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~.._.. ., <br />~, ~.- - <br />7'Iv;::+; l;ill}+ s~:jls ago on nl ~uvial fans and ~islloy sideslopes at elevations. <br />of 6500 to 8000 feat. Tho average annual precipitu'.ion is about 2U ~inohes, the <br />mran aum+a! air tr.mpnrature is ulrout 44°F., and tho uvonrto frost-Eras period is <br />about t~~i days.. The Zillman soil occupi.ea the broad, sliPhtl;; concave parts'ot' the <br />landscapo. It makos up about 55 percent•af the unit. The unnamed cobbly loam <br />snip occ+anies the sr+mewlrat cor~voz positions. I~, makos uo about 45 portent of `he <br />,unit. Zillmnn di.t'fers in havinT a finer textured subsoil. <br />'.The 7.illman soil is moderat9~~• deep and well drained. It formed in rlaciai <br />o~rtraash frn~; mixed ninorolo~y parent materials. <br />T;~pically the surfnce layer is da••k brown stony loam abo-t 3 inc}~es thicY.. <br />The suh;oil is dark brow+• stony sandy clay loam about 12 inches thick. The <br />Krx:"! <br />-~~'~Y aubstrntum is very stony loamy sand. <br />• Pormoahility is ra id. Fffeative rooting depth is 15 to .25 inc::es and the <br />availelrlo wat~:r oapacity. is 0.14 to 0.1' in.~in. Surface runoff is slow and <br />~,r <br />the erosi>n hazard is alight.' <br />,~ The unnamed cobbly loam soil is moderately deep and well drained. Iz <br />`i ` .. <br />-~ ~ .formed in Riaciel outwash from mixed'min~rology parent materials. <br />Typically the suri'aoe layer is dark broom cobbly loam shout 8 inches thick. <br />The aubstrrface is brawn very cobbly sandy loom about 32 inches think. T:ris <br />grades into sand, cobble, and Prav9l. at depths between 40 and 60 nches. <br />Permeability 1a rapid. F,ffoctive rooting depth is 15 to 20 inches and the <br />availabt^ w~tor capacity is O.U6 t,o 0.1] in.~in <br />erosion haze-d is slit. <br />t'~: ~" <br />• <br />Surfaco runoff is slow and the <br />t <br />