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<br />Reservoir, and as scattered small areas 16ruughuut. the
<br />annrtc.'1'hese areas are struugly sloping and hills. Cnsrajo
<br />soih are grla'ellc lo:uu iu texhu•e to n depth of about 15
<br />inches. 'Their slope is generalh' less than 1•~ percent. LI-
<br />cluded in mapping acere. spots of Hara'et lu:uu, on ]Wore
<br />level parts of the landscape, and spots of tironeham lo:uu,
<br />al more level parts and also in slight depressions.
<br />'These. sails take iu ac:der readil}• but have a Ion' acater-
<br />holding rapacitc. Runoff' is sloe' to nlediunl. 1'he erosion
<br />hnz:ntl is slight by nnnlea•ate.
<br />\rnte of the. acreage has ever been cultitated. <VI of it is
<br />used as range. llefermeut :uul rotation of grazing help in
<br />im)n•oring regehtfion ant) controlling erosion. (Capabilit}•
<br />and, \-IIs-1, nrntirrigated; Grater Breotks rouge site)
<br />The Colba• series consists of gently sloping, limy soils
<br />that formecj in silty, limy loess. These soils occur m all
<br />parts of the county. The largest acreages are in the eastern
<br />third.
<br />In a typical profile the surface layer is light bro]cnish-
<br />grny to grayish-broach silt loam about 6 inches thick.
<br />Belo]c this, to a depth of about 2D inches, is pale-brown silt
<br />loam. This material has eery aceak, coarse, subanguL•u'
<br />block}• structure and contains a feac achite lime spots about
<br />a antler of mt inch in diameter, The rest of the profile, to
<br />a depth of 60 inches, is light yelloacish-broach, stronglt
<br />calcareous, massia'e silt loam.
<br />Colb}• soils are nahu•a11}' aa'ell clrainerl. The}' hate slow'.
<br />to medium runoff, moderate permeabilitt, and a higl
<br />.cater-holding eapaeit.y. They are high in natural fertilir c.
<br />If cultivated or otergrnzed, the}• are susceptible to blo~
<br />ing and to water erosion.
<br />Most of the acreage is used as range. Much of it. has Lt•, ,
<br />ploaced and ch•}'farmed but. has Hoar recelded to grl.-.
<br />Large acreages hate been planted to grass.
<br />T}'pical profile of a. Colb}• silt. loam (900 feet east. of ti\1:.
<br />corner sec. ?~, T. °_R S., R. 53 R'.)
<br />.]ll-0 to 3 inches, ligLt brotcnish.gray (lOTR G/_) silt Ina m.
<br />dark grayish Lrou~n (lOTR 9/^_) vchc^ moist; sera l:.
<br />coarse, plate struchtre to scent:, &ue, granular ; s1igL[ly
<br />Lard trhen dt;v, very friable n•hen moist; nh•mlglcl
<br />Galen reons; clear, smooth Luuudnrc.
<br />.\t?-3 to ti inches, grncrsh-hrosrn (lO1R 5/'?) xilt loam, +la rl:
<br />graSish hrosrn (lOYlt 9/2) ashen moist: rerc to •a h.
<br />cna rse, suhmtgufar Dlocky structure: slight)}~ h:u~!
<br />schen rlry', rerr friable ashen moist; strouglp r:llra:
<br />ottn; dca P. smooth Luanda ry.
<br />:]C-r to Il inches, Pnle.brms'n (]OSR f/3) silt Ina ut, d,i„
<br />grayish broscu (lOYlt a%') when umist; rerc mr: J..
<br />con rse, Drismatic shvct are; slighth~ Lard acLrn dr>;
<br />s'erp friable schen moist; eery wrongly rnlrnrruus:
<br />rlm r, sn~nnih bnundn ry'.
<br />Clca-11 to "1 inches, pale~hrnmu (lU]R li/:{t silt lo;uu. brmni
<br />(10]-R 6/3) schen moist: eery sera L, vua roe, snL-
<br />:utgular Llncl:}' structtu•e: slightly' hn rd scLcn Jry.
<br />rrry frig LlC arhen uud.Y; rlra r, suumth Lnnud:u-y.:
<br />^hmd ~ pmreut white liuw spnL=.
<br />C"_ca-^_0 to IiU inrLcs, light yellnsrish~hrosvn (]UYR 1./Jt sih
<br />tow m, Lrutvt I10Y11 a/3) schen uwint: wnssico: La r41
<br />n'hrn drp, cet;r frighle schen moist: strongly ~~.~
<br />cn remu: rcca l: nccuundntinn of ca lrium ca rbmta [e.
<br />The :\ hnrizmt ra ages from 3 [n S inches in thickness
<br />from silt lunm to fine sa ndc loam in texdn•e. 1t is geur•ra:
<br />liu~r at the surfaee bat in npnts is lest shed to :t drpth of 9 c+' ~•
<br />inehen. The C horizon is uni6ttntlc nil[. loam.
<br />l'olltr soils hate less dislinrt horizons than ]\"ilec soils. Thu)'
<br />generally nre sG•mrgly calm reoun throughout the profile,
<br />acherean \\'ilrc soils ore noncak:arrmts in the A and B1 hnt'i~
<br />zoos. Colby sails ore not no rlerPlc leached au Baca soils. AWu.
<br />they lark the strong, well-defined struchn'e of tlwse snit>. Thr7
<br />ore uu a'e silt',' thou ICim sails.
<br />Colby fine sandy loam, 0 to 3 percent slopes (C6B1.-~
<br />This soil is on the uplands in the Genf rat pnt•tof the counts.
<br />mainly south of the ,\rkausns Ricer. It. Decors as irre_=
<br />ularh' shaped areas 100 acres or more in size. 'fhe. snrf;r
<br />layer is about 6 inches thick. 1'he rest. of the profile, '~
<br />a depth of 9ii inches or more, is silt loam in texture. I. -
<br />cluded iu mapping aa'ere spots of \\'iley silt. loan], al tLr
<br />leas sloping pa1•ts of the landscape; a feat areas of nearl,t
<br />level Baca soils; and spots of Colby silt loan], 6 to 0_5 per
<br />cent slopes, achich occur athere the uplands slope oil
<br />toacnrd the ch•ainageatays.
<br />This soil takes ]n aa'atcr readil}- and has :] high seater
<br />holding ca.pacit.}'. Ruuoft' is slows t.o medium, and th~
<br />hazard of seater erosion is moderate. The hazard of so11
<br />browsing is moderate to ser~e„ItyLe~~~, ;,•~tJ_tegetatitt)
<br />corer is maintained. IiL.,IV` \N/ lEJ1
<br />OCT 2 51983
<br />MINED LAND RECLAMATION D1VlSlON
<br />Colo. Dept. of Natural Resources
<br />Figure 3. Profile of Cascajo gravelly loam. Lime has accumulated
<br />on underside of gravel.
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