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LARIM~UNTY AREA, COI41tAD0 ~ 28
<br />9/3) moist; moderate coarse subangular
<br />blocky structure; very hard, friable;
<br />thin nearly continuous clay films on ped
<br />faces; mildly alkaline; clear wavy
<br />boundary.
<br />R1ca-17 to 21 inches; light yellowish brown
<br />(lOYR 6/4) loam, yellowish brown
<br />(lOYR b/4) moist; weak coarse suban-
<br />gular blocky structure; slightly hard,
<br />very friable; few thin patchy clay films
<br />on ped faces; violently effervescent; cal-
<br />cium carbonate as soft nodules; moder-
<br />ately alkaline; clear wavy boundary.
<br />'Ica-31 to 31 inches; light yellowish brown
<br />IlOYR 6/4} loam, dark yellowlah brown
<br />(lOYR 4/4) moist; massive; slightly
<br />hard, very friable; violently efferves-
<br />cent; calcium carbonate as soft nodules;
<br />moderately alkaline; clear smooth
<br />boundary.
<br />~_'-.11 to GO incliea; yellowlah brown (lOYR 5/4)
<br />loam, dark yellowish brown (lOYR 4/4)
<br />moist; massive; hard, friable; strongly
<br />effervescent; moderately alkaline.
<br />The solum tinges from 15 to 30 inches in thickness.
<br />rn.;t,on ranges from neutral to moderately alkaline.
<br />'•e :t horizon is loam or light clay loam 3 to 9 inches
<br />•~ -:. The B3 horizon is heavy loam or light clay loam.
<br />••~°.itic material is below a depth of 40 inches in some
<br />•^Sla.
<br />11-Frrnuf loam, 2 to 10 ~ereent slopes. This nearly
<br />~.•' t., strongly sloping soil is in valley fills and on side
<br />;~s.This soil has the profile described as represen-
<br />•.r. •:r of the series.
<br />I-•;lurled with this soil in mapping are some small
<br />,••.~..,f hock outcrop and small areas of soils that are
<br />^.'ar t.. Farnuf soil but in which granite bedrock is
<br />,' ~ •hpth of less than 90 inches.
<br />n•in°tT is moderate, and the hazard of erosion is
<br />- ~.i. rate.
<br />= .:oil is suited to pasture and native grasses.
<br />',>,,!,ility unit VIe-6, dryland; Loamy Park rungs
<br />,. •.: r.~~t :,signed to a windbreak suitability group.
<br />3:.F'°rnuf•Bol~le•Rock outcrop complex, 10 to 25
<br />trtrnt ~lopr~. This moderately steep soil is on ridges
<br />. : •.:,Ilry~idcs. It is about 40 percent Farnuf loam,
<br />,.. ! ~,,, l,ercent Boyle gravelly sandy loam, and about
<br />;•rcr•nt Rock outcrop. Farnuf loam is tower and
<br />- ., m•arh• level, $oyle gravelly sandy loam is higher
<br />,•! ~o ri,lges, :tnrl Rock outcrop is commonly steeper
<br />:< <r;,ttered throughout. The Farnuf soil has a pro-
<br />' • ~.mil:,r to tl:e one described as representative of
<br />••• F•trnuf series, but the combined thickness of the
<br />:•'.,°e layer and subsoil is about 18 inches. The Boyle
<br />gas a profile similar to the one described as rep-
<br />±++~taticc of the Boyle aeries.
<br />1^rluded with this complex in mapping is about 10
<br />vrnnt areas of Breese soils and areas of soils that are
<br />-,L~r to Farnuf soil but in which granite bedrock is
<br />t' a depth of Icss than 40 inches.
<br />P.annR is rapid, and the hazard of erosion is severe.
<br />This .nil is suited to native grasses. It is also used
<br />!~r +,ilAlife habitat. Capability unit VIe-b, dryland;
<br />F,^uf soil in Loamy Park range site, Boyle soil in
<br />Rocky Loam range site, and Rock outcrop not assigned
<br />to a range site; not assigned to a windbreak suitability
<br />group.
<br />Fluvaquents, Nearly Level
<br />33-F7uvaquents, nearly level. This soil is on flood
<br />plains, low terraces, and bottom ]ands. The surface
<br />and underlying layers are extremely variable, range
<br />from sandy loam to clay loam, and are commonly
<br />stratified with thin layers of sand or clay. In places
<br />the underlying material is sand and gravel. A water
<br />table is commonly at a depth of leas than 12 inches at
<br />some time during spring and summer, and the soil is
<br />also flooded occasionally during spring and summer.
<br />Drainage is impractical or impossible because of a
<br />lack of suitable outlets.
<br />Runoff ie alight. The hazard of erosion is slight,
<br />although there to some cutting on areas near stream
<br />channels in places.
<br />This soil is suited to pasture or native grasses. A
<br />few areas are used for hay. Capability unit Vw-1, dry-
<br />land; Wet Meadow range site; windbreak suitability
<br />group b.
<br />Fort Collins Series
<br />The Fort Collins series consists of deep, well drained
<br />soils that Yormed in alluvium. These soils are on ter-
<br />races and fans. Elevation ranges from 4,800 to 6,500
<br />feet. Slopes are 0 to 9 percent. The native vegetation
<br />is mainly blue grams and western wheatgrass and
<br />some fortis and shrubs. Mean annual precipitation
<br />ranges from 13 to 15 inches, mean annual air tem-
<br />perature ranges from 98° to 50° F, and the frost-free
<br />season ranges from 135 to 150 days.
<br />In a representative profile the surface layer is light
<br />brownish gray loam about 5 inches thick. The subsoil
<br />is light brownish gray, brown, and pale brown loam
<br />about 19 inches thick. The underlying matsrtal is pale
<br />brown loam.
<br />Permeability is moderate, and the available water
<br />capacity is high. Reaction is neutral above a depth of
<br />about 8 inches, mildly alkaline between depths of 8
<br />and 18 inches, and moderately alkaline below a depth
<br />of 18 inches.
<br />These soils are used for irrigated and dryfarmed
<br />crops and pasture.
<br />Representative profile of Fort Collins loam, 0 to 1
<br />percent slopes, in native grass, approximately 1 block
<br />north of LaPorte Avenue on North Shields Street and
<br />500 feet west of North Shtelds Street In sec. 11, T. 7
<br />N., R. 69 W.:
<br />Al-0 to 6 inches; light brownish gray (lOYR
<br />6/2) loam, dark grayish brown (lOYR
<br />4/2) moist; moderate fine granular
<br />structure; soft, very friable; noncalcare-
<br />ous; neutral; clear smooth boundary.
<br />Bl-5 to 8 inches, light brownish gray (lOYR
<br />6/2) loam, dark grayish brown (lOYR
<br />4/2) moist; moderate fine subangular
<br />blocky structure parting to fine granu-
<br />lar; hard, very friable; few patchy clay
<br />
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