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PUEBLO AREA, COLORADO
<br />about 4 inches thick. Below that is very pale silt loam
<br />that extends to a depth of 60 inches or more.
<br />Permeability is slow, and the available water capac-
<br />ity is high. The surface layer and upper part of the
<br />subsoil are mildly alkaline, and the lower part of the
<br />subsoil and the underlying material are moderately
<br />alkaline. The root zone extends to a depth of more
<br />than 60 inches. These soils are used for grazing.
<br />Representative profile of Adena loam, in an area of
<br />Adena-Manvel loams, in native grass, 0.3 mile south
<br />and 200 feet west of the northeast corner of sec. 25,
<br />T. 19 S., R. 64 W.
<br />Al-0 to 3 inches, light brownish-gray (lOYR 6/2) loam,
<br />dark grayish brown (lOYR 9/2) when moist; weak, thin,
<br />platy structure; slightly hard, very friable; slightly
<br />sticky and slightly plastic; mildly alkaline; abrupt,
<br />smooth boundary.
<br />B2t-3 to 8 inches, brown (lOYR 5/3) clay loam, dark brown
<br />(lOYR 4/3) when moist; medium, prismatic structure
<br />parting to moderate, fine, angular blocky; very hard,
<br />firm; sticky and plastic; continuous, clay films on peds;
<br />mildly alkaline; clear, smooth boundary.
<br />Baca-8 to 12 inches, pale-brown (lOYR 6/3) silty clay loam,
<br />dark brown (lOYR 4/3) when moist; weak, medium,
<br />prismatic structure parting to moderate, fine, sub-
<br />angular blocky; hard, very friable; sticky and plastic;
<br />patchy, clay films on peds; calcareous; medium soft
<br />masses of lime; moderately alkaline; clear, wavy bound-
<br />ary.
<br />Clca-12 to 22 inches, very pale brown (lOYR 7/3) silt
<br />loam, brown (lOYR 6/3) when moist; weak, medium,
<br />prismatic structure parting to weak, medium, subangular
<br />blocky; hard, very friable; slightly sticky and slightly
<br />plastic; calcareous; medium soft masses of lime; mod-
<br />erately alkaline; gradual, smooth boundary.
<br />C2-22 to 48 inches, very pale brown (lOYR 7/3) silt loam,
<br />brown (lOYR 5/3) when moist; weak, medium, pris-
<br />matic structure; hard, very friable; slightly sticky and
<br />slightly plastic; calcareous; moderately alkaline; clear,
<br />smooth boundary.
<br />C3-48 to 60 inches, very pale brown (lOYR 7/4) silt loam,
<br />yellowish brown (lOYR 5/9) when moist; massive; hard,
<br />very friable; slightly sticky and slightly plastic; cal-
<br />careous; moderately alkaline.
<br />The A horizon is silt loam, loam, or fine sandy loam 3 to
<br />6 inches thick. The B2t horizon is clay loam or silty clay
<br />loam 2 to 6 inches thick. The Baca horizon is at a depth of
<br />9 to 15 inches.
<br />Am-Adena-Manvel roams. This complex is in the
<br />northern part of the survey are2.. It is made up of
<br />about 60 percent Adena loam and 30 percent Manvel
<br />loam. The slope is 0 to 3 percent. Areas of this complex
<br />are irregular in shape and cover as much as 2,500
<br />acres. Small pebbles are on the surface, and about 25
<br />percent of the surface area of the Adena soil is small
<br />slickspots. The Adena soil is level, and the Manvel
<br />soil is slightly convex.
<br />The Adena soil in this complex has the profile
<br />described as representative of the Adena series. The
<br />Manvel soil has a profile similar to the one described
<br />as representative of the Mam~el series, but the surface
<br />layer is loam.
<br />Included with these soils in mapping are areas of
<br />soils that are similar to this Adena soil, but the subsoil
<br />is about twice as thick. These included soils make up
<br />about 10 percent of the acreage.
<br />Runoff is medium, and the hazard of erosion is
<br />moderate.
<br />This complex is suited to grazing and has high po-
<br />tential for wildlife use if the habitat can he improved.
<br />The native vegetation is mainly blue grama and galleta.
<br />Cane cactus is abundant in places. Capability unit
<br />VIe-1, nonirrigated; Loamy Plains range site.
<br />Apishapa Series
<br />The Apishapa series consists of deep, somewhat
<br />poorly drained soils. These soils formed on flood plains
<br />in clayey alluvium. The slope is 0 to 2 percent, and
<br />elevation is 4,300 to 4,800 feet. The average annual
<br />precipitation is 12 inches. The average annual tem-
<br />perature is about 53° F, and the frost-free season is
<br />145 to 175 days. The native vegetation is mainly salt-
<br />tolerant grasses.
<br />In a representative profile the surface Iayeris gray-
<br />ish-blown silty clay about 8 inches thick. The upper
<br />part of the underlying material is grayish-brown silty
<br />clay about 5 inches thick, the next 16 inches is grayish-
<br />brown clay, and the lower part is light brownish-gray
<br />clay that extends to a depth of 60 inches or more.
<br />Permeability is slow, and the available water capac-
<br />ity is high. The surface and subsurface layers are
<br />moderately alkaline, and the underlying material is
<br />strongly alkaline. The root zone extends to a depth
<br />of 60 inches or more. These soils are used for irrigated
<br />crops and hay and for irrigated or nonirrigated
<br />pasture.
<br />Representative profile of Apishapa silty clay, in
<br />irrigated pasture, 0.44 mile south and 300 feet west
<br />of the northeast corner of sec. 8, T. 21 S., R. 61 W.
<br />Al-0 to 8 inches, grayish-brown (lOYR 5/2) silty clay, dark
<br />grayish brown (lOYR 4/2) when moist; weak, coarse,
<br />granular structure.; hard, firm; slightly sticky and plas-
<br />tic; calcareous; moderately alkaline; nbrupt, smooth
<br />boundary.
<br />Clcs-8 to 13 inches, grayish-brown (2.5Y 5/2) silty clay,
<br />dark grayish brown (2.5Y 4/2) moist; weak to moder-
<br />ate, fine, subangular blocky structure; hard, firm;
<br />slightly sticky and plastic; calcareous; few, fine, soft
<br />masses of crystalline gypsum; moderately alkaline;
<br />clear, smooth boundary.
<br />C2cacsg-13 to 29 inches, grayish-brown (2.5Y 6/2) clay,
<br />dark grayish brown (2.5Y 4/2) when moist; few, faint,
<br />gray (2.SY 5/1) mottles; massive; hard, firm; sticky
<br />and very plastic; calcareous; moderately alkaline; grad-
<br />ual, smooth boundary.
<br />C3g-29 to 60 inches, tight brownish-gray (2.5Y 6/2), dark
<br />grayish brown (2.5Y 9/2) when moist; common, fine,
<br />distinct, dark-gray (N 4/0) mottles; massive; hard,
<br />firm; sticky and very plastic; calcareous; strongly
<br />alkaline.
<br />Cracks as much as one-half inch wide form when the soil
<br />dries out. The A horizon is silty clay loam or silty clay
<br />4 to 8 inches thick. The C horizon is clay or silty clay.
<br />In places it has thin strata of sand, and in places wet sand
<br />is below a depth of 3~,z feet. Gray mottles are at a depth of
<br />12 to 20 inches.
<br />Ap-Apishapa silty clay. This soil is mainly on flood
<br />plains of the Arkansas River. The areas are irregularly
<br />shaped and cover as much as 600 acres. This soil has
<br />the profile described as representative of the series,
<br />but in places 3 or 4 inches of fine sand is on the surface.
<br />Included with this soil in mapping are areas of
<br />Glenberg fine sandy loam and Haverson fine sandy
<br />loam. These areas make up less than 10 percent of the
<br />acreage.
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