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SOILS AND VEGETATION ~nt)
<br />• Exhibit I/J
<br />Eutroboralfe
<br />EBF-Eatroboralfa, steep. This mapping unit fe in
<br />the foothills in the western part of the country. The
<br />slope le mostly 10 to 66 percent but ranges to nearly
<br />vertical rock outcrops. This mapping unit consists of
<br />steeeepp, deep, canyonlike drainageways through beds of
<br />sandstone or along escarpments formed by uptilted
<br />beds of sandstone. atones, boulders, and some soil ma-
<br />terial have accumulated on the elopes. Rock outcrop ie
<br />in places along the rime of canyons or esrsrpmente.
<br />The mapping unit is made up of about 26 to 30 percent
<br />Rock outcrop.
<br />The plant cover is ponderosa pine, pinyon pine, juni-
<br />per, shrubs, forba, and greases that provide some light
<br />grtaing. Capability unit VIIs-mil, nonirrigated; range
<br />Bite not assigned.
<br />Nunn Series
<br />The Nunn series consists of deep, well-drained soils.
<br />These soils formed on uplands in loess and loamy
<br />residuum weathered from sandstone. The elope le 0
<br />to 9 percent, and elevation la 6,800 to 8,700 feet. The
<br />average annual precipitation is ]8 Inches. The average
<br />annual temperature le 60° F, and the frost-free season
<br />1e 116 to 146 days. 'Phe native vegetation le mainly
<br />grasses of the foothllle.
<br />In a representative profile the surface layer le
<br />grayish-brown clog loam about 8 inches thick. The
<br />subsoil is brown and pale-brown clay loam and heavy
<br />clay loam about 28 Inches thick. The underlying ma-
<br />terial ie pale-brown loam that extends to a depth of
<br />80 Inches or more.
<br />Permeability le slow, and the available water
<br />capacity ie high. The surface layer le mildly alkaline,
<br />end the underlying material ie moderately alkaline. The
<br />rook zone extends to a depth of 80 inches or more.
<br />These mils are used for grazing and for dryland crops.
<br />Representative profle of Nunn clay loam, 0 to 6
<br />percenE elopes, In native grave, 100 feet east and 0.4
<br />mile north of the southwest corner of sec. 27, T. 22 i3.,
<br />R. 87 W.
<br />Al-0 to 0 Inehee, ssrayleh-brown IOYR 6/E) clay loam,
<br />very dark greyleh brown (10~R 8/2) when motet;
<br />weak, floe, granular etrvcture; allghtly herd, very ir--
<br />able; slightly sticky end plastic; nentrsl; elver, smooth
<br />Bl-8 to 0 lochee, brown (fOYR 6/8) clsy loam, dark brown
<br />(lOYR 8/8) when molar; mo erste, floe, eubangvlar
<br />blockyy etructvre• allghtly hard, irlable• sticky end
<br />plaatlc; thin pslehy, slay flime on vertleel tease of
<br />pede• neutre~ steer, smooth boundary.
<br />BEIt---9 l0 18 Ine~ea, brown (IOYR 6/8) heavy clay loam,
<br />dark brown (lOYR 9/9) when motet; moderate, medium,
<br />priemetle elructure parting to strong, medium eab-
<br />enguler blocky; very hard, firm; etleky and plaatlc;
<br />eontlnuoue, elsy flime on pede; mildly alkaline; steer,
<br />smooth boundary.
<br />B22t-IB to 28 lochee brown SIOYR 6/8) heavy clay loam,
<br />dark brown (10Y1t d/8) when motet; moderate, medium,
<br />prlemstle elructure parting to moderate, medium, sub-
<br />angulnr blocky; very hard firm; etleky end plaatlc;
<br />thin, nearly eontinvoos, clay flime an pede; mildly elke-
<br />Ilne; clear, smooth boundary.
<br />BBce-~28 to 92 Inehee, pale-brown (IOYR 8/8) clay loam,
<br />dark brown (lOYR 4/8) when moist; weak coarse
<br />eubanguler blocky etrueture; herd, friable; sticky sort
<br />plaatlc; ealcereoua; common one and medium fllamenle
<br />and soft messes of Ilme; moderately alkaline; clear,
<br />smooth boundary.
<br />C-32 to 60 Inehee pale-brown (IOYR 8/8) loam, dock
<br />brown (lOYR d18) when moist; weak, coarse, yyrismetlc
<br />etrueture; allghtly hard, verT friable; allghtly stteky
<br />end allghtly vplaetle• ekrongly eeleareous• common floc
<br />end medium fllamenle and soft messes o~ nme; mnder-
<br />ntely alkaline.
<br />The A 1 horizon le loam, stony loam, or clay loom 0 to B
<br />Inehee thlek. The H horizon 1e 18 to Ad Inehee thick. Crocks
<br />that are one-fourth Inch wide extend from the evrfnrc hd°
<br />the B horizon In lease where the Boll dries out. Sandstone
<br />la et a depth o[ d feet or more.
<br />NuD-Nunn clay loam, 6 to 9 percent slopes. This
<br />Boil is in the western pert of Pueblo County and the
<br />northeastern part of Custer County. Areas ore irreg»
<br />Isr In shape and cover as much ae 200 acres. This aoi
<br />hoe a profile similar to the one described as represents
<br />rive of the aeries.
<br />Included with this soil In mapping are areas of
<br />Travessilla soils that make up about 6 percent of the
<br />acreage.
<br />Runoff Is medium, and the hazard of erosion is
<br />Blight.
<br />This soil is used mostly for grazing. It is also used
<br />for dryland wheat and grain sorghum. it has high
<br />potential for wildlife use if the habitat can be improved.
<br />The native vegetation is mainly western wheatgrss~
<br />and blue grams. Capability unit IVs-3,. nonirrigated;
<br />Loamy Foothills range site.
<br />Penrose Series
<br />The Penrose aeries consists of shallow, somewhat
<br />excessively drained soils. These soils formed on upland
<br />hi)le and ridges in loamy residuum weathered from
<br />limestone. The slope is 1 to 86 percent, and elevation
<br />ie 4,400 to 6,200 feet. The average annual precipitation
<br />is 12 inches. The average annual temperature is 69° F,
<br />and the frost-free season to 190 to 176 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 9 inches thick.
<br />The underlying material is light-gray 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, 26 to 66
<br />percent elopes, in grass, 0.47 mile south and 0.1 mile
<br />east of the northwest corner of sec. 9, T. 2613., R. 80 W.
<br />AI-0 to 9 inches, light Drownlah-greyy (lOYR 8/2) chsnnery
<br />loam, dark greyleh brown (lOYR d/2) when moist;
<br />weak, floe, granular structure; allghtly hard friable•
<br />nonsticky and allghtly plastic; calcareous; 6b parasol
<br />of the surface le covered by Ilmeetone fragments;
<br />moderately alkaline; abrupt smooth boundary.
<br />l~8 to 12 lochee, light-gray (taYR T/2) channery loam,
<br />brown (lOYR 6/8) when motet• maseive• slightly herd,
<br />friable; allghtly sticky and ellg~tly Dlaetic; calcareous;
<br />36 percent Ilmeetone fragments; moders rely alkaline;
<br />abrupt, smooth boundary.
<br />R-12 Inches, sray, hard, Interbedded IlmaeWne, 2 to 9 Inches
<br />thick, end thin layers of msrly shale.
<br />E%CEAPT FAOM SOIL SURVEY OF PUEBLO AREA, C~rOLORADO A U.S. DEPARTMENT OF AGRICULTURE, SOIL
<br />CONSERVATION SERVICE PUBLICATION n9
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