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<br />20 SOIL SURVEY
<br />blocky; hard, friable; slightly sticky and plastic; thin,
<br />patchy, clay films on vertical faces of peds; neutral;
<br />clear, smooth boundary.
<br />C--41 to 60 inches, brown (7.5YR 5/4) loam, dark brown
<br />(7.5YR 4/4) when moist; massive; slightly hard, friable;
<br />nonsticky and slightly plastic; neutral.
<br />The O horizon ranges from less than 1 inch to 3 inches in
<br />thickness. The Al horizon ranges from very dark grayish
<br />brown to very dark brown and is as much as 6 inches thick.
<br />The A2 horizon ranges from sandy loam to loam but is
<br />generally light loam. It is 3 to 6 inches thick.
<br />The B&A horizon is mostly material from the B2 horizon.
<br />it is 2 to 5 inches thick. The B21t horizon is light clay to
<br />heavy clay loam 6 to 14 inches thick. it ranges from brown
<br />to dark brown, mainly in hue of 7.5YR. The B22t horizon
<br />is brown to dark-brown light clay to heavy clay loam 9 to
<br />14 inches thick. Th¢ B3 horizon is loam to light clay loam
<br />8 to 12 inches thick. It ranges from brown to dark brown,
<br />mainly in hue of 7.5YR.
<br />Depth to the C horizon ranges from 35 to 45 inches. The
<br />C horizon is loam to gravelly sandy loam. In places it is
<br />underlain by cobbly granitic gravelly sand or by granite
<br />rock at s depth of 40 to 80 inches.
<br />LbD-Larkson loam, 6 to 12 percent slopes. This soil
<br />is on loess-thickened, east-facing dip slopes of sand-
<br />stone upland plains in the western part of the survey
<br />area. The areas are irregular in shape and cover as
<br />much as 700 acres. This soil has a profile similar to the
<br />one described as representative of the series, but there
<br />are no stones in the surface layer and no cobbles and
<br />gravel in the substratum. Also, in places, the surface
<br />layer is as much as 7 inches thick, especially in spaces
<br />between trees where the grass is more dense.
<br />Included with this soil in mapping are areas of
<br />Vamer soils and Rock outcrop that make llp about
<br />10 percent of the acreage and areas of Holderness silt
<br />loam that make up about 5 percent.
<br />Runoff is medium, and the hazard of erosion is mod-
<br />erate.
<br />This soil has high potential for timber, recreation,
<br />and wildlife habitat. The native vegetation is ponderosa
<br />pine. Capability unit IVs-3, nonirrigated; woodland
<br />group Srl; range site not assigned.
<br />LcE-Larkson stony loam, 5 fo 20 percent slopes.
<br />This soil is in the western part of the survey area. The
<br />areas are irregular in shape and cover as much as 1,000
<br />acres. This soil has the profile described as representa-
<br />tive of the series, but on alluvial fans at the foot of
<br />mountains cobbly or gravelly sandy loam is below a
<br />depth of 40 inches, and on some mountainsides granite
<br />bedrock is at a depth of 4 to 6 feet or more. Clusters
<br />of stones and boulders cover about 3 percent of the
<br />surface.
<br />Included with this soil in mapping, and making up
<br />about 15 percent of the acreage, are areas of Larkson
<br />extremely stony loam and Larkson gravelly sand on
<br />the sides of small ravines. Also included are areas of
<br />Holderness soils that make up about 5 percent.
<br />Runoff is medium, and the hazard of erosion is high.
<br />This soil has potential for recreation, wildlife habitat,
<br />and timber. The native vegetation is ponderosa pine.
<br />Capability unit VIe-5, nonirrigated; woodland group
<br />5r1; not in a range site.
<br />Las Animas Series
<br />The Las Animas series consists of deep, somewhat
<br />poorly drained soils. These soils formed on bottom lands
<br />in loamy alluvium. The slope is 0 to 2 percent, and ele-
<br />vation is 4,300 to 4,900 feet. The average annual pre-
<br />cipitation is 12 inches. The average annual temperature
<br />is 53° F, and the frost-free season is 155 to 165 days.
<br />The native vegetation is salt-tolerant grasses and
<br />woody plants.
<br />In a representative profile the surface layer, about 6
<br />inches thick, is very pale brown fine sandy loam that
<br />has yellowish-brown mottles. The subsurface layer,
<br />about 12 inches thick, is very pale brown stratified fine
<br />sand and fine sandy loam that has dark yellowish-brown
<br />and gray mottles. The underlying material is about 23
<br />inches of light brownish-gray fine sandy loam that has
<br />dark-gray mottles over dark-gray stratified silty clay,
<br />loam and fine sandy loam that extends to a depth of
<br />60 inches or more.
<br />Permeability is moderately rapid, and the available
<br />water capacity is high. These soils are moderately alka-
<br />line to strongly alkaline. Their root zone extends to a
<br />depth of 60 inches or more. Most of these soils are used
<br />for grazing. About 20 percent is used for irrigated feed
<br />crops.
<br />Representative profile of Las Animas fine sandy
<br />loam, in grass on an oxbow of the Arkansas River,
<br />about 700 feet west of the southeast corner of sec. 30,
<br />T. 21 S., R. 60 W.
<br />Al-0 to 6 inches, very pale brawn (lOYR 7/3) fine sandy
<br />loam, brown (lOYR 5/3) and has common, medium,
<br />yellowish-brown (lOYR 5/6) mottles when moist; weak,
<br />medium, granular structure; slightly hard, very fri-
<br />able; nonsticky and slightly plastic; calcareous; mod-
<br />erately alkaline; clear, smooth boundary.
<br />AC-6 to 18 inches, very pale brown (lOYR 7/3) fine sandy
<br />loam, brown (lOYR 5/3) and has common, medium,
<br />distinct, gray (LOYR 511) and dark yellowish-brown i
<br />(lOYR 4/4) mottles when moist; weak, medium, sub-
<br />angular blocky structure; slightly hard, very friable;
<br />nonsticky and slightly plastic; calcareous; moderately
<br />alkaline; clear, smooth boundary.
<br />Clg-l8 to 41 inches, light brownish-gray (lOYR 6/2) fine
<br />sandy loam, dark grayish brown (lOYR 4/2) and has
<br />common, large, faint, darK-gray (lOYR 4/1) mottles
<br />when moist; massive; slightly herd, very friable; non-
<br />sticky and slightly plastic; calcareous; moderately alka-
<br />line; clear, gradual boundary.
<br />C2g-11 to 60 inches, dark-gray (N 4/O) when moist strati-
<br />fied silty clay loam and fine sandy loam; massive; very
<br />friable sticky and slightly plastic; strongly calcareous;
<br />moderately alkaline.
<br />These soils are highly stratified but are mostly fine sandy
<br />loam. The A horizon ranges from 3 to 12 inches thick. The
<br />AC and C horizons range from moderately alkaline to
<br />strongly alkaline. In places as much as 5 percent of the AC
<br />horizon is gypsum in the form of small crystalline masses.
<br />Depth to the Cg horizon ranges from 6 to 30 inches.
<br />.This soil is on
<br />bo om ands of rivers and creeks. The areas cover as
<br />much as 500 acres.
<br />Included with this soil in mapping are areas of
<br />Bankard sand and water-deposited sand, gravel, and
<br />cobbles that make up about 20 percent of the acreage.
<br />Also included are areas of Apishapa silty clay in nar-
<br />row, shallow, meandering channels. These areas make
<br />up about 5 percent of the acreage.
<br />Runoff is slow, and the hazard of water erosion is
<br />slight. The soil is subject to frequent, brief flooding.
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