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• Page 8 • _ <br />;, ' <br />._. _ _ <br />I <br />~- ~ Soil P'.appng Unit 7: Dark-colored soils with light=colored subsurfac!_ <br />1 - horizons of the cold mountain slopes ; <br />~ ~ ~ <br />~ ~ ~ ~ ~' <br />r ~ ;•tost of this unit is in national forests at elevations about 7,500 feet. <br />:~ ~ ~ %! 'It is all in Colorado except for one area in Utah bordering the La Sa~1 <br />~ ~ r ::' <br />Mountains.: This unit is extensive, comprising 22.5 percent of: the•ba"sin. <br />ji ~ Precipii:ation is plentiful and the water yield is high.;. The short <br />' growincj~season limits crop production to hay and pasture.. 1 <br />1 <br />Tl~e landscape consists of rolling to steep mountainous terrain with <br />i ' interveni~ig canyons, valleys, and outwash fans. Ti7ere are many springs <br />and perennial streams. The vegetative cover consists of spruce-fir,, ' <br />' ponderosa pine, a=_pen, oakbrush, and some open grassland areas. <br />i ' <br />. ~ About 69 percent of the soils in this unit have dark-colored surface ? <br />]ayers,.high in organic matter, 7 to 20 inches thick. Underlying this <br />is a ].iyi~t-colored, gray, subsurface layer that is 4 to 16 inches thick. <br />Textures are: moderately fine to moderately coarse. Belo'a the yray.sub-' <br />surface layer is a blocky sub=oil that is .'.ore clayey than the overlying <br />layers. These horizons are neutral to slightly acid. ,Gravel and stones <br />are often present. 'rfie ur:derlying parent material is sometimes calcareous <br />-, and is usually at depths of 30 inches or more. About ]8 perc•:nt of this <br />unit has_soils that are lees than 20 inches deep over pa;:ent materials. <br />Included with these soils are rock Outcrops, Another 15 percent of the <br />soils have dark-colored surface layers less than 6 inches thick overlying <br />a gray subsurface layer and blor_ky sipsoils. The soils are: slightly acid <br />to ,acid, Poorly drained alluvial soils compose the remaining 3 percent <br />of ~ihe unit. <br />i.: <br />Soil ifaypin~ Unit 9: Dark-colored soils and rock outcrop of the alpine <br />~' ~ re-ion _ _ <br />There are seven small delineations of this unit. They enco:epass high <br />mountain peaks and ridges at elevations above 11,000 feet. Tiris unit is <br />tl~e least extensive in the basin but precipitation and water yield are <br />high. Sediment yield is lr_ss ti,an 0.2 acrr--feet per square mile per year, <br />The landscape is char•>_c~Frized Ly ruggr:d :aountain peaks with intervening <br />ridges and valleys, all above tiro}:erline. Slopes are steep to very <br />stern. This is a -.rinds',:rpt area of alpine r;~adows and rock, <br />This unit is mainly co^~posed of three cr_.mnenents. All of the soils have <br />dark-colored surface layers and are acid, About 50 percent of the unit <br />is rock outcrop and talus slopes, R.1>ont ZS percent is shallo•.a well- <br />,iraine3 soi.is high in oraanic utter. Surf~r_e Iayr-rs and subsoils are <br />usually rocky or stony with r..oderately sandy textures overlying bedrock <br />at 20 inches or less. another 20 percent consists of r.~oderatr_ly deep, <br />lc~rr,y tcr.tured, well-drai.n,:d turf soils containing stone and gravel. <br />Under].y~ng parent raatcrial is at depths of 20 to 90 inches. The <br />remaining 5 p~:zcent of t}:e unit consist of poorly drained peat and bog <br />soi7.s in low dchrc;sions and drainages. <br />i <br />1 <br />i <br /> <br />