|
• JACKSON COUNTY AREA, COLORADC~
<br />Permeability is moderate above a depth of about 26
<br />inches and rapid below that depth. The available water
<br />capacity is low.
<br />These soils are mainly used for grazing. Some areas
<br />are irrigated and used for hay and pasture.
<br />Representative profile of Cabin sandy loam in native
<br />grass, 800 feet west and 425 feet south of the north-
<br />eastcorner of sec. 15, T. 6 N., R. 79 W.:
<br />Al-0 to 4 inches; dark grayish brown (lOYR 4/2) sandy
<br />loam, very dark brown (lOYR 2/2) moist; mod-
<br />erate fine granular structure; soft, very friable,
<br />nonsticky and nonplastic; many fine and medium
<br />roots; 10 percent gravel; mildly alkaline; clear
<br />smooth boundary.
<br />B1-4 to 8 inches; brown (lOYR 4/3) gravelly sandy clay
<br />loam, dark brown (lOYR 3/3) moist; weak medi-
<br />um subangular blocky structure parting to mod-
<br />erate fine granular; slightly hard, friable, slightly
<br />sticky and slightly plastic; many fine and few
<br />medium roots; few thin patchy clay films on peds;
<br />mildly alkaline; gradual wavy boundary.
<br />B2t-8 to 17 inches; brown (lOYR 5/3) gravelly sandy
<br />clay loam, dark brown (lOYR 3/3) moist; weak
<br />medium prismatic structure parting to moderate
<br />medium subangular blocky; hard, friable, slightly
<br />sticky and slightly plastic; few fine roots; 25 per-
<br />cent gravel; thin nearly continuous clay films on
<br />peds, sand grains, and gravel and as bridges be-
<br />tween sand grains; mildly alkaline; diffuse wavy
<br />boundary.
<br />B3-17 to 26 inches; pale brown (lOYR 6/3) very gravelly
<br />sandy loam, brown (lOYR 4/3) moist; weak fine
<br />subangular blocky structuze; slightly hard, very
<br />friable, nonsticky and nonplastic; 58 ercent
<br />gravel; thin patchy clay films on peds; mildly al-
<br />kaline; diffuse wavy boundaryy
<br />IIC-26 to 60 inches; pale brown (lOYR 6/3) very gravelly
<br />sand, brown (lOYR 5/3) moist; single grained;
<br />loose; 70 percent gravel; mildly alkaline.
<br />The Al horizon is fine sandy loam or sandy loam 4 to 10
<br />inches thick. It contains 5 to 20 percent coarse fragments.
<br />It is slightly acid to moderate alkaline. The B2t horizon is
<br />15 to 35 percent coarse fragments. It is medium acid to
<br />mildly alkaline. The contrasting IIC horizon is slightly acid
<br />to mildly alkaline.
<br />Ca-Cabin sandy loam. This soil is on old terraces
<br />and high glacial benches. Slopes are 2 to 5 percent.
<br />Included with this soil in mapping are a few small
<br />areas of soils that are similar to Cabin soils but that
<br />have pockets of calcareous material in the IIC horizon
<br />or that are less than 5 feet deep over sandstone or
<br />shale of the Coalmont Formation. Also included are
<br />small areas of Tiagos soils on narrow, low ridges.
<br />Runoff is medium. The hazard of soil blowing is
<br />severe, and the hazard of water erosion is moderate.
<br />Most of the acreage of this soil is used for grazing.
<br />A small acreage is irrigated and used for hay and
<br />pasture. If this soil is irrigated, an organic mat 1 to 4
<br />inches thick generally forms on the surface and bright,
<br />rust-colored mottles form throughout the profile. Capa-
<br />bility units VIe-3, nonirrigated, and VIe-10, irri-
<br />gated; Dry Mountain Loam range site.
<br />Carlstrom series
<br />The Carlstrom series consists of moderately deep,
<br />well drained soils that formed in weathered shale. The
<br />soils are underlain by clay shale at a depth of 20 to 40
<br />inches. They are on rolling uplands between elevations
<br />of 8,000 and 8,800 feet. Slopes are 5 to 15 percent. The
<br />native vegetation is mainly bluebunch wheatgrass,
<br />16
<br />pine needlegrass, muttongrass, western wheatgrass,
<br />junegrass, big sagebrush, and low rabbitbrush. The
<br />mean annual precipitation is 10 to 12 inches, the mean
<br />annual air temperature is 37° to 38° F, and the frost-
<br />free season is 30 to 40 days.
<br />In a representative profile the surface layer is brown
<br />clay about 7 inches thick. The underlying material is
<br />pale brown clay. Shale is at a depth of about 26 inches.
<br />Permeability is slow, and available water capacity is
<br />IOW.
<br />These soils are used mainly for grazing. Some areas
<br />are used for irrigated hay.
<br />Representative profile of Carlstrom clay in an area
<br />of Crespin-Carlstrom clays in native grass, 1,200 feet
<br />west and 1,050 feet north of the center of sec. 23, T. 9
<br />N., R. 79 W.:
<br />Al-0 to 3 inches; brown (lOYR 5/3) clay, dark brown
<br />(lOYR 4/3) moist; moderate fine granular struc-
<br />ture; soft, very friable, sticky and plastic; many
<br />floe and medium roots; mildly alkaline; clear
<br />smooth boundary.
<br />AC-3 to 7 inches: brown (lOYR 5/3) clay, dark brown
<br />(lOYR 4/$) moist; weak coarse angular blocky
<br />structure parting to medium angular blocky; ex-
<br />tremely hard, very firm, sticky and plastic; few
<br />medium and many fine roots; mildly alkaline;
<br />gradual wavy boundary.
<br />C1-7 to 2ti inches; pale brown (lOYR 6/3) clay, brown
<br />(LOYR 5/3) moist; massive; extremely hard, very
<br />firm, sticky and plastic; mildly alkaline; gradual
<br />wavy boundary.
<br />C?r-26 to 40 inches; shale.
<br />The profile is generally noncalcareous throughout, but a
<br />very thin, discontinuous, weakl}• calcareous horizon is
<br />immediately above the shale in some places. Reaction ranges
<br />from slightly acid to moderately alkaline.
<br />Carlstrom soils are mapped only in association with
<br />Crespin soils.
<br />Chedsey series
<br />The Chedsey series consists of moderately deep,
<br />well drained soils that formed in material weathered
<br />from Chugwater Shale. The soils are underlain by
<br />weathered shale at a depth of 20 to 40 inches. They are
<br />on valley sides and mountain toe slopes between eleva-
<br />tions of 8,200 and 9,000 feet. Slopes are 5 to 12 percent.
<br />The native vegetation is mainly Idaho fescue, big blue-
<br />grass, western wheatgrass, nodding brome, buck-
<br />wheat, big sagebrush, and low rabbitbrush. The mean
<br />annual precipitation is 18 to 20 inches, the mean an-
<br />nual air temperature is 35° to 37° F, and the frost-
<br />free season is 30 to 35 days.
<br />In a representative profile, a layer of undecomposed
<br />organic material 1 inch thick is on the surface. The
<br />surface layer is brown loam about 6 inches thick. The
<br />subsurface layer is light brown loam about 7 inches
<br />thick. The subsoil is reddish brown clay loam about 23
<br />inches thick. The underlying material is soft reddish
<br />brown interbedded shale and siltstone.
<br />Permeability is slow, and available water capacity
<br />is moderate.
<br />These soils are used mainly for grazing.
<br />Representative profile of Chedsey loam, 5 to 12 per-
<br />cent slopes, in native grass, 500 feet west and 1,225
<br />feet north of the southeast corner of sec. 6, T. 11 N.,
<br />R. 81 W.:
<br />
|