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<br />~~) SJIL $TI:2VLY
<br />.. ;:,,,i .,., :a (~acnnr soils. '. ..: cnntnles ix nn
<br />... u:>;.ti:,:..:nailllr i:t ll:r nurtl~,ra>Irr:; scri. of the :\r.:::.
<br />.. ~>t a:,•.:> err ni, :,• Shan •'o aca'r; in siz~• :utd arc irregu-
<br />.,.: in :. •. tii;i::1„ s,,ils arc n,•:n• ri,i„rlops and nn
<br />r:rr;n•r ~i,,.,;s, In ~,,,,a pla<rs (7a,j~uor soils arc nc,u• the
<br />h,:~,~ n; "Dors.
<br />In~•hl„r,l ll'itil ;!.is contl)Ia~ in mappin;, arc areas of
<br />l;onahill silt}• cla}• !Want, :, to 0 percent slopes; Colby
<br />sil;~• rl::y ioaul, ;i to ~ percent. slopes; and S;uusil clay,
<br />:; co ]3 percent. slnpe.'1•hese included soils nmhe up about
<br />l:i p,~r,^, nt of each moppcrl area.
<br />:a;nnlF is rapiri o:t this cufi1131ii~. 1110 p.l-OSI011 liit8llr(1
<br />,, hi_h.
<br />'i'bis cnmp!e~ is best suited to pastalre. T3ccause the
<br />soils ar,• shallow Weer bedrock, t.itcy arc used for (lry-
<br />1ar.,1 Drop; and pasnu•c. (Capability unit VIc-3, nonirri-
<br />ratcri; tree suitability group 6)
<br />$;s:ni'e SC:';C$
<br />Tho Sixmile srrics is made up of moderately deep,
<br />tmll•draincd saih. These soils formed on upland ridges
<br />and side slopes in calcareous ]namy rasidnnm weathered
<br />rrnm shale. tilnnrs arc 10 t.o 50 percent. Taevations are
<br />:1,300 to f,i,Ofi fcet_ The native vegot.ation is mainly mid
<br />~nlsscs. :!none! precipitation is 14 to IS inches. 11lean
<br />annual air temperature is 48° to 52° r., and the frost-
<br />i rec srtsnn is about 120 to 140 davs.
<br />In a represcnhfticc profile the surface layer, about 4
<br />inches thicL-, is strat~ly calcareous, reddish-hroten stony
<br />loam. The undet•lvin~ Material is dray and reddish-gray
<br />light ciap loam :ibnnt. 20 inches thic);. Underlying this
<br />is n-cathcrcd shale. Soil reaction is moderately alkaline.
<br />ji~milc soils hoes moderate permeability. Available
<br />a'arcr capacifp for the profile is moderate to high. Roots
<br />can 1)enetrate to a depth between 20 and 40 inches.
<br />These soils arc used for grazing.
<br />Rc.presenro.tive profile of Sixmile stony loam, 10 to 50
<br />percent. elopes, located G50 feet west and 1,000 feet north
<br />of the southeast. cot•ller of sec. 8, T. 3 ir,, R. ?0 R~.:
<br />A1--0 to 3 inches. dnri; reddish-grny (5FR 4/2) stony loam,
<br />da rl: reddish hTORT (SFR 3/?) when moist; moder-
<br />arc, fine, granular stntMUre; soft, ren• friable; many
<br />stones and boulders; strongly calcareous; moder•
<br />atcly ail:alinc; gndna 1, wavy. bnundmq.
<br />Cl--t Ut ].1 i~,dtes, ^ror (5]'R OLI) light clay lna m, dnrh
<br />bra>' (LFR a/Ij when moist; mas_civc; hard, very
<br />irG, :,le: stt»ngb• calcareous; moderately alkaline;
<br />_: tdr.n 1, nn vy boundary.
<br />C:-'_0 m (i inches, reddish-gray (]OYR 5/1) light clay
<br />las m, d.9 rl: reddish gray (lOFR 4/I) when moist;
<br />tea n.cire: hard, very friable, strongly ralcarcous;
<br />ntr:dcra tc4y alkaline; gradual, wavy boundary.
<br />C3~30 [n fo inches. reddish-goy (IOYR 5/1) partially disin-
<br />tegra[al shale.
<br />'fbc .\ horizon rnngrs from 3 M fr inches in tbichnecs and
<br />f root lo:uu to light cloy loam in Iez titre. The C horizon ranges
<br />frn;a l~,a:a Ir. elac loam in teyhtra. Depth to bedrock ranges
<br />:roe, ?6 tr. 4n inches.
<br />S::<:.iir s;;,r,p :Dam, ]0 to 50 percent slopes (SmFI.-
<br />':'Lis aai: i; nn the uplands on the western side of steep
<br />°'~'~~•, in Ihr• western part of the Arca. In most places
<br />it is ;;: areas n:nre titan 100 acres in size.
<br />TrcL;rir•r? with this soil in mapping arc nnrmw bands
<br />of :..:;; ontcrnp and I»ch escarprents. line!: outcrop
<br />is tiar,n:;;hont the area, and iu most places the escarp-
<br />uronfs arc. mt rirhetnps. Also included near the base of
<br />S1opC5 al'C small areas u( Colluvinl ]and. Tnclndecl Pock
<br />outcrop, rn,:k csc:n•pu)ent, and Cnlluvia] land rnakc up
<br />about 20 pr.rcent o! each Mapper! area.
<br />7tunott is rapid wt this soil. The erosion hazard is
<br />high.
<br />~VI of the ncreagc. of this soil is in native ran;;e. (Ca-
<br />p)tbilit.y unit VIIs-1, uo(lirrigaled; tree suitability gtnnp
<br />G
<br />mCl'rACCrSsCil•~)IiIC:I ~$
<br />tl•til`i'ftCL' p`C;U'1)111C'al5 (Tel ill'C 011 H)fl& tilUl)es Pi nl,i mtt-
<br />wash fans and terraces in the central part of the 11rc5
<br />(fi,ir. 4). Soil areas arc long and narrow.
<br />These areas consist. of undilPerentiaterl shalimv soil=
<br />that have many cobbles and stones on the surface. In
<br />many places there is merely a thin layer of cobbles over
<br />sandstone or shale.
<br />Included in mapping are some deeper soils near the
<br />bottom of slopes,
<br />RunofF is rapid, and the ernsion hazard is high. Terrace
<br />escarpments talc in water slowly, but in places intake
<br />of water is influenced by the amount of stones and coi>ble-
<br />stones nn the surface. On1•y limited moisture is available
<br />for plants because these undifferentiated soils are sltai-
<br />]ow.
<br />Terrace escarpments is not spited to cultivation. It is
<br />used for native range. (Capability unit VIIs-1, nonirri-
<br />gate.d; tree suitability group 6)
<br />Valmont Series
<br />The Valmont series is marls up of deep, well-dl:ained
<br />soils. These soils formed on old high terraces and benches
<br />in gravelly and .cobbly loamy allut~um. Slopes are 1 to
<br />25 pe~cent.);levations are 4,900 to 5,500 feet. The native
<br />vegetation is mainly tall and mid grasses, Annaa] precip-
<br />itation is 12 to 18 inches. D'fean annual air temperature
<br />is 4R° to 52° r., and the frost-free season is about 140
<br />to ]55 clays.
<br />in a representative profile the surface layer, abort 4
<br />~inr-tics thick, is a grayish-brown light clay loam that con-
<br />tains vnrving amounts of coUUles aid grat•cl. The upper
<br />part of the subsoil is brown clay loam about 3 inches
<br />thick. The middle part is brown light. clay atlout 13 inch-
<br />es thick. The lower part is caleareous, lighbbrown grav-
<br />elly clay loam nbont 4 inches thick. The underlyinc ma-
<br />terial is calcareous, pinkish-white and light.-brown vely
<br />r*i•avcll•y loa.nt. In the surfncc la}'cr, soil rcactimt is nau-
<br />ti•at, but with increasing depth it becomes moderately
<br />all;:tl inc.
<br />Vahnmrt. soils have rnodcratcly slow pei•iucability.
<br />Available water cap :city for the pmfile is moderate.
<br />Roots can peneta:atc to a rlopth of GO inches or more.
<br />These soils are used for irrigated and dtyland crops
<br />and for pastatre.
<br />Rrpresen•tad•ice prnfilr. of Valmont clay loam, S to 5
<br />percent slopes, ]orated S00 feet oast of the nm-thwest cor-
<br />ner ofsec. 7, T. 3 N., R. fig W.:
<br />Al--0 to 4 inches, grayish-bmwn (IOYR S/2) light Nar ion m•
<br />very dark grnyish brown (iOCR 3/2) n~ia, ~+, .~.ist;
<br />ntmlcrdc, floc, 6rnnular stntcture; 6nft, vwy iS-I-
<br />able; 6 percent grovel; neutral; Glen r, smooth
<br />boundary.
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