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• frE-=-Cch•.L••Rork aulrr»p rv,mplec, 5 In 2.i prrrcnt
<br />slnpc•. This gently sloping to moder }• steep map-
<br />ping unit is about 50 percent Celestt~tremel}' stunt
<br />loam and 95 per(•ent Rock outcrop. ]t is mainly in
<br />mnuntninons areas. L] many small areas the slope
<br />ranges to ]00 percent. There are many narrow valleys
<br />:urd dr;tinage+rays. Gullies 3 to 8 feet deep and 3 to ]2
<br />feet wide have framed in most of the valleys. These
<br />gullies tarry runuft dm•inbr and after rains. Pock out-
<br />crop consists of exposures of bedrock and vertical cliffs
<br />and escarpments +vith ]0- to 70-foot drops. Blany large
<br />boulders are on Lhe slopes below the escarpments.
<br />lncduded e•ith this unit in mapping are small areas
<br />of Judcro loam in the narro+c valle)•s and small areas
<br />of a very shallow soil, less than 10 inches deep over
<br />bedrock, that is intermingled +rith the Pack outcrop.
<br />About 5 percent of this unit is included areas of Garita
<br />cubbl}' loam and Travelers very stm])• loam.
<br />Runoff is rapid. The hazard of +rater erosion is high.
<br />This nullq+ing unit is used fur range and ++'ildlife. It
<br />is an important habitat for deer. Capability unit \'IIs-1
<br />nonirrigated; Celeste soil in F.ocky Foothills range site;
<br />Rock outcrop not assigned to a range site.
<br />Derrick Series
<br />The Derrick series consists of well drained soils 10
<br />to 20 inches deep Deer grave] and cobbles. These soils
<br />fm med in cobbly alluvium on alluvial fans and ten aces.
<br />Slopes are 0 to 3 percent. Elevation is 7,600 to 8,200
<br />feet. ?`'atural vegetation is dominantly blue grama, ring
<br />muhly, sand dropseed, and ]ow rabbitbrush. The
<br />average annual precipitation is about 7 inches, the
<br />mean annual air temperature is about 41° F, and the
<br />frost-free seasm] is 90 to ]OS Bars.
<br />In a representative profile the surface lacer is dark
<br />gra)'ish bra.rn cobbly liiam about 4 inches thick. The
<br />subsoil is dark brown very gravelly clay loam or very
<br />gravelly loam about 13 inches thick. The substratum
<br />is gravel, cobbles, and sand that extend to a depth of
<br />CO inches or more.
<br />Fermeability is moderate, and the available water
<br />capacity is lo+v m' moderate. Reaction ranges from
<br />neutral to moderately alkaline. The effective rooting
<br />depth is l0 to 20 inches.
<br />These soils are used for range, irrigated crops, and
<br />wildlife.
<br />Representative profile of Derrick cobbl)• loam, 1,500
<br />feet west of the na'theast corner sec. 2, T. 37 N., R.
<br />7 E.
<br />Al-0 to 4 inches; light bro~ynish gra}• (]0]'R 6/2)
<br />rohbl}• loam, dark grayish bro~rn (lOYR 9/2)
<br />moist; moderate fine granular structure; soft, eery
<br />friable; 35 percent cobbles and gravel; neutral;
<br />gradual smooth Loundary.
<br />B2t-4 to 19 inches; brou~n (7.5]'R 5/3) eery gravelly clay
<br />loam, dark bro+rn (7.5 ]'R 4/3) moist; ,teak
<br />medimn prismatic structure parting to moderate
<br />fine suhangular block}; hard, friable; thin nearly
<br />continuous clay films on peds and in root channels;
<br />60 percent cobbles and gravel; mildly alkaline;
<br />clear +cay}• boundary.
<br />Rica-19 to 17 inches; bro+vn (]OYR 5/31 eery gravelly
<br />loam, rla rk bro,vn (10]'R 9/3) moist; weak medium
<br />subangular blocky structure; soft, eery friable;
<br />fe,c thin patchy clay films on peds; 70 percent
<br />cobbles and gravel; risible secondary calcium car-
<br />bonate occurring as concretions in thin seams and
<br />streaks and as coatings on coarse fragments; cal-
<br />carrous; moderately alkaline; gradual +rarp bound-
<br />ary.
<br />]]Cca-17 ~to 60 inches; eery gravelly sand; carbonate
<br />coatings on coarse fragments; 60 percent cobbles
<br />and gravel.
<br />The Al horizon is 3 to 6 inches thick and is cobble loam
<br />to gravelly sandy loam. The B2t horizon is 4 to 12 inches
<br />thick and is ver}• cobbly clay loam in some pedons. The
<br />content of gravel and cobbles in [he A horizon ranges from
<br />35 l0 50 percent and from 35 to 70 percent in the B horizon.
<br />Depth to lime ranges from 8 to 30 inches.
<br />Dry-Dtrrirk r»Lhh• loam. This nearly level or eery
<br />gentl}• slopingoccupies :Qiuvial fans and terraces.
<br />Slopes arc 0 to rcent. About 15 percent of this unit
<br />is included :n'eas of Graypoint gravelly sandy loam and
<br />small :wens of Platoro loam and Dunul cobbly sandy
<br />loam.
<br />P.unoff is slo+v. The erosion hazard is slight.
<br />This soil is used mainly for range and +vildlife. Some
<br />small areas are used for irrigated crops. Capability
<br />unit 1Vs-] irrigated, ~'11s-7 nonirrigated; Dlountain
<br />Outwush range site.
<br />Dunul Scrics
<br />The Dunul series consists of excessively drained
<br />soils 6 to ]0 inches deep over gravel, cobbles, and sand.
<br />These soils formed in cobbly alluvimn on alluvial fans.
<br />Slopes are 0 to 1 percent. Eleeation is 7,600 to 7,900
<br />feet. I~ratural vegetation is dominantly blue grama,
<br />Indian ricegrass, snake+veed, and low rabbitbrush. The
<br />average annual precipitation is about 7 inches, the
<br />mean annual air temperature is about 91° F, and the
<br />frost-free season is 90 to 105 days.
<br />In a representative profile the surface layer is dark
<br />grayish brown cobbly sandy loam about 10 inches thick.
<br />The underlying material is dark gray eery gravelly
<br />sand that extends to a depth of 60 inches or more.
<br />Permeability is rapid, and the available water
<br />capacity is lo+r. F.eaction is moderately alkaline. The
<br />effective rooting depth is 6 to ]2 inches.
<br />These soils are used for irrigated crops and for
<br />range.
<br />Representative profile of Dunul cobbly sandy loam,
<br />1,500 feet east and 300 feet nm'th of the south+vest
<br />corner sec. ] 8, T. 90 N., R. 8 E.
<br />Ap--O to ]0 inches; grayish bra,en (]0]'R 5/2) cobbly
<br />sandy loam, dark grayish Lrow'n (]O]'R 9/2)
<br />moist; moderate fine granular structure; soft, eery
<br />friable; 35 percent cobbles and 25 percent gravel;
<br />slightly calcareous; moderatel}• alkaline; d~fiuse
<br />smooth boundary.
<br />C-10 to GO inches; gray (lOFR 5/1) very gracelh' sand,
<br />dark Gray (10YR 4/1),moist; single grained;
<br />loose; 70 percent gravel and cobbles, calcareous;
<br />moderately alkaline.
<br />The A horizon is 4 to ]0 inches thick. It is ]rracellp sandy
<br />loam in some fields +vhere most of the cobbles have Lren
<br />removed by rockpicking machinery. The content of gravel
<br />and cobbles in the A horizon rangrs from 35 to .0 percent.
<br />The C horizon is eery gravelly sand ur very cobbly sand.
<br />Dn-Donut cobbly s:md)~ Ina m. This nearly level
<br />soil occupies large areas at the upper end of alluvial
<br />fans in the north-central part of the Area. Slopes are
<br />0 to 1 percent. About 20 percent of this unit is included
<br />areas of Quamon gracell)' sandy loam and 10 percent
<br />areas of Itm'te gracell} sandy loam.
<br />F.unoff is slow. The erosion hazard is slight.
<br />]f water is available, most of the acreage is used for
<br />irrigated potatoes, small grain, alfalfa, and vegetables.
<br />Some areas are used for range. Capability mlit 1'.'s-1
<br />irrigated, VIIs-7 nonirrigated; i`Iountain Outwash
<br />range site.
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