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.. ~. • <br />ti •• <br />EXEiIBIT D-2 <br />Page 6 <br />Tnia u:7i`~ is co~pua::d oz tyro major com7onents. About 45 percent of the <br />;:aft Ys hack outcrop; mai,+Iy.eandatcnA, with came small outcrops o! ahnle. <br />:,pother N9 percenr :,f the unit has ahsllov soils, less than 20 inches, <br />over undeilyinq sandstone and some shale. '1'heee soils are stony and <br />usua:ly nave loamy, light-covered surface layers. The remaining 6 per- <br />c~nt of i;i+e unit }d r„ade up of soils with Berk-colored surface leyere end <br />cix~;1 sliucial awi2e in the Delores and San Miguel River bottoms. <br />Soi.i Napping Unii: s.: <br />This mapping uni'c occupier eeverel ecectered arses from Gateway to <br />Norwood above the Dolores and San Mique~ xivers. Moat of the other <br />delineations are along the south ana west boundaries of the basin. This <br />unf•~ is oz moderate a:ctent alifl encompasses about 10 percent of the basin. <br />Tha ::andscape is characterizefi by large, nearly level to gently eloping, <br />upland valleys, anfi gent'~y si,~ing mesas. Individual mesas are separated <br />by numeroay urainageways that are entrenched to depths of 100 to 500 feet <br />and have at~rp sandstone aal:.s. The dominant cover is sagebrush with <br />some pinyon-juniper aed.rabc:.cokvsh. Most the irrigated and dry crop- <br />ianE and potentia~iy xr:lgei.ie land of the basin is within this unit. <br />Most of •aie soils n tF,is unit ere formed in reddish-brown eolian <br />materials. Others era residual or alluvial from sandstone and shale. <br />About 45 percent of ,:t.e u.iit is well-drained, deep and moderately drop, ' <br />aith dark-colored surface layers. These voila are noncalcareous to <br />depths of 10 to 24 i.~chca but have Blight to moderate zones of lime <br />eccutaulation. They are moderately coerce to moderately fine textured <br />with subsoils that ~rs~usuaiiy finer textured than the surface layers. <br />Another 40 percent o~ the unit is similar to the above except the surface <br />layers are moderaca_y dark-oolored and have a lower organic matter con- <br />tent. Depth to csicareous ~aaterial is 6 to 12 inches. Subsoil textures <br />range from modera~eiy coarse to fins. Lime-cemented cobble and gravel <br />are common belo.: the subsoil. About 10 percent of the unit is lase than <br />20 inches deep over sandstone and shale. The remaining 5 percent consists <br />of a~luvial soils in the drainageways. <br />soli Mapping Vut 5+ Dark-caiored soils of the _old mountain elepea <br />There, are aeverei 6e;iaeatiane oP this unit in both Colorado and Uteh. <br />It is one of the most extensive units, comprising about 22 percent of the <br />basif+. Alcnovgh precipitation is plentiful, the short growing season <br />limits crop production co mainly hay end pasture. <br />