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• JAC$sON COUNTY AREA, COIARADO •
<br />02-1 inch to 0; partially decomposed organic material
<br />similar to that of horizon above.
<br />p2-0 to 4 inches; Hght brownish gray (10YR 6/2) stony
<br />sandy loam, grayish brown (lOYR 6J2) moist;
<br />moderate thin platy structure parting to fine gran-
<br />ular; soft, very friable, nonsticky and nonplastic;
<br />many medium roots; 15 ercent stones; strongly
<br />acid; abrupt smooth boundary.
<br />H2ir--4 to 14 inches; brown (7.5YR 5/4) very stony sandy
<br />loam, dark brown (7.5YR 4/4) moist; weak fine
<br />subangular blocky structure parting to medium
<br />granular; slightly hard, very friable, nonsticky
<br />and nonplastic; many medium and fine roots; 20
<br />percent stones; many dark concretions and pellets
<br />of manganese and iron humates; strongly acid;
<br />gradual wavy boundary.
<br />C-14 to 60 inches; brown (lOYR 5/3) extremely stony
<br />sandy loam, dark brown (lOYR 473) moist; mas-
<br />sive; slightly hard, very friable, nonsticky and
<br />nonplastic; few medium and fine roots above a
<br />depth of about 30 inches; 40 percent stones;
<br />strongly acid.
<br />The upper part of the profile is 10 to 35 percent coarse
<br />fragments, and the lower part is 35 to 75 percent coarse
<br />fragments. The coarse fragments are dominantly stones 10
<br />to 24 inches in diameter. Reaction ranges from very strongly
<br />acid to medium acid. A very thin, discontinuous, dark-
<br />colored Al horizon is present in some places.
<br />Pr-Pinkham-Rock outcrop association. This as-
<br />sociation is on glacial moraines and mountainsides in a
<br />narrow belt below timberline in the southeastern part
<br />of the survey area. Slopes are 10 to 60 percent. This
<br />association is about 55 percent Pinkham stony sandy
<br />loam and about 25 percent Rock outcrop. Rock out-
<br />crop is on ridge crests, cliffs, and slope breaks.
<br />Included with this association in mapping are about
<br />20 percent areas of Mirror and MacFarlane soils and
<br />small areas of poorly drained soils adjacent to stream
<br />channels.
<br />Runoff is slow. The hazard of water erosion is severe,
<br />and the hazard of soil blowing is slight.
<br />This association is in forest and is used for produc-
<br />ing timber, for recreation, and for wildlife habitat.
<br />Pinkham part in capability unit VIIs-1, nonirrigated,
<br />and Rock outcrop part in capability unit VIIIs-1,
<br />nonirrigated; not placed in a range site.
<br />Randman series
<br />The Randman series consists of deep, poorly drained
<br />soils that formed in noncalcareous outwash and allu-
<br />vium. They are underlain by very gravelly sand at a
<br />depth of 20 to 40 inches. The soils are on low terraces
<br />and benches between elevations of 7,820 and 9,000 feet.
<br />Slopes are 1 to 4 percent. The mean annual precipita-
<br />tion is 10 to 15 inches, the mean annual air tempera-
<br />ture is 36° to 38° F, and the frost-free season is 35 to
<br />45 days.
<br />In a representative profile an organic mat of grass
<br />roots and fleshy remains of grasses 1 inch thick is on
<br />the surface. The surface layer is grayish brown sandy
<br />loam about 6 inches thick. The upper 4 inches of the
<br />subsoil is grayish brown gravelly heavy sandy loam,
<br />and the lower 20 inches is light brownish gray gravelly
<br />sandy clay loam. Very gravelly sand is at a depth of
<br />about 30 inches.
<br />Permeability is moderate above a depth of 30 inches
<br />and rapid below a depth of 30 inches. Available water
<br />capacity is moderate, The water table is at a depth of
<br />43
<br />0 to 15 inches during the irrigation season. These soils
<br />are wet most of the year.
<br />These sons are irrigated and are used mainly for
<br />grass hay and pasture.
<br />Representative profile of Randman sandy loam in
<br />irrigated hay, 650 feet east and 300 feet north of the
<br />southwest corner of sec. 35, T. 7 N., R, 79 W.:
<br />Ol-1 inch to 0; undecomposed organic material, mainly
<br />grass roots and fleshy remains of dead grasses.
<br />Alg-0 to 6 inches; grayish brown (lOYR 5/2) sandy loam,
<br />very dark gra ,sh brown (lOYR 3/2) moist; com-
<br />mon medium distinct mottles, dark reddish brown
<br />(5YR 3!4) and dark gray (2.5Y 4{1) moist; mod-
<br />erate fine crumb structure; soft, very friable, non-
<br />sticky and nonplastic; many fine and medium
<br />roots; neutral; clear wavy boundary.
<br />Blg-6 to 10 inches; grayish brown (lOYR 5/2) gravellyy
<br />heavy sandy Loam, very dark grayish brown (10YR
<br />3/2) moist; many medium distinct mottles, reddish
<br />brown (SY 4/4) and dark gray (2.SY 411) moist;
<br />moderate fine subangular blocky structure parting
<br />to fine granular; slightly hard, very friable, non-
<br />sticky and nonplastic; many fine roots; 15 percent
<br />gravel and some cobbles; few thin patchy clay
<br />films on peds; mildly alkaline; gradual wavy
<br />boundary.
<br />B2tg-30 to 30 inches; light brownish gray (2.SY 6/2) grav-
<br />elly sandy clay loam, grayish brown (2.5Y 5/2)
<br />~, moist; many large distinct mottles, olive yellow
<br />(2.5Y 6/6) and dark gray (2.5Y 4/1) moist; mod-
<br />erate coarse prismatic structure parting to medium
<br />subangular blocky; very hard, friable, slightly
<br />sticky and slightly plastic; few fine roots; 20 per-
<br />cent gravel; nearly continuous clay films on peds
<br />and in pores; mildly alkaline; gradual wavy bound-
<br />ary.
<br />IIC-30 to 60 inches; noncalcareous very gravelly sand;
<br />many large distinct light olive brown (2.5Y 5/6)
<br />mottles.
<br />The profile is neutral to mildly alkaline. The dark-colored
<br />A horizon ranges from 5 to 15 inches in thickness. The pro-
<br />file is mottled from near the surface downward. Mottles
<br />range from distinct to prominent. Content of coarse frag-
<br />ments 'h inch to 10 inches in diameter ranges from 5 to 35
<br />percent above the contrasting IIC horizon.
<br />Ra-Randman sandy loam. This soil is on low ter-
<br />races, high terraces, and benches throughout the sur-
<br />vey area. Slopes are 1 to 4 percent. The water table is
<br />at a depth of 0 to 15 inches. This soil is not usually
<br />subject to overflow.
<br />Included with this soil in mapping are a few small
<br />areas of soils that are similar to Randman soils but
<br />have pockets of calcareous material below the subsoil.
<br />Also included are small areas of Eachuston soils on
<br />narrow filled channels and on the outer edge of terraces
<br />or benches.
<br />Runoff is slow. The hazards of water erosion and
<br />soil blowing are slight.
<br />This soil is irrigated and used for grass hay and
<br />pasture. An organic mat 1 to 4 inches thick has formed
<br />on the surface and bright, rust-colored mottles have
<br />formed throughout the profile, Capability unit VIw~,
<br />irrigated; not placed in a range site.
<br />Rawah series
<br />The Rawah series consists of moderately deep, well
<br />drained soils that formed in weathered, calcareous red-
<br />bed shale of the Chugwater Formation. The soils are
<br />underlain by soft shale at a depth of 20 to 40 inches.
<br />The soils are on hills and ridges on uplands between
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