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• 7/ _.~ <br />c7A--Silas I~;>rn, dry, 1 t.. 10 percent sloyes. This <br />;eep, wel I dr•air~ed s~~i I is in r~ar-r~;w alluvial valleys. It <br />fc~rrned in al I.iviurn. Elevatii~n is 7,Oir0 to ~=,500 feet. The <br />average annual precipitation is about 13 to ~~ inches, the <br />average annual air- temperature is ~7 to 40 degrees F, and <br />tl-~e average frrst-rr•ee peri~;d is 4!i to ~_,r? days. <br />Included ire tr~is unit ar-e small areas cif s:~ils sirnilar- <br />t~~ this Si I as s~; i I but ar-e Cobb I y ar• stony and srnal I areas <br />cif the poorly drained AquDlls soils. <br />Typically, th,_ surface layer is a very dar4; grayish <br />brown barn 14 inchc,s thick:. The underlying rnater-ial is <br />gr-ayi sh brown sandy c I ay I Darn tc. F,0 inches or- more. <br />• F'er•rneat~i I ity ~f this Silas sc~i I is rnaderate. Available <br />water capacity is r~'~oderate. Effective m otir~g depth is GO <br />inches .; r• rnor-~. F::r~off is slow, and the hra~ard cif water <br />erosion is slight. <br />This ur~i L• is used fc~r• I ivestocV; gr-azirig ar~d wi Idl ife <br />habitat. <br />Ttie pc~ter~tial pfar~t corr~rnunity r.~ri this unit is mainly <br />t~asir~ wi Idrye, wesser-n wheatgrass, str•earnbar~4; wheatgrass, <br />rrc~uritai n snowber•r•y, Co I urnb i a need I egr-ass, rnuttc~r~gr•ass, <br />slender- wheatgrass, and rn~;untain big sagebrush. The avera3e <br />annual production of air-dry vegetation ranges from x,000 to <br />=,000 pounds ~~er acre. <br />u <br />