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<br />2S
<br />son. svavsx
<br />This land type ie wtsttitnbie for tillae and ie used
<br />exelusicely as nnhre range. It supports a fair to good
<br />cover of native grass, sage, cactus, and bnisl>r Llnny
<br />wren, ure bate, and Cite steep upper stapes entmot ba
<br />reached by cattle. IQeverthcln~s, these areas ure vaho-
<br />able as nu;e and furnish grazing ]eta in summer and
<br />ni fall. (Capability Imit VIIs~ nonirtfgated)
<br />Rough Broken Land, Shale and TiII Materials
<br />~j Rough brokett ]and, shale and till materials (Rvl aL•enrs
<br />o?t the steeply sloping sides of erosional valleys and
<br />isolated mesas, It rnnsists piincipallp of many ex-
<br />posures of barren elutile and of soils similar to those
<br />described for the Chipetn :utd Persayo sceiaa. In places
<br />there is an Quern-ash of stony till. The slope range is
<br />70 to 40 percent. This land type occurs throughout
<br />the Area but is most ectetisire vast and smith of the
<br />totrn of illontrosc.
<br />This land type can be ttscd only as range becnn,r
<br />of the steep topography and sllullosv soils, T{at. sult-
<br />bnsh and shadsenlc melee up most of the cover, which
<br />is sparse. Erosion is a serious hazard. In many places
<br />gullies have formed an inh•icate pattern and have cut
<br />into the shale parent material lwen .vhen rainfall is
<br />normal., large volumrs of vvater run off and }vnsh lar;,+e
<br />:uuounts of silt onto the surionnding soils. (Capability
<br />unit ~'li.Ics-1 nonirrigntcd}
<br />Rough Stony Land, Shale and Tiii Materials
<br />-~ Pou,gh stony Innd, shale and till materials IRwI occurs nn
<br />the strop, hilly aides of emsionul valleys at ills soutbrrn
<br />rd~r. of Bostwick Ya,rk. The slope xan;,,~a is 10 to u0
<br />palv:ent. Some. arena{ are made up of glacial till, and
<br />some me made up of frnd ants of shale and soft sand-
<br />stone. A ntantlr, of stones and boulders coven the till.
<br />Included in mapping trrrc Cerro soils in the. glacial till
<br />nteas and Persnyo soils in the shale areas.
<br />Tltis land type is used as native rmne, It supports
<br />n fair cover of native. grass and, in some planes, n lather
<br />dense cover of sa;,ebrush. It is accessible to livestock
<br />but is only- fairly prodnrtiro of for.I„•'ie. Erosion is n
<br />slight. to moderate haznrcl. The shale areas are most
<br />liixly to eroclc. (Capability unit PIIs-3 non{,-rigntedl
<br />Rough Stony Land, 7.'ill Materials
<br />~~ Rough stony land, till materials {Ry) occupies steep and
<br />very steep, erosional valleys at the southern edb of
<br />Bostwick Part. The slope rnngr. is 29 to EO percent or
<br />more. Old glacial deposits are espused on the upper
<br />slopes. On the surface is a mantle of stones and bouldezs.
<br />Includod in mapp-tag were small areas of Cerro soils.
<br />This land type is vsecl ns native rnti;e. It supports
<br />a moderately good cover of native glass, oakbrush, and
<br />mannta?n.-mahogany, and a scattering of pinyon pine.
<br />The lower slopes are easily accessible to livestock. Ero-
<br />sion is a slight. fo moclernte hazard. {Capability trait
<br />4Tis-3 nonirrignted)
<br />Saline Wet Land
<br />Salute .vet land (sot is in Sow cotualve areas. '.Fhe tw-
<br />tura ranges from clap to sandy loam, and the color
<br />ranges from reddish brown to olive. This htnd type
<br />is poorly drained of very poorly drained. Xt. occurs
<br />Throughout the irrigated parts of the Area and has n
<br />mocleraiely large total acreage.
<br />T17esIe mm~s are poorly drained and excessively saline
<br />because of seepne and runoff from irrigated Hslcls up'
<br />slope. The Crater fable is near the surface during thQ
<br />gromtta season bttt recedrs in winter. ~Vltett dry, these
<br />areas hncc st 1- to 8-inch \rhite atust of [wcttmnluted
<br />salts, mainly ealcitml carbonate and calcium sulfate bat
<br />part]p other salts. The surface layer is impregnated with
<br />salt, is loose and flnHy when dry, and is sttbngly aggre-
<br />gated.
<br />This land type is uusuitablc for cultivation. It sui<r~
<br />ports only a sparse cover of salty and \vater-tolectnt grus`s
<br />noel sedges. (C:apability unit VIIIes-1 nonirri,~terl),
<br />Salt Lake Seties
<br />The soils of the Salt Iml:e series are deep, impperfectly
<br />clrainet] or poorly drained, and fine tortured. Thep arc
<br />grassluul soils that formed on flood plains and vrry
<br />gantip slo inA alhtvial fans iu uniform, very calcareous
<br />alluvtum ~eticed f:•om olive and grup sedimentary rook.
<br />Snits of this scric:s ure inestettsive to the Urea nn occur
<br />principally in the valley of the ITncompaltgre Rirar,
<br />south of the tot+lt of b[ontroso.
<br />;utqulnr b1ocl ytstlrlf, ce layer 7t ob15 n~c~es thick That
<br />have n ilnrh-gtny to blank, fine-(erturetl, calent'oons suli-
<br />soil tltnt is massne, nr bus peak, bloekY strnctatro. Tlhr.
<br />~nbstratnu,, trhich begins at a depth of 1.5 to ~D int:hes,
<br />ie „ray to black, calnarcons clay that is strongly rnottled
<br />++iUt brighter colorod streaks and stains. 7.'yptcally, tlla
<br />depth to bedroct: is GO inchaa or more. Strong accumula.
<br />lions of sc.Cnndnrc cnloium carbonate orrnr in rho lower
<br />anbsnil aucl substratum. '
<br />These soils me not likely to et•oclc if the}- are well
<br />mn»n„ed. The otgnnic-matter content is moderately
<br />hull, ;utcl the s[rurttiro is stable.
<br />'-l'ypicul pro&le of Salt Lake clay, 500 feet north of
<br />the southeast eoisier of the r`E?4 of sec. 8, '1'. 4ti N., It,
<br />;)1~', (1~Iontrnsc Couot_v}
<br />Ol-1 inch to o, flbrovs orgeaic mat eonMsnnC nMmnrtts of
<br />vnds+rmpoccd grnasea.
<br />All---0 tq 4 iurhes, Clay; Cray (IaXR 'u/1) when dry, blaF'k
<br />(10S1t. 2/1) when moist; strong, very fine, nnFntktr
<br />Ulgcky atruetnre; slightly hard when dry, very Ski-
<br />sUtn when moist; enicareovs; pII 5.0; ctsnr, amggtk
<br />boundary.
<br />x13-5 t0 13 Innbes. Clay: dark pray (SOSR 4/1) whrn ai'Y.
<br />black (:.5Y z/1) when moist; very wank, cunrllC,
<br />ppr,amntia strnetnre brauklag to moderate, Gne, naru-
<br />lar blocky; bard whsa dry, very Dtnstlc wheu we[;
<br />rntcarcons; D$ 5.0; clear, smooth bonnfL•Iry.
<br />d13cu-15 to ?0 inches, day: dar1.• srN- (IUYR 4/1) +vl~en
<br />dry. Muck (2.5Y EJl) when awiat; ncak, coarse,
<br />prismatic stxneture brenliag to mgderntc, mcdlam,
<br />aagalnr ,blocky; aYtromaly bnrA wbea drS• very
<br />DlaetiC wt,aII n'eL' moderate ap;amniation of aCCOlid-
<br />ary rnldtua enrlionnCe nrcarrlnt; as small crystals
<br />and in seams nncl streaks; catrnreous; pn h3; deer.
<br />etagoth bollndnry.
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