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DOULDER COUNTY AREA, COLORADO
<br />fhirl:. lt,.lna' this, at. n 51ept.h of ;10 inches, is shale. Lt the
<br />snrlarc lacer nn,l sulsnil, soil rcnrtinn is slightly acid,
<br />:nni in the undcrlyiu~ malcrial, it i. modarnlclc all:alinc.
<br />'i n'~•!I mils ha rr .inn' pr rn stability. :\vai L•tblc. R•;ttcr
<br />rsi~,~ ~'•: fnr thr prn!ilr Is unxlcr:dc. 1:uols c;ut pcnetrutu
<br />In^ i•,r~nli nl 'llltn.Il+itp'hrF.
<br />'1'hra• >„i i :Ira used for irrig,t[rt! lord lh•yl:unl crops :uul
<br />fnr ),:ISU n'c.
<br />]trprr,eutaticc profile. of Dutch clay lo:un, 3 to 0 percent
<br />slopes, localod _,:;10 feet cast and 400 feet north of the
<br />soot Inrrs( corner of sec. 11,'.0.1 S., It i 0 bV.:
<br />A),--0 fn Innc~s, dark grnyish-hrowo (lOYR 4/2) cloy loom,
<br />errs darlc grnyish bronco (SOYR 3/'L} e•hen moist;
<br />ara k, cow rsc, subaugulnr blocky structure [hat parts
<br />n, lundcr;,t e, wediuul, gnuullar; very hnrd, Ilnu;
<br />slichtU' acid; clear, smooth hounds ry'.
<br />lift-. L, "_~ inches, 6roo•n (lOYR 5/3) cYay, dnrl: broR'n
<br />(lo]'lt d/3) when moist; modern [e, coarse, subs ngulnr
<br />blocky structure that parts to moderate, medium,
<br />au,utnr bloclcy; estremcly hnrd, firm; thin pn tchr
<br />clay lilnts on agy,regate faces; silghtly acid; clear,
<br />smooth bounda rc.
<br />CA:1-2_ to 3U inches, light brownish-gray (2.5Y G/2) clay,
<br />grayish brotcn (^_.vY G/2) R•hen moist; mnssice; ex-
<br />trcmeb' hnrd, very firm; salsa reous; common, ^ne to
<br />rearsr, prnminont, R•hi[c (lOl'R F/'!) soft n,nsses oC
<br />lime; modern Cely niknl(ne; 6rndual, smooth tround-
<br />a ry.
<br />C?-30 inches, Fray calcareous shale.
<br />The :y. bnNzuu rouges from 6 to 12 Inches In thickness and
<br />Cann clue loam to light cloy In restore. The stn,etn re of the
<br />D. horizon range; from weak prismatic to moderate, eon rye
<br />and medium, subanglilar blocky wad blocky. Depth to shnlr.
<br />r:ulges from '!0 to ~10 inches.
<br />Finch clap loam, 3 to 9 percent scopes (KuDI.-This
<br />soil is nn the alrlauds, mainly in the south-centt:al part
<br />of the :\roa. LI most. places tt Is in areas I1101'P. (hall 20
<br />acres in sizes In solar, places scattered gravel and cobble-
<br />stuucs e re onthe ,n rfnce.
<br />Ipl•Inllcrl R'ith this soil in mapping m•e small areas of
<br />\`mul cLt}• li~:nu, 5 to !1 percent Slopes; Snntsil clay, 3 to
<br />13 prrrenl sl„I~es; Fcnohill silty tiny 1onm, 3 to D percent
<br />slopes; nml ~Ilin~~lc loam. These included soils make up
<br />abnnt lh pcrr~'nt of swell mapped area.
<br />Pmlutl' is rapid nn this soil. The erosion h'aznt•d is high.
<br />\fl of the acreage of this soil is used for irrigated and
<br />drrisn<l crops ;old fnr native pasture. (Capability' units
<br />I\'c-1, irrigated, and VIc-1, nonirrigated; tree s[titabilit_v
<br />grrngt 3)
<br />L~ ROt'tC Se'-'=CS
<br />The i,aportc series is made up of shallow, R•c)]-ch~aincd
<br />soils. Thcsc ,oils formed on upland ridges in loamy resid-
<br />;unn dericed from limestone and limy shale. Slopes ore
<br />:~ to 3n pc•rrcra.. 1?Icvntions ore 5,200 to 5,R00. The native
<br />vc_cr.uinu is mainly short and mid gt:isscs, AmR4f9d prc-
<br />ri•,i!sunn is ]° l0 1'; inches. \Ican amlunl air temperature
<br />is -?S° l+, as° P., :uul the frost-free sensmt is about 140 to
<br />1:,;, ~ ;, es.
<br />lil a rcpresentativc profile the snrface laver is strongly
<br />ealt•;,r~•,nl<, garish-hrotvn very fine scolds ]oast about 8
<br />ir.r~':rti Illi,'k. 'I•hc undcrlving material is strongly cal-
<br />rtl'cr,•.s. I~:I!c-hr„R•u In;un,~about 5 inches t.hicF., that over-
<br />li,•s iuii,.r•„uc• ~uil ro:u•tion rs ntodet:daly alhalinc.
<br />l,:~l,~~rtc soils lace wodct;tto pcrnlcubility. Available
<br />I :)
<br />lvntcr capIacity for the profile is ]ntv. Rootg can penetr:cte
<br />to n ch;ptll of l,ct R'ccn l0 to 20 nlGltcS.
<br />'1.'hcsc soils :u•c ustd :vainly fnr posture or ran;;t;, but.
<br />in some wrens the undcrlving lintestonc. is usa.i for tha
<br />mn nn fact a ro. n f cculout•.
<br />IiepresrnLd,ive pruli!r, of Lapnrlo er,rv line s;uxly lor,•^
<br />5 to 20 percent. slopes, k,cale[l 1,`t20 '.:..~, tcest ;Ind L;>8'1
<br />feet north of the suutheasL corner of sec. 1(i, '1'.:; `., _;.
<br />i0 tiV.:
<br />A1--0 to 8 inch^s, grayish-bron•n (lOYR ;/2) very fmc sandy
<br />loam, very dntlc grnyish bronco (lOlit .'./33 when
<br />moist; weak, mediwn, sttbn nular blocky struc•wrc
<br />that ports to +venL-, fine, granular: soft, cen• fr.nble;
<br />strongly calm reous: moderately alknllne(clear, teary
<br />Loundary,
<br />Get to 13 inches, pale-broR'n (101'R C/3) loom, brown (]OYR
<br />/3) R•hen moist; +vcak, medium, subnngular blocky
<br />structure; soft, trio ble; strongly calcareous; moder-
<br />ntelS alkaline; clear, wavy' boundary.
<br />R-13 to 20 inches, bray limestone.
<br />The A horizon ranges from G to 10 inches in thickness and
<br />Cmrn veq• fine sandy Jnam to loam iu texture. Depths U limo
<br />stone ranges from 30 to 20 Inches. These soils arc [ypica S^
<br />cnlcnreoas, but in some places ore leashed in the upper few
<br />inches. From 0 to lu percent of the soli um [trial is limestone
<br />CI1lp4.
<br />Laporte very Sae sane?y loam, 5 to 20 percent s'.opes
<br />ILoEI•-This soil is at tops and sides of ridges in the north-
<br />lcestcrn part of t.hc Area. L) most places it occurs as tong,
<br />nm•roty m•cas mm's than 75 acres in srze.
<br />Included lvith this soil in mapping are some sm;al Wrens
<br />of Manvcl loam and near ridgctops, areas of :cock out-
<br />crop only a feR' feet R'icle. Also included is a.Laporte-lilcc
<br />soil that has limestone nt. depths bcloR' 20 to ,}0 inches,
<br />These inchuled soils :Ind Rock outcrop make up about 15
<br />percent. of enc.h mapped area.
<br />Runoff is medium to t:lpid wt this soil. The erosion
<br />hazard is high. Available R'atCl' CapaClt}' Is ]ott• bcoause
<br />of the depth to limestone.
<br />This sail is too shallow to Le cultit•nted. Almost. all of
<br />the acreage i.c in rmlge or posture. (Cnpabi]ity unit \- Ie-;,
<br />nonirrign[ed ; ta•cc suitability group 6)
<br />Longmont Scl•zes
<br />The Longmont series is made up of deep, poodt•
<br />drained, salty and all:nline soils. These soils formed on
<br />terraces and upland sR•nles in clayey allncinm dericed,
<br />from shale. Slopes aro 0 to 3 percent. Elevations are
<br />4,000 to 5,500 feet. The native vegetation is mainlc- all:..^.ii
<br />sacaton and inland saltgrass. Annual precipitation is 12
<br />to ]8 inches. D4c;ut annual air tempea•aturc is 46° to 52°
<br />I'., and the frost. free season is about 1.30 to 155 days.
<br />In n rcln•esentat.ivc proSlr, the surface layer is calcar-
<br />coas, light hrou•nislrgrat• and light uli>•r-brotcn rLly abort.
<br />21 inches thick. The undcrlving material is calc•^.reous,
<br />]i~~ht olive-brown and pale-olit'c clay to n dcptit of GO
<br />inches or more. This material is mottled :uul bss gypsum
<br />sogregations. Soil reaction in the surf:Rr laver is s;:'on_1}-
<br />alkalinc, and in the oath+rlving nultori;a it :s modrrntcly
<br />a11C11111C.
<br />Longmont soils have slots pernlcabilits. _1t.ailnble Rater
<br />capacity for the profile. is II1~ll, IinOt$ call penor.'ate `n a '
<br />depth of 60 innc~s m• uun•r and the. seasonal lr_': +, ' ••
<br />table is bettcecn a depth of ? and t feet.
<br />~.. n, ~• ~ ~ aAh~loawa/,eaatii:RRYo,i~S,niatiFax4i:l:c_.«.~.~....i~.F:,~.s__-.....
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