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<br /> <br />boundary. The soil occurs on high terraces. It has a profile similar to <br />the representative profile for the series. <br />Permeability is moderately slow and the available water capacity is <br />moderate. This soil is not highly susceptible to erosion. <br />(MOA) - Mesa Gravellv Clav Loam, 0 to 2 Percent Slopes <br />This soil is on old high terraces. It has a profile similar to the <br />representative profile for the series, but the surface layer is 15 to 30 <br />percent gravel and cobblestones. <br />This soil is not highly susceptible to erosion. <br />(Ru) - (Rr) Twic Torriorthents-Rock Outcrop Ca~miex 12 to 90 Percent <br />Slopes <br />This unit has recently been reclassified (fornierly named Rough Broken <br />Land) and reassigned a new symbol, Rr <br />This map unit occurs on steep side <br />slopes of mesas and terraces. <br />The typic torriorthents portion consists of residuum and colluviian <br />from -interbedded sedimentary units. The soil is shallow to very deep and <br />well drained. It is a dry soil and exists on a broad range of slopes and <br />has variable texture. No single profile is typical and there is no mollic <br />epipedon. In places a shallow surface layer may exist over the substratian. <br />The rock outcrop portion consists of large exposures of interbedded <br />sandstone and shale parallel to the surface and as cliffs, breaks or <br />escarpments. <br />-19- <br />