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<br />sag=brush dominates on deeper, .Wore loamy sits along drainageways. Grass occurs <br />on the shallow ridgetop sites and in disturbed sites, <br />At lower elevations, soils have developed primarily from alluvium with s•nall <br />areas of aeolian deposits on lee sides of ridges. These soils are mostly deep <br />with grass, sagebrush-grass or sagebrush-greasewood vegetation types. <br />Sagebrush-greasewood is indicative of higher levels of sodiwn concentration. <br />A pattern of grazing use has been superimposed on the natural schane. fhe result <br />Was been soil erosion and alteration of vegetation communities. 'Minter sheep <br />grazing has resulted in overuse of south and west aspect sites 'with subsequent <br />deterioration resulting in invasion of annual grass and 'weed species. Another <br />• consequence is the resultant erosion wnich has ranoved the upper 2 to 6 inches <br />of topsoil in many locations. This material has bean redeposited on valley-filling <br />fans as a thin surface cap. Prairie dogs have brought subsoil to the surface <br />in a number of locations. 'The disturbance brought by shaetwash inflow and high <br />prairie dog populations has served to provide media for annual grass and weed <br />invasion of the deeper soils as well as shallow sites. <br />• <br />II.I-5 <br />