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<br />PUEBLO AREA, COLORADO
<br />A-0 to 4 inches, light brownish-gray (lOYR 6/2) silty
<br />clay loam, dark brown (IOYR 4/3) when moist; weak,
<br />very thin, platy structure parting to weak, fine, gran-
<br />ular; soft, very friable; slightly sticky and slightly
<br />plastic; calcareous; moderately alkaline; abrupt, smooth
<br />boundary.
<br />B21t-4 to 11 inches, grayish-brown (lOYR 5/2) heavy clay
<br />loam, dark brown (lOYR 9/3) when moist; moderate,
<br />medium and fine, subangular blocky structure; slightly
<br />hard, friable; sticky and plastic; thin, patchy, clay
<br />films on peds; calcareous; moderately alkaline; clear,
<br />smooth boundary.
<br />B22[-11 to 20 inches, pale-bro~en (lOYR 6/S) heavy clay
<br />loam, brown (lOYR 5/3) when moist; moderate, medium
<br />and fine, subangular blocky structure; hard, firm; sticky
<br />and plastic; thin, very patchy, clay films on peds;
<br />calcareous; moderately alkaline; clear, smooth bound-
<br />ary.
<br />B3-20 to 34 inches, pale-brown (lOYR G/3} silty cla}•
<br />loam, brown (lOYR 5/3) when moist; weak, coarse,
<br />subangular blocky structure parting to weak, medium
<br />and fine, subangular blocky, hard, firm; sticky and
<br />plastic; calcareous; few, fine, rounded masses of crystal-
<br />line gypsum; moderately alkaline; clear, smooth
<br />boundary.
<br />Ces-39 Lo GO inches, pale-brown (]OYR 6/S) clay loam,
<br />brown (101'R 5/3) when moist; massive; slightly hard,
<br />firm; sticky and plastic; calcareous; few', fine, rounded
<br />ntasscs of crl•stalline gypsum; moderately alkaline.
<br />The A horizon is silt loam to clay loam 3 to 8 inches thick.
<br />The B2t horizon ranges from clay to silty cla}• loam 17 to
<br />32 inches thick. The lower part of the B horizon ranges
<br />from moderately alkaline to strongly alkaline, Some profiles
<br />arc as much as 15 percent gravel.
<br />11Ioll-illattzanola clay loam, 2 to 0 percent slopes.
<br />This soil is on colluvial slopes below escarpments of
<br />limestone or shale in the western part of the survey
<br />area and at the foot of mesas in the northeastern part.
<br />The areas cover as much as 400 acres. This soil has
<br />a profile similar to the mle described as representative
<br />of the series, but the surface layer is grayish brown,
<br />and the subsoil is very plastic. Also, in the nm'theastern
<br />part of the survey area the surface layer and upper
<br />part of the subsoil are as much as 15 percent gravel.
<br />Included with this soil in mapping are areas of
<br />blanvcl silt loam that make up about I5 percent of the
<br />aCi'Cage.
<br />Runoff is moderate, and the hazard of erosion is
<br />moclcratc.
<br />This soil is well suited to grazing. The native vegeta-
<br />titnl is mainly western wheatgrass, blue grama, and
<br />fourwing saltbush. The potential for improving the
<br />range cover is good. Capability unit VIe-1, nwt-
<br />irrigated; Loam}' Plains range site.
<br />I1IpA-Dlanzanola silty clay loam, 0 to 2 percent
<br />slopes. This sail is on deeply dissected fans and ter-
<br />races. The areas are irregular in shape and cover as
<br />much as 300 acres. This soil has the profile described
<br />as representative of the series.
<br />Included with this soil in mapping are areas of Haver-
<br />son silt loam and Haverson fine sandy loam that make
<br />up as much as 15 percent of the acreage.
<br />Runoff is slow, and the hazal•d of erosion is moder-
<br />ate. Gully headcutting is a hazard. The soil is subject
<br />to rare or occasional brief flooding received as nmoff
<br />from adjacent higher areas.
<br />This soil is well suited to grazing. The native vegeta-
<br />tion is mainly foul•vving saltbush, western wheatgrass,
<br />biue grama, and galleta. The potential for improving
<br />23
<br />the range cover is good. Capability emit VIvv-2, tlon-
<br />irrigated; Saline Ovel•Rovv range site.
<br />Midway Series
<br />The bIidvvay series consists of shallow, well-drained
<br />soils. These soils formed on uplands in clayey residuum
<br />that vvas derived mostly from shale. They are ]tndel•-
<br />lain by soft shale at a depth of 8 to 20 inches. The
<br />slope is 1 to 0 pel•cent, and elevatiotl is 4,400 to 5,800
<br />feet. The average annual pl•ecipitation is 12 inches.
<br />The average annual tenlperatul•e is 53° F, and the
<br />frost-free season is 145 to 175 days. The ]]alive vegeta-
<br />tion is mainly plains grasses.
<br />In a representative profile the surface layer is
<br />grayish-brown silty clay about 2 inches thick. The
<br />undel'lyillg material is light bl'ovvnish-gl•ay silty clay
<br />about 7 inches thick. Soft shale is a depth of about 0
<br />inches.
<br />Permeabilit}• is slow, and the available ivatet•
<br />capacity is very lov:. These soils are moderately alkaline
<br />to strongly alkaline. Their root zmte extends to a depth
<br />of 9 to 20 inches. They are used for grazing.
<br />Representative profile of Midway silty clay, in an
<br />area of Midway-Shale outcrop complex, 1 to 9 percent
<br />slopes, in grass, 0.45 mile east and 0.15 mile south of
<br />the northwest corner of sec. 26, T. 26 S., R. 60 1V.
<br />A-0 to 2 inches, grayish-brown (2.5Y 5/2) silty clay', dark
<br />grayish brown (2.5Y 9/2) when moist; moderate, very
<br />fine, granular structure; soft, friable; stick}• and plas-
<br />tic; moderately alkaline; abrupt, smooth boundary.
<br />Cl-2 to 9 inches, light brox•nish-Bray (2.5Y G/2) silty clay,
<br />olive brown (2.51' 4/A) when moist; massive; slightly
<br />hard, firm; sticky and plastic; calcareous; moderately
<br />alkaline; abrupt, smooth boundary.
<br />C2-0 inches, calcareous, soft shale.
<br />The soil ranges from clay' to silty clay loam. Depth to
<br />shale range; from S to 20 inches.
<br />1115D-11Iid}vay-Shale outcrop complex, 1 l0 0 percent
<br />slopes. Tllis complex is in all but the fol•estecl .pal•ts
<br />of the survey area. It is made up of about 50 percent
<br />DIidvvay silt>• clay and 40 percent Shale outcrop. Areas
<br />of this complex are irregular in shape and cover as
<br />mach as 40 acl'es.
<br />The IVlidway soil in this complex has the profile
<br />described as representative of the Ivlitlway series.
<br />Included }eith these soils in mapping are areas of
<br />Razor clay loam that make up about 10 percent of the
<br />acreage.
<br />Runoff is rapid, and the hazard of erosion is high.
<br />This Midway soil is better suited to grazing than to
<br />other uses. The native grass is mainly galleta, but
<br />alkali sacaton, western wheatgrass, and blue grama
<br />at•e common. In places the shale contains the mineral
<br />selenium, which is absw'bed by some native plants.
<br />These plants are poisonous and, if eaten in large quanti-
<br />ties, are hat•mfu] to livestock. Capability unit VIIs-1,
<br />nonirrigated; Shaly Plains range site.
<br />illinnequa Series
<br />The Ivlitlnegtta series consists of model•ately deep,
<br />well-drained soils. These soils formed on uplands in
<br />silty- residuum weathered from limestone. The slope
<br />is 1 to 3 percent, and elevation is 4,400 to 5,800 feet.
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