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• ~ PUEBLO AREA, COLORADO 29
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<br />This soil is used exclusively for such irrigated crops
<br />as corn, sorghum, alfalfa, and pasture. Capability unit
<br />IIe-1, irrigated; not in a range site.
<br />Penrose Series
<br />The Penrose aeries coneista of shallow, somewhat
<br />excessively drained soils. These soils formed on upland
<br />hills and ridges in loamy residuum weathered from
<br />limestone. The slope is 1 to 65 percent, and elevation
<br />is 4,400 to 6,200 feet. The average annual precipitation
<br />is 12 inches. The average annual temperature is 53° F,
<br />and the frost-free season is 130 to 175 days. The native
<br />vegetation is mainly short and mid grasses of the
<br />plains.
<br />In a representative profile the surface layer is light
<br />brownish-gray channery loam about 3 inches thick.
<br />The underlying material is lighbgray channery loam
<br />about 9 inches thick. Gray, hard, interbedded limestone
<br />and many shale is at a depth of 12 inches.
<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 almost exclusively for grazing.
<br />Representative profile of Penrose channery loam,
<br />in an area'of Penrose-Rock outcrop complex, 25 to 65
<br />percent slopes, in grass, 0.47 mile south and 0.1 mile
<br />east of the northwest corner of sec. 9, T. 26 S., R. 60 W.
<br />Al-0 to S inches, light brownish-gray (lOYR 6/2) channery
<br />loam, dark grayish brawn (lOYR 4/2) when moist;
<br />weak, fine, granular structure; slightly hard, friable;
<br />nonsticky and slightly plastic; calcareous; 50 percent
<br />of the surface is covered by limestone fragments;
<br />moderately alkaline; abrupt, smooth boundary.
<br />C-3 to 12 inches, light-gray (lOYR 7/2) channery loam,
<br />brown (lOYR 6/3) when moist massive; slightly hard,
<br />friable; slightly sticky and slightly plastic; calcareous;
<br />36 percent limestone fragments; moderately alkaline;
<br />abrupt, smooth boundary.
<br />R-12 inches, gray, hard, interbedded limestone, 2 to S inches
<br />thick, and thin layers of many shale.
<br />In places the Al horizon is free of lime. channery and
<br />flaggy Pieces of limestone that are ;§ inch to 8 inches in
<br />diameter make up 16 to S5 percent of the soil. Bedrock
<br />is at a depth of 30 to 20 inches.
<br />PmE-Penrose-Minnequa complex, 1 to 15 percent
<br />slopes. This complex is in all but the northeastern and
<br />western parts of the survey area. It is made up of
<br />about 60 percent Penrose channery loam, and the rest
<br />is equal parts of Manuel silt loam and Minnequa loam.
<br />Areas of this complex are irregularly shaped and cover
<br />as much as 800 acres. The Minnequa and Manuel soils
<br />are on the more level areas at the low end of the eloping
<br />Penrose soils.
<br />The Penrose, Minnequa, and Manuel soils in this
<br />complex have the profile described as representative of
<br />their aeries.
<br />Included with these soils in mapping are areas of
<br />Rock outcrop that make up about 10 percent of the
<br />acreage.
<br />Runoff is rapid, and the hazard of erosion is slight.
<br />This complex is better suited to grazing and wildlife
<br />habitat than to other uses. The native vegetation is
<br />mainly blue grams, sideoats grams, New Mexico
<br />needlegrass, Indian ricegrass, yucca, Bigelow sage-
<br />brush, and same pinyon pine, juniper, akunkbush, and
<br />mountainmahogany. Capability unit VIIs~, nonirri-
<br />gated; Penrose soil in Limestone Breaks range site;
<br />Manve] and Minnequa soils in Loamy Plains range site.
<br />PrF-Penrose-Rock outcrop complex, 25 to 65 per-
<br />cent slopes This complex is in all but the northeastern
<br />snd western parts of the survey area. It is made up of
<br />about 50 percent Penrose channery loam and 30 percent
<br />Rock outcrop of limestone and interbedded shale. Areas
<br />of this complex are long, narrow, and irregularly
<br />shaped and cover as much as 800 acres. Geologic ero-
<br />lion has cut steep V-shaped gullies into the limestone
<br />and shale.
<br />The Penrose soil in this complex has the profile de-
<br />scribed as representative of the Penrose series.
<br />Included in mapping are areas of Razor, Manuel, and
<br />Shingle soils that make up about 20 percent of the
<br />acreage.
<br />Runoff is rapid, and the hazard of erosion is alight.
<br />This complex is suited to wildlife habitat. Some areas
<br />are used for grazing. The native vegetation is mainly
<br />blue grams, side-oats grams, New Mexico needle-
<br />grass, Indian ricegrass, yucca, Bigelow sage, and some
<br />pinyon pine, juniper, slcunkbush, and mountainmahog-
<br />any. Capability unit VIIs~, nonirrigated; Penrose
<br />soil in Limestone Breaks range site; Rock outcrop
<br />not in a range site.
<br />Pinata Series
<br />The Pinata series consists of deep, well-drained
<br />soils. These soils formed on mountainsides in very
<br />stony colluvivm and clayey residuum weathered mostly
<br />from sandstone. The slope is 25 to 65 percent, and
<br />elevation is 6,400 to 7,200 feet. The average annual
<br />precipitation is 20 inches. The average annual tempera-
<br />ture is 45° F, and the frost-free season is 90 to 126
<br />days. The native vegetation is mainly ponderosa pine
<br />forest.
<br />In a representative profile the surface layer is gray
<br />very stony loam about 8 inches thick. The subsurface
<br />layer is gray very stony loam and reddish-brown very
<br />stony clay loam about 4 inches thick. The upper part
<br />of the subsoil is reddish-brown very stony clay about
<br />27 inches thick, and the lower part, extending to a
<br />depth of 60 inches, is reddish-brown very stony clay
<br />loam.
<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 is neutral. The root zone
<br />extends to a depth of more than 60 inches. These soils
<br />are used for grazing.
<br />Representative profile of Pinata very stony loam, in
<br />an area of Pinata-Wetmore association, in native
<br />forest, 0.2 mile north of the south quarter corner of
<br />see. 22, T. 21 S., R. 69 W.
<br />02-2 i hea to 0, slightly decomposed grass, leaves, pine
<br />needles, and pine cones.
<br />A2-0 to 6 inches, gray (IOYR 5/1) Yery stony loam, very
<br />dark gray (lOYR 3/1) when moist; weak, roaree, crumb
<br />structure; slightly hard, very friable; slightly sticky
<br />and slightly plastic; about ZO percent rock fragments,
<br />of which half are larger than 3 inches; slightly acid;
<br />clear, wavy boundary.
<br />B&A~ to 12 inches, A pert of horizon is gray (lOYA 6/1)
<br />very stony loam that has weak, very fine, emmb atruc-
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