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<br />Derrick Scrics
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<br />RIO CRA NUE COUNTY AREA, COI.ORAUO
<br />The Derrick series consists of well rlrainerl soils ]0
<br />to 20 inches deep over gravel and cobbles. These soils
<br />fm'merl in cobbly alluvium on alluvial fans and terraces.
<br />Slopes are 0 to 3 percent. Clevation is 7,(i00 to 8,20(1
<br />feet. Natural vegetation is dominantly blue grams, ring
<br />mutely, s:uul dropseed. :rod low rabbitbrush. 7•he
<br />average :ulnual precipitation is about 7 inches, the
<br />mean annual air temperature is about 41° F, sort the
<br />frost-free season is 90 to 105 days.
<br />In a representative profde the surface layer is dart(
<br />grayish brown rnbbly loam about 4 inches thick. The
<br />subsoil is dark bro~en eery gravelly clay loam ar very
<br />g1:lvelly loam about 13 inches thick. 1'he substratum
<br />is gravel, cobbles, and sand that extend to a depth of
<br />60 inches or more.
<br />Permeability is moderate, and the available water
<br />capaciq• is loly m' moderate. P.eactim] ranges fran
<br />neutral to moderately alkaline. The effective rooting
<br />depth is 10 to 20 inches.
<br />These soils are user) for range, irrigated crops, and
<br />wildlife.
<br />Representative profile of Derrick cobbly loam, 1,500
<br />feet west of the uortheasL cmmer sec. 2, T. 37 N., P,.
<br />7 E.
<br />Al-0 to 4 inchrs; light bro,vnish gray (ID1'R G/2)
<br />cobbly Ina m, dark grayish Lrown (101'R 4/?)
<br />moist; mode. ra tc fine, granular struc[u re; soft, er n~
<br />friable; :;5 percent cobbles and gravel; neutral;
<br />gradual smooth bmmdan~.
<br />B2t-4 to 74 inches; brown (5.5T'P. 5/3) very gravelly clay
<br />loam, dark brawn (S.SYR 4/31 moist; mcak
<br />medium prismatic structure parting Lo mode rate
<br />fine subangular blocks; hard, triable; thin nearly
<br />continuous clay films on pods and in root channels;
<br />f0 percent cobbles and gravel; mildlt• alkaline;
<br />clear a~aev boo acts n•.
<br />A3ta-I4 l0 1i inches; brmcn (101'R 5/31 very gravelly
<br />loam, dark bro,vn (]OYR 4/3) moist; ,ccak medium
<br />subangular blocky structure; soft, very friable;
<br />few thin patchy clay films on peels; i0 percent
<br />cobbles and gra ccl; visible seconds n' calcium carv
<br />boosts occurring as corr. retinas in thin scams an4
<br />streaks and as roa bugs nn fe,a rse fragments; cal-
<br />careous; moderately alkaline; gradual wavy bound-
<br />are.
<br />IICta-]i to GO inches; very' gravelly sand; carbons le
<br />coatings m, coarse fragments; GO percent cobbles
<br />and gravel.
<br />The Al horizon is 3 to G inehcs thick and is cobble loam
<br />to gra vclly sa ndv Ina m. 9'hc It^_l hm'izm, is 4 In 12 inchrs
<br />thick :uul is vr,rv cobble clan loam in scone peduns.. Thr.
<br />con trot n( gravel and cublrlrs in the A hm~izm, ranges from
<br />35 to 50 percent and from 3S lu Srr pe rcrnt in the A hm~iznn.
<br />Urpth to lime r:mges from S to 30 inchrs.
<br />De-Ilcrrick rubble lu:uu. This pearl)' level 01' very
<br />genth• sloping sail occupies alluvial fans ;nut terraces.
<br />Slopes arc 0 lu 3 percent. About I=, percent of this unit
<br />is included ;Yeas of rr;l}'point gra~~elh~ sandy loam and
<br />small areas of I'laturu loam and Uunul cobbh sand)'
<br />lorlnl.
<br />` Runoft is sloe. •I'hc erosion haz:u'd is slight.
<br />7•his soil is used nuliul}' for range amt wildlife. Sonic
<br />small areas :ne used I'ur irrigated crops. Gapabilit}'
<br />unit 1\'s-1 irri~atcd. Vlls-7 nunirrigatcrl; \IounL•lin
<br />Ouhtash range site.
<br />Dunul Scrics
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<br />The Uunul series consists of excessively drainr:d
<br />soils f, to ]0 inches deep over gravel, cobbles, and sand.
<br />These soils fm'med in cobbly alluvium ou alluvial fans.
<br />Slopes are 0 to 1 percent. Elevation is 7,f00 to 7,90(1
<br />feet. Natural vegetation is dominantly blue ;,•rama,
<br />Indian ricegl:'tss, snakerveed, and low rabbitbrush. The
<br />average annual precipitation is about 7 inches, the
<br />mean annual air temperature is about 41° F, and the
<br />frost-tree season is 00 to 105 days.
<br />In a representative profile the sm'face layer is dark
<br />grayish brown cobbh• sandy loam about 10 inches thick.
<br />The underlying material is dark gray very gravelly
<br />sand that extends to a depth of 00 inches or mm'e.
<br />Permeability is rapid, and the available n•atcr
<br />capacity is low. Reaction is moderately alkaline. The
<br />effective rooting depth is fi to 12 inches.
<br />These soils are used fm• irrigated crops and for
<br />range. .... ,.
<br />Representative profile of Dunul cobbly sandy lovlf,
<br />1,500 feet east and 300 feet north of the southwest
<br />corner sec. 18, T. 40 N., R. 8 E.
<br />Ap-D to 30 inches; grayish brown (IOFR 5I2) cobbly
<br />sandy loam, dark grayish brown (10]'R 4/?)
<br />moist; moderate fine granular structure; soft, very
<br />friable; 35 percr.nt cobbles and 25 percent gravel;
<br />slightly calcareous; moderately alkaline; dilruse
<br />smooth boundary.
<br />C-IO to f0 inches; gray (IOYR 5/]) eery gravelly sand,
<br />dark gray' (IOYR 4/1) moist; single grained;
<br />loose; i0 permnt gravel and cobbles; calcareous;
<br />modenlely alkaline.
<br />The A horizon is 4 to ]0 inches thick. 1t is gravelly sands
<br />loam in some finds where most of the cobbles have been
<br />removed by rockpicking machinery. The content of gravel
<br />and cobbles in the A horizon ranges from 35 In .0 pr. rcrnl.
<br />The C hnrizw, is ce n• gravelly sand or very' cobbly sand.
<br />Dn-Donut cobbly sand}• loam. This nearly level
<br />soil occupies large areas at the upper end oC alluvial
<br />fans in the north-central part of the Area. Slopes are
<br />0 to ]percent. About 20 percent of this unit is included
<br />areas of C~u:mlon gravelly sandy loam and 10 percent
<br />areas of A`w•te gravelly sanrl}~ loam.
<br />P.uno(T is slow. The erosion hazard is slight.
<br />IC water is available, most of the acreage is used for
<br />irrigated poLltoes, small grain, alfalfa, and vegetables.
<br />Some areas are used for range. Capability writ 1Vs-1
<br />irrigated, Vlls-7 nmlirrigaled; itlomttain Out~~'ash
<br />range site.
<br />hmbnrho Scrics
<br />The Embargo series consists of moderately deep.
<br />well rhained soils. These will fmmerl in residuum
<br />~eeaLhered from rhvolite nn mountainsides. Slopes arc
<br />Ifl l0 2S prrcenl. Elevation is 9,000 to 1(1,000 feM.
<br />Natural vegetation is donlin;wlly nuwnL•rin nnlhl}',
<br />Arizona fescue. Parry uatgr;rss, :Ind neerlleanrlthrcul.
<br />The average annual InecipiL•Ition is shout 10 inches,
<br />the menu annual an' temperature is about 3f° }~', sort
<br />the frost-free SC85pr1 IC 70 Lu 9u dad s.
<br />In ;t representative prulile the surface ht~~er is d;u'1:
<br />b ro~rn vcrc clone loam :,bout S inches thick. 'I'hc sub.
<br />soil is d:u~h brown very stony Inam, clay loam, m' cla7.
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