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<br />PUEBLO AREA, COLORADO
<br />The areas are elongated and cover as much as 300
<br />acres. This soil has a profile similar to the one described
<br />as 1epresentative of the sel•ies, but the surface and sub-
<br />surface layers are fine sandy loam and in most places
<br />limy gravelly sand is at a depth of about 5 feet.
<br />Included with this soil in mapping are areas of Otero
<br />and Manuel soils. Each of these soils makes up about
<br />10 pel•cent of the acreage.
<br />Runoff is slow. The hazard of erosion is slight in irri-
<br />gated areas and moderate in nonirrigated areas.
<br />This soil is well suited to vegetable gat•dens and irri-
<br />gated crops. The native grasses are mainly blue grama
<br />and sand dropseed. Capability units I, irrigated, VIe-1,
<br />nonil•1•igated; Loamy Plains range site.
<br />LaPorte Series
<br />The LaPorte set•ies consists of shallow, well-drained
<br />soils. These soils formed on upland hills and ridges in
<br />loamy residuum that derived from limestone. The slope
<br />is 3 to 25 percent, and elevation is 6,200 to 7,000 feet.
<br />The avel•age annual precipitation is 16 inches. The aver-
<br />age annual temperature is 48° F, and the frost-free
<br />season is 125 to 145 days. The native vegetation is
<br />mainly foothill grasses.
<br />In a representative pl•ofile the surface layer is
<br />grayish-brown channel•y loam about 7 inches thick. The
<br />subsurface layer is light brownish-gray loam about 6
<br />inches thick. The underlying material is very pale
<br />brown channel•y loam about 4 inches thick. Below that
<br />is argillaceous limestone.
<br />Permeability is moderate, and the available water
<br />capacity is very low. These soils are moderately alka-
<br />line. Their root zone extends to a depth of 10 to 20
<br />inches. They are used for grazing.
<br />Representative profile of LaPorte channel•y loam, 3
<br />to 25 percent slopes, in native grass, 0.1 mile }vest and
<br />300 feet north of the southeast corner of sec. 36, T.
<br />24 S., R. 67 R'.
<br />Al-0 to 7 inches, grayish-brown (lOYR 5/2) channery
<br />loam, very dark grayish brown (lOYR 3/2) when moist;
<br />weak, fine, granular; slightly hard, friable; nonsticky
<br />and slightly plastic; 25 percent small limestone frag-
<br />ments; calcareous; moderately niknline; clear, smooth
<br />boundary.
<br />AC-7 to 13 inches, light brownish-gray (lOYR 6/2) loam,
<br />dark grayish brown (lOYR 9/2) when moist; weak,
<br />medium, subangular blocky structure; slightly hard,
<br />friable; nonsticky and slightly plastic; calcareous; 10
<br />percent small limestone fragments; moderately; alka-
<br />line; clear, smooth boundary.
<br />Cca-13 to 17 inches, very pale brown (lOYR 7/3) channery
<br />loam, brown (10]'R 5/3) when moist; massive; hard,
<br />friable; nonsticky and slightly plastic; calcareous; 25
<br />to 35 percent small limestone fragments; moderately
<br />alkaline; gradual, wavy boundary.
<br />R-17 inches, argillaceous limestone.
<br />Content of rock fragments ranges from 10 to 35 percent.
<br />Depth to bedrock ranges from 30 to 20 inches.
<br />LaE-LaPorte channery loam, 3 to 25 percent slopes.
<br />This soil is in the southwestern pal•t of the survey area.
<br />The areas are long, narrow, and il•regular in shape and
<br />cover as much as 600 acres.
<br />Included with this soil in mapping are areas of Pen-
<br />rose soils and Rock outcrop that make up about 20
<br />pet•cent of the acreage. Also included are small areas
<br />19
<br />of Denver and Table Mountain soils that make up
<br />about 5 percent.
<br />Runoff is 1•apid, and the hazard of erosion is high.
<br />This soil has potential for wildlife use if the habitat
<br />can be improved. The native vegetation is Indian rice-
<br />grass, neecileandthlead, junegl•ass, blue grama, moun-
<br />tainmahogany, and Gambel oak. Capability unit VIIs-3,
<br />nonil•rigated; Shallow Foothills range site.
<br />Larkson Series
<br />The Larkson series consists of deep, well-drained
<br />soils. These soils fol•med on upland fans, hills, and
<br />slopes in loess and loamy residuum weathered from
<br />sandstone. The slope is 5 to 20 percent, and elevation
<br />is 6,500 to 7,800 feet. The average annual precipitation
<br />is 18 inches. The average annual temperature is 43° F,
<br />and the fl•ost-free season is 100 to 130 clays. The native
<br />vegetation is mainly forest plants of the lower moun-
<br />tains.
<br />In a representative profile the surface layer is dark
<br />grayish-brown stony loam about 2 inches thick. The
<br />subsurface layer is grayish-brown stony loam about
<br />3 inches thick. The subsoil is brown clay loam about
<br />36 inches thick. The underlying material is brown loam
<br />that extends to a depth of 60 inches ot• mol•e.
<br />Permeability is slow, and the available water ca-
<br />pacity is high. The surface and subsurface layers are
<br />slightly acid, and the subsoil and underlying material
<br />are neutl•al. The loot zone extends to a depth of more
<br />than 60 inches. These soils are used for grazing, feed
<br />crops, and wood products.
<br />Representative profile of Larkson stony loam, 6 to
<br />20 percent slopes, in native forest, 1,760 feet south and
<br />440 feet east of the northwest corner of sec. 6, T. 25
<br />S., R. 67 ~V.
<br />Ol-1 inch to 0, organic mat of needles, twigs, and pine
<br />cones.
<br />Al-0 to 2 inches, dark grayish-brown (lOYR 4/2) stony
<br />loam, very dark bro+an (lOYR 2/2) when moist; weak,
<br />thin, platy structure parting to weak, fine, granular;
<br />soft, very friable; nonsticky and slightly plastic; neu-
<br />tral; clear, smooth boundary.
<br />A2-2 to 5 inches, grayish-brown (lOYR 5/2) stony loam,
<br />very dank grayish brown (lOYR 312) when moist; very
<br />weak, medium and fine, subangular blocky structure;
<br />slightly hard, very friable; nonsticky and slightly plas-
<br />tic; slightly acid; clear, smooth boundary.
<br />BB:A-5 to 8 inches, variegated brown (lOYR 4/3) and light
<br />brownish-gray (lOYR ti/2) clay loam, very dark grayish
<br />bro+vn (10 ]'P. 3/3) and dark brown (101"B 3/2) when
<br />moist; weak, medium, prismatic structure patting to
<br />weak, medium, subangular blocky; hard, friable;
<br />slightly sticky and plastic; thin, patchy, clay films on
<br />pads; neutral; clear, smooth boundary.
<br />B21t-8 to 18 inches, brown (7.5YR 5/4) heavy clay loam,
<br />dark brown (7.5YR 4/4) when moist; moderate, medium
<br />and fine, prismatic structure parting to moderate to
<br />strong, medium and fine, subangular blocky; very hard,
<br />firm; slightly sticky and plastic; thin, continuous, clay
<br />films on pads; neutral; cleat, smooth boundary.
<br />B22t-18 to 30 inches, brown (7.5YR 5/4) heavy clay loam,
<br />dark brown (7.5YR 4/4) when moist; moderate, medium,
<br />prismatic structure parting to moderate, medium, sub-
<br />angular blocky; very hard, firm; slightly sticky and
<br />plastic; thin, nearly continuous, clay films on pads;
<br />neutral; clear, smooth boundary.
<br />B3-30 to 41 inches, brawn (7.SYR 5/4) light clay loam,
<br />dark brown (7.5YR 4/4) when moist; weak, coarse,
<br />prismatic structure parting to weak, coarse, subangular
<br />B-5
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