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Exhi~t B - Slte ITescription
<br />LARIMRR COUNTY AREA, COLORADO
<br />Capability unit VI:~-3, dryland; Shallow Foothill range
<br />site; not assigned to a windbreak suitability group.
<br />SG-Purner~~, ~ntrro(~,~om ~sy 10
<br />5cnt~alo c~a. T is complex consis s o mo~c crate y steep
<br />o ei"'~ a -soils on uplands and ridges. It is about 55
<br />percent Purser fine sandy loam and about 30 percent
<br />Rock outcrop. Purser fine sandy loam is smoother and
<br />less sloping, and Rock outcrop rs steeper commonly on
<br />the western side of t•idges.
<br />Included with this soil in mapping is about 15 per-
<br />cent areas of Itirtley soils.
<br />P.unafl is rapid, and the hazard of erosion is severe.
<br />This soil is suited to native grasses. Capability unit
<br />Vile-1, dryland; Purser soil in Shallow Foothill range
<br />site and Rock outcrop not assigned to a range site; sat
<br />assigned to a windl'•reak suitability group.
<br />Ratake Scrics
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<br />The Ratake series cmtsists of shallow, well drained
<br />ot• somewhat excessively drained soils that formed in
<br />material weathered from granite, schist, or phyllite.
<br />These soils are on upland ridges and mountainsides
<br />and are underlain by weathered phyllite, schist, or
<br />weathered granite at a depth of 10 to 20 inches. Irleva-
<br />tiou ranges from 6,800 to 8,500 feet. Slopes ace 1 to
<br />GO percent. The native vegetation is mainly blue grama,
<br />side-oats grama, slender wheatgrass, bluebuuclt wheat-
<br />grass, mountainmahogany, and sage. Mean annual
<br />precipitation range,; from 14 to 18 inches, mean annual
<br />sir temperature ranges from 44° to 4G° I', attd tits
<br />frost-free season ranges from 75 to 100 days.
<br />Ina representative profile the surface layer is
<br />reddish gray channery loom about 10 inches thick.
<br />The subsoil is reddish brown very channery loots about
<br />5 inches thick. The underlyhtg material is weathered
<br />phyllite or phyllite schist.
<br />Permeability is moderate, and the available water
<br />capacity is low. Reaction is neutral.
<br />These soils are mainly used for native grasses.
<br />Representative profile of Ratake channety loam iu
<br />en area of Ratake-hock outcrop canplex, 25 to 55 per-
<br />cent slopes, in native grass, about 2,350 feet east of
<br />the sout)twest corner of sec. 5, T. 8 N., lt. 70 W.:
<br />Al-0 to 10 inches; t•ecldish gray (SYP. 5/2)
<br />channery loam, dark reddish brown (5Y
<br />3/2) moist; strong fine gr:uu:lar and
<br />crumb structure; soft, very friable; 20
<br />percent soft phyllite chanuers; very high
<br />mica content; neutral; clear smooth
<br />boundary.
<br />B2-10 to 15 ::aches; reddish brown (5YR 5/3)
<br />very channery loam, reddish brown
<br />(5YR 4/3) moist; moderate fine sub-
<br />angul:tr blocky structure parting to
<br />strong fine granular; soft, very friable;
<br />GO percent phyllite charmers; very high
<br />mica content; neutral; diffuse bomrdary.
<br />Cr•-15 to 25 inches; weathered ltltyllite or
<br />phyllil:ic schist; coarse fragments are
<br />weathered and can be crushed in the
<br />hand with some di0iculty but without
<br />significant contributions to the line ports
<br />of the soil on first and secaui breakages;
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<br />47
<br />horizon cats be penetrated with a spade
<br />with difficulty; very high mica content.
<br />The A horizon is loam or sandy loam 7 to 20 inches
<br />thick. The B2 Itor•izou is absent in some profiles. Con-
<br />tent of track fragments, mainly phyllite, schist, or
<br />granite r/4 inch to 2 inches in size, ranges front 35 to
<br />80 percent.
<br />87-Ratake-Rock outcrop complex, 25 Io 55 percent
<br />elo[rce. Tltis complex consists of steep or very steep
<br />soils on mountainsides and ridges. It is about 60 per-
<br />cent Ratake channery loam and about 30 percent Rock
<br />outcrop. Ratake channety loam is less steep, and P.oclr
<br />outcrop is tht•uughout the complex but commonly is
<br />near ridgetops and is steeper.
<br />Included with this soil in mapping is about 10 per-
<br />cent areas of Breece soils along drainageways.
<br />Runoff is rapid, mtd the hazard of water erosion is
<br />severe.
<br />This soil is suited to native grasses. Capability unit
<br />VIIe-1, dryland; Rocky Loam range site; not assigned
<br />to a windbreak suitability group.
<br />Redfcalltcr Scrics
<br />The Redfeather series consists of shallow, well
<br />drained soils that formed in material weathered from
<br />granite. These soils are on ridges and mountainsides
<br />and are underlain by granite bedrock at a depth of 10
<br />to 20 'inches. )Jlevation ranges from 8,500 to 9,500 feet.
<br />Slopes are 5 to 50 percent. The native vegetation is
<br />mainly forest of lodgepole pine, spruce, and some aspen
<br />and a thin understory of grass. Mean annual precipita-
<br />tion ranges from 15 to 20 inches, mean annual air
<br />temperature ranges from 40° to 44° F, and the frost-
<br />frce season ranges from 60 to 85 days.
<br />In a representative profile a 2-inch-thick layer of
<br />organic material is on tits surface. The surface layer
<br />is dark grayish brown and light brownish gray sandy
<br />loam about 8 incites thick. The subsoil rs brown
<br />gravelly sandy loam about 4 inches thick and reddish
<br />brown gravelly sandy clay loam about 5 inches thid:.
<br />Below this is hard granite bedrock.
<br />Permeability is moderately rapid, and the available
<br />water capacity is ]ow. Reaction is medium acid above u
<br />depth of about 1 inch, strongly acid to n depth of
<br />about 12 inches, and medium acid below a depth of 12
<br />inches.
<br />'these soils are used mainly for fot•est and recreation.
<br />Representative Pt'olile of Redfeather sandy loam, 5
<br />to 50 percent slopes, in forest, approximately 1,300
<br />feet south and 1,000 feet west of the northeast corner
<br />of sec. 21, T. 11 N., R. 74 W.:
<br />Ol-2 inches to 1 inch; undecomposed organic
<br />material, mainly needles, bark, and twigs
<br />and remains of understory plants.
<br />02-1 inch to 0; partly decomposed organic
<br />matet•ial like that in the Ol horizon.
<br />Al-0 to 1 inch; dark grayish brown (lOYR 4/2)
<br />sandy loam, very dark brown (lOYR
<br />2/2) moist; weak fine granular struc-
<br />ture; soft, very friable; noncalcareous;
<br />more than 10 percent gravel and stones;
<br />medium acid; clear smooth boundary.
<br />A'L-1 inch Lu 8 inches; light brownish gray
<br />(lOYR G/2) sandy loam, dark grayish
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