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ADAMS COIIN'PY, COLORADO
<br />described as representative for the series, but the soil
<br />layers are slightly thinner. Surface runoff is medium,
<br />and the hazard of water erosion is moderate.
<br />Nearly all areas of this soil are cultivated, and many
<br />of these are irrigated. In dryfarmed areas, winter wheat,
<br />barley, and sorghums are grown. This soil supports native
<br />grass, which inchldes blue grams and western wheatgrass.
<br />Capability unitIIe-1, irrigated, and IIIc-l,nonirrigated;
<br />Loamy Platns range site; tree planting suitability group 1.
<br />Shingle Series
<br />The Shingle series consists of well-drained, gently
<br />sloping to steep soils on uplands. These soils formed
<br />in loamy material underlain by shale at a depth of 10
<br />to 20 inches.
<br />In a representative profile, the surface layer is light
<br />brownish-gray loam about 7 inches thick. It is highly
<br />calcareous. The underlying material is light yellowish-
<br />brown loam that is highly calcareous. Calcareous sandy
<br />shale bedrock is at a depth of about 12 inches.
<br />Shingle soils absorb water at a'moderate rate, and the
<br />available water capacity is very low. Permeability .is
<br />moderate, and the entire soil is suitable for roots.
<br />Representative profile of a Shingle loam having a
<br />slope of about 8 percent, in an area of grass, 1,400 feet
<br />west and 1,400 feet north of the southeast corner of
<br />section 33, T. 3 S., R. 58 W.:
<br />Al-0 to 3 inches, light brownish-gray (2.5Y 6/2) loam,
<br />grayish brown (2.5Y 5/2) when moist; weak, fine,
<br />platy structure parting to weak, 5ne, granular struc-
<br />ture; soft, friable; calcareous; moderately alkaline;
<br />clear, smooth boundary.
<br />A(:-3 to 7 inches, light brownish-gray (2.5Y 6/2) loam, gray-
<br />ish brown (2.5Y 5/2) when moist; weak, medium,
<br />subangular blocky structure; hard, friable: calcare-
<br />ous; moderately alkaline: gradual, smooth boundary.
<br />C-7 to 12 inches, light yellowish-brown (2.5Y 6/3) loam,
<br />grayish brown to light olive brow^ (2.5Y 5/3) when
<br />moist; weak, coarse, subangular blocky structure
<br />parting to weak, medium, subangular blocky struc-
<br />ture; hard, firm; calcareous; moderately alkaline;
<br />gradual, smontli boundary.
<br />R-12 inches, stratified, varicolored, fine sandy shale and
<br />shalt' sandstone; calcareous.
<br />The A horizon ranges from 3 to S inches in thickness, fmm
<br />IiRht brownish gray to pale brawn in cnloq and, in places,
<br />from loam to heavy fine sandy loam in texture. The C horizon
<br />ranges from 5 to lR inrhes in thickness. from Inam to light
<br />silty clay Inam in texture, and from very pale brown to light
<br />yellowish brown in color. Depth to bedrock ranges from 10 to
<br />20 inches.
<br />Shingle-Renohill looms, 5 to 25 percent slopes ISrEI.-
<br />The moderately sloping to strongly sloping soils of this
<br />complex are nn uplands. The. soils are mainly Shingle
<br />loam and Renohill loam, and both, are underlain by
<br />sandstone or by interbedded sandstone and sandv shale.
<br />Thev are intermingled with outcrops of fine-drained
<br />sandstone, some remnants of loess, a fe.w shalt' out-
<br />crops, and a small amount of Loamy alluvial land.
<br />Shingle loam makes up about 40 percent of the com-
<br />plex and is nearer to the sandstone outcrops than Reno-
<br />hill loam, which makes up about 35 percent of the
<br />complex.
<br />Included in mapping are outcrops of sandstone or of
<br />sandstone and shale, which make up 10 percent of the
<br />21
<br />complex; areas of Loamy alluvial lands, which make
<br />up 5 percent; slickspots, which make up 5 percent; and
<br />areas of Colby soils, which make up the remaining 5
<br />percent. Some of the sandstone outcrops have a thin
<br />layer of gravel. Some'of the sandstone knobs are largo
<br />sandy concretions that are weathering into soil ma-
<br />terial.
<br />Runoff is medium to rapid, and the hazard of erosion
<br />is moderate to severe. Gullies form in the swales, and
<br />sheet erosion occurs in exposed areas-that have been
<br />cultivated or overgrazed. Steep, broken slopes cause
<br />limitations. Most areas of this complex have a cover
<br />of native grass. A few areas were cultivated at one time
<br />but have since been abandoned. Capability unit VIe-2,
<br />nonirrigated; Loamy Slopes range site; tree planting
<br />suitability group 4.
<br />Sitoneham Series
<br />The Stoneham series consists of well-drained, nearly
<br />level to moderately sloping soils on uplands. These soils
<br />formed in loamy, old alluvial material.
<br />In a representative profile (fig. Il),the surface layer
<br />is light grayish-brown loam about 5 inches thick: It is
<br />noncalcareous. The subsoil is brown sandy clay loam
<br />about 8 inches thick. It is noncalcareous. The underlying
<br />material is light-gray sandy loam and gravelly loam
<br />that is highly calcareous. At a depth of 30 inches, it is
<br />pale-brown gravelly sandy loam that is highly cal-
<br />careous. It extends to a depth of about 00 inches.
<br />Stoneham soils absorb water at a moderate rate, and
<br />the available .water capacity is moderate. Permeability
<br />is moderate, and the entire soil is suitable for roots.
<br />Representative profile of Stoneham loam, 3 to 9 per-
<br />cent slopes, in an area of grass, 170 feet south and 20
<br />feet east of the northwest corner of section 21, T. 3 S.,
<br />R. 59 W.:
<br />Al-0 to 5 inches, light grayishbrown (lOYR 6/2) loam, dark
<br />grayish brown (lOYR 9/2) when moist; weak, med-
<br />ium, granular Structure; soft, friable; many fibrous
<br />roots; noncalcareous; neutral; clear, smooth boon-~
<br />dart'.
<br />B2t-5 to 13 inches, brown (lOYR 5/3) sandy clay loam, dark
<br />brown (lOYR 4/3) when moist; moderate, medium,
<br />prismatic structure parting to weak to moderate
<br />subangular blocky structure; thin clay films an ped
<br />faces; hard, friable; noncalcareous; mildly alkaline;
<br />gradual, smooth boundary.
<br />Clca-13 to 20 inches, light-gray (lOYR 7/2) sandy loam,
<br />pale brown (lOYR 6/3) when moist; weak, medium,
<br />subangular blocks structure; hard, friable; calcare-
<br />ous and contains lime in splotches and disseminated;
<br />moderately alkaline; clear, smooth boundary.
<br />I[C2ca-20 to 30 inches, light-gray (lOYR 7/2) gravelly
<br />loam, pale brown (lOYR 6/3) when moist; massive;
<br />hard, friable: 15 percent gravel; calcareous and
<br />contains common, medium and coarse, lime mottles
<br />(lOYR 8/2) and disseminated lime; moderately alka-
<br />line; clear, smooth boundary.
<br />IIC3-30 to 60 inches, palebrown (lOYR 6/3) gravelly sandy
<br />loam, brown (lOYR 5/3) when moist; massive;
<br />slightly hard, very friable: 18 percent gravel; cal-
<br />careous and contains disseminated lime; moderately
<br />alkaline; cleaq wavS boundary.
<br />The A horizon ranges from 3 to 7 inches in thickness, from
<br />grayish brown to pale Grown in color, and from heavy fine
<br />sandy loam to loam in restore. The B horizon ranges from
<br />5 to 10 inches in thickness, from brown to light brown in
<br />color, and from IiRht clay loam to coarse sandy loam in tex-
<br />ture. Depth to calcareous material ranges from 3 to 15 inches.
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