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Map Unit No. 99 Loamy, Pachic/Loamy Skeletal/Loamy Lithic Crvoborolls Complex <br />20 to 45 Perrant slopes. <br />This steeply sloping, well drained soil is on side slopes ridges and foot- <br />slopes of low mountains and hills. Slopes are smooth to broken. The native <br />vegetation is mainly oakbrush,serviceberry, snowberry, mountain big sagebrush with <br />mountain brome, wheatgrasses, needlegrasses, and forbs. Elevation is 6580 to <br />8105 feet. The average annual prPCipitation is about 16.8 to 20.5 inches, the <br />average annual air temperature is 36 to 44 degrees F., and the average frost- <br />free period is 66 to 93 days. Soil temperatures are in the cryic soil zone. <br />Individual areas of this unit are irregular in shape and range from a few to <br />many acres in size. <br />Typically the nearly black to very dark brown (lOYR 2/2-4/2) loam to <br />sandy loam surface layer is about 10" thick but ranges from 9 to 24" thick. <br />In places the organic mulch (A-.V) is 2-4" thick. The subsoil is about 20-48" <br />thick in the deeper, more developed soils. It is a loam, sandy loam or light <br />clay loam in texture and is slightly acid. These soils are interspersed with <br />stony, skeletal soils in places. The C horizon is likely to be a stony loam <br />10 to 20" thick over sandstone. The soils are underlain by sandstone at depths <br />of 10 to 60". Electrical conductivity is low. Sodium Absorption Ratios are <br />low.The ptt ranges from 4.6' to ~.0 but is generally mildly acid. <br />Included with this soil in mapping are areas of sandstone outcrop 10-20% <br />and shallow stony soils 15-20%. Stone fragments may occur on the surface and <br />throughout the soil prnfiL in a.high~proportion of the area. .Possible soils <br />are: Hesperus, Agner, Center Creek, and Detra. <br />Water and air move through this soil at a moderate to rapid rate and <br />surface runoff is moderate. Root development is restricted below a depth of <br />about 10" in places by sandstone rock although cracks and crevices allow deeper <br />root penetration, in some places, to as much as 60 inches. <br />This unit is a fair to poor source for topsoil. Quality of topsoil is good <br />to excellent but is effected by the presence of numerous stones and by sand- <br />stone outcrops on ledges and slope breaks. Quantity of suitable topsoil may <br />have to be limited to an average depth of about 12" to 15" and to be selected where <br />fewer rocks show on the surface. Topsoil salvage operations are limited by <br />steep slopes of 20-40Y, and presence of sandstone fragments and outcrops. The <br />most limiting factors for this unit are the presence of stones Qhere selective <br />topsoiling is practiced *_he loamy to sandy loam portion in an excellent topsoil <br />for revegetation purposes. <br />-19- <br />