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<br />`OIL SUR\'F, ]'
<br />adjolnLuhnnsuil:. T6cc:n'csuldlrrth;ull.nhrnl=oils;nnl
<br />tact: the slron~ :lrrnmulalion of sccond:n'c calcium car.
<br />bonalc pre=cnL in those =oils.
<br />Sa_chrush. shad~calc, gallcta, bloc er:una. and lccstern
<br />lchcalgra~s make up must ~f t.hc cmrr on Shac;ulo soils.
<br />These lolls ;u'c only Inorleratcl~ prodnctice of tilled
<br />crops an(1 :ne bract use(1 as ]lathe ran_c.
<br />Shacano san(Iy clay loam, Z lo;i percent Slopes IShel.-
<br />This soil Ss on ^cntlc sloping and undulatin« upl:ul(1
<br />hills and ridges and tops of mesas. It has a profile simi-
<br />lar to the one rtesr.rihell n> Icpical of (hc, Shinano series.
<br />Dlost of the acrcl~_c is in the westcru :uxl sonlhcastcrn
<br />ports of the .\rca.
<br />This ..=.oil supports a fiat coccr of nali\'e grass, blush,
<br />and scattcrc(1 Lrces and is used prim;u'ih' as ]:vtge. IL
<br />is not suitable for tillage, because bcdrocl: is fairly near
<br />the surface. It is moderately susceptible to erosion.
<br />(Capabilitc unit 1'Ie-1 nonirri_atcrl; IVe-3 irrigated)
<br />Shawano sandy clay loam, 5 to 10 percent slopes
<br />IShCI.-This soil is on the tops of mesas and on upland
<br />hills an(1 ridges. IC has a profile similar to the one de-
<br />scribe(1 as t}'plcal of the Shacano series. Most of the
<br />acrea~~c is iu the ]eastern and southeastern parts of the
<br />A rca `
<br />This soil supports a fair coccr of native grass, brush,
<br />and SC:LttCtC(l ttCeS :lll(l is usc(l mainly as ranee. It is
<br />not suitable for tillaee. It is mo(leratclc susceptible
<br />to erosion. (Capabilit}• unit VIe-1 nonirri~nted)
<br />Travessilla Series
<br />The soils of the Travessilla series are shallow, well
<br />drained, and mo(erately coarse textured. They are grass-
<br />land soils that formed on upland hills and rides and
<br />ml the erl_~e of mesas in calc:u'coas material weathered
<br />residually fi'ont the tnulerl} ing sandstone bcrlrocl:-. Soils
<br />of this series are moderately extensive in the .\rca and
<br />occur mainly in [he western half.
<br />Travesill:t soils 6acc a I1;_'ht b1'0\\'111511-gra\ Ol' el;l\'-
<br />isb-bro\vn, friable, eranular surface ]a\'cr 3 to 3 inches
<br />thick. They hace~a moderately coarse texhn'ed. cal-
<br />careous subsoil that has eery wrtk, 5llbllll^lllal' block}•
<br />structure. 'The subsh'atunt, whiClt be~•ins 1? to 1S inches
<br />below the surface, is hard sancLtonc-bedrock.
<br />'These soils arc mo(leralcly susceptible to erosion. The}•
<br />yield later amounts of runolt lvatcr. 'I'hc ors :ulic-matter
<br />content is tole. and the structure is unstable.
<br />T}'picnl profile of 'I'ravessill:t talc sandy lo:un. °_00
<br />feet north of the southlcest corner of sec. ;;5, T. L`1 \.
<br />P,. 10 11'. Olon[rose County)
<br />.\1-ll to i inchoc, line sa udc Ino nt: IhhL Ian ncuiJi crac
<br />(]0]ai G%'1 ~chcn Jrr. Oro ci.h brrmu (70]'1: 3/'.I
<br />~chen moiSL: mngr ra lr. line cla nulnr :uul ('ruwL
<br />~I ruclnrc; salt v'hru dre. crrc frig blc ~rh~~n mni~t:
<br />ca lr:u'cuus: Pll S.ll; clc:u'. :nunolh Lou uda ry.
<br />(;-I to ~ ~m'lie=. line ~audc In:un: hchL Lrnv ui>It ::roc 11111'1(
<br />I%/') ~chcu dre, ~ru risk Lruwn (]OYR :~%') when
<br />' woi=[: ~lighllc lun'd ~chcn dre. rcrc fri;lblo r~hcu
<br />moist: mossier, calr:u'coti:; pll ~:': rlca r. sm~~ulh
<br />bounda~;r.
<br />Il-5 inches"}. b:vd, calcareous sa nrlslone. ,
<br />These =oils arc fairly nnifornl. On the ..=.urfacc arc
<br />varying amounts of loose stones and torts. Ll =_omc
<br />places a weal: arcunwlalion o{ calcium carbonate occurs
<br />above the be(h'ork, ~chich i5 at e depth of S ro 1S inches.
<br />'1'raecsilhl toils arc coarser textured and =_hallo~ecr to
<br />berh'ocl: than Shnc:ulo soils, kith ~chich the}' normall]'
<br />occur Thee resemble Pers;tyo SO115, whleh x15(1 al'C shal-
<br />low. but 1'r;n'essilla soils arc coarser textured and arc
<br />Inxlcrlnin by sandstone bedrocl: instcul of by beds of
<br />shale. 'L'hr.]' arc coarser textured and less (leap to bcrl-
<br />rocl: than 1~ruiLt soils, with which the}~ occur in some
<br />places.
<br />Lr their nnLUral sLltq Travessilla soils support a mod-
<br />erate coccr of galletrr. needlaanrl-thrcarl, three-awn, and
<br />juniper. They arc not suitable for tilla~c.
<br />'1'ravcssilla fine sandy loam, 0 to 10 percenf slopes
<br />ITrCI.-'Phis soil is on upland hills and ridscs. IC has a
<br />profile similar to the one described as typical of the
<br />'pracessill:t series. It occurs' throughout the ~\rca but
<br />is most exlensicc in the lcestern half.
<br />'T'his soil supports a fair coccr of ~allcta, needle-an(l-
<br />thrcad, three-at1n, and juniper. It is not suitable for
<br />tillage. Ii' overgrazed it is mo(lerately susceptible to ero-
<br />sion, particularl}' wind erosion. (Capabilit}' unit AIIs-1
<br />nonirrlgated)
<br />Uncompah;re Series
<br />The soils of the Uncompahgre series are deep, some-
<br />whuC poorly ch'ainc(1, and moderately coarse textured
<br />to moderately fine texturr.(l. They formed on flood
<br />plains an(1 ]on' terraces in stratified, calcareous alluvium
<br />(lcrivc<l frwn manv kinds of rock. Soils of this series'
<br />arc extensicc in this _\rea, mainly along the Uncom-
<br />pahgre Ricer.
<br />Uncompahgre soils Lace a gray' or very dart: grag,
<br />friable, granular surface layer G to 18 inches thick. They
<br />h;tce a gray m' dart:-grac, stratified but pre(lominantly
<br />mc(lium-trstured subsoil That is mottled lvlth stams an(1
<br />su'cals of er;tc and brown. The substr:uunt, lvhich be-
<br />_ins at a depth of _0 to ~0 iuches, is ]ieht brownish-grac
<br />or eracish-brown mixed alluvium that is calcareous and
<br />sirnlilicd but prcdmnin;ulth' medium textured. It is
<br />strmlgly mottlcrl with streaks :uul stains of gray an(1
<br />brolcn. The depth to bedrock is GO inches or more.
<br />These soil; are not highly susceptible to erosion. The
<br />ore:ulic-mater content is moderately hi~•h, and the
<br />structure is stable.
<br />'Typical profile of Uncompahere loam, -100 feet east
<br />:Ind 100 feet north of the crater of sec. 7, T. IT V., P. S Z1".
<br />(\lmltrosc Count}')
<br />.11-0 [n l0 inches, loam; ,rap (lOYlt v(1) mhen dry, PCrc
<br />il.u'I: Ornc (IUTr. 3; 1) whcu moia[; modera[c, wc-
<br />dium, Ora nular 5[ructu rc: sliOh[ly haul ~chcu dre.
<br />eery Lriable Cohen moiu; ca lea reous; pl~i S0; clear.
<br />swou[h bouudot'y.
<br />.\C',-10 b) Ill iuches, login: Orac (IOCR f/1) ~chcu dre.
<br />dart: Orgy (lllL1: -I/11 whcu moi.,L; strn tiliud with
<br />thlu tense; of Ilne =audp loam: malice; hard ~chen
<br />dre. friable ~chen uunst; cuwwon. medium. faint
<br />]OSR d/k mot[ICS; cllca rcaus; pII 5.0; Ored u.ll.
<br />smoalh bnuude ry.
<br />l'O-1!1 to fU iuches, loam; IiOht brmcnish Ol:ay (?SY G/_)
<br />,then dre, Oray~gh hruvc^ (,.5] v%_') ~cheu moisC;
<br />Fl c:ltl liMl kith 111111 IenKS Of ^m; Sa mlc loam; 1na5-
<br />sire; hard whCn dry, friable n'hcn moisC; many,
<br />la rOC, distinct lOSR 9/+ uIOC[ICS; Small awount of
<br />quartzitic ~racel; cnlca rcouS; p[I 8.^_.
<br />1'he ihicl:ness of the surface lacer ranges from about
<br />G l0 1? inches. 'The testate varies from place to place.
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