areas the surface layer is <br />stoney or flaggy. <br />Permeability of the Torriorthents is moderate. Available water holding 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. <br />Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, <br />limestone, or siltstone. The escarpments are 3 to 50 feet thick and 25 to 2,500 feet long. <br />Most areas of this unit are used for wildlife habitat and livestock grazing. <br />98 -Waybe-Vandamore Variant Rock outcrop complex, 5-30% slopes <br />This map unit is on narrow ridge tops and slide slopes. Areas are elongated and are 20 to 80 <br />acres. The native vegetation is mainly sparse low shrubs and grasses. Elevation is 7,400 to 8,600 <br />feet. The average annual precipitation is 16 to 20 inches, the average annual air temperature is 37 <br />to 39 degrees F., and the average frost-free period is 45 to 75 days. <br />This unit is 45 percent Waybe flaggy clay loam that has slopes of 5 to 30 percent, 25 percent <br />Vandamore Variant channery loam that has slopes of 5 to IS percent, and 20 percent Rock <br />outcrop. Included in this unit are small aeeas of Jerry loam, Owen Creek loam, and Vandamore <br />channery loam. Also included are small areas of soils that are similar to the Waybe and <br />Vandamore Variant soils but are deep and have more or fewer rock fragments. <br />The Waybe soil is shallow and well drained. It formed in residuum derived dominantly from <br />clayey shale and interbedded sandstone. Typically, the surface layer is pale brown flaggy clay <br />loam 4 inches thick. The upper 5 inches of the underlying material is light yellowish brown clay, <br />the next 5 inches is light brownish gray channery silty clay loam, and the lower 5 inches is very <br />pale brown channery silty clay loam. Highly weathered platy shale and interbedded sandstone <br />