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116
<br />SOIL SURVEY
<br />deposits of the Ogallala Formation. Eckley soils are on
<br />upland ridges and knobs and have slopes of 5 to 13 per-
<br />cent. Average annual precipitation ranges from 15 to 19
<br />inches and mean annual temperature is about 49 degrees
<br />F.
<br />The Eckley soils are similar to the Altvan soils. They
<br />are near the Altvan, Dix and Dacono soils. Altvan and
<br />Dacono soils have sand and gravel at depths between 20
<br />and 40 inches. Dix soils have B2 horizons with weak
<br />grades of structure.
<br />A typical pedon of Eckley sandy loam is located 1,600
<br />feet west and 15 feet north of the southeast corner of
<br />section 11, T.7N., R.51W.
<br />AI -0 to 3 inches; dark grayish brown (10YR 4/2) sandy loam, very
<br />dark grayish brown (10YR 3/2) moist; weak fine granular structure;
<br />soft, very friable; neutral (pH 7.0); clear smooth boundary. (3 to 5
<br />inches thick)
<br />BI -3 to 6 inches; dark grayish brown (10YR 412) gravelly sandy clay
<br />loam, very dark grayish brown (10YR 3/2) moist; moderate medium
<br />prismatic parting to moderate medium subangular blocky structure;
<br />slightly hard, friable; neutral (pH 7.0); clear smooth boundary. (2 to
<br />4 inches thick)
<br />B2t -6 to 15 inches; dark brown (7.5YR 4/2) gravelly sandy clay loam,
<br />dark brown (7.5YR 3/2) moist; moderate coarse prismatic parting to
<br />moderate coarse subangular blocky structure; hard, firm; thick con-
<br />tinuous clay films on face of peds; neutral (pH 72); clear wavy
<br />boundary. (6 to 10 inches thick)
<br />B3 -15 to 20 inches; brown (7.5YR 5/4) gravelly coarse sandy loam, dark
<br />brown (7.5YR 4/4) moist; weak coarse prismatic structure; hard,
<br />very friable; neutral (pH 72); gradual wavy boundary. (3 to 5 inches
<br />thick)
<br />IICI -20 to 43 inches; light brown (7.5YR 6/4) gravelly loamy coarse
<br />sand, dark brown (7.5YR 4/4) moist; massive; hard, very friable;
<br />mildly alkaline (pH 7.4); gradual wavy boundary.
<br />IIC2 -43 to 60 inches; light brown (7.5YR 6/4) coarse sand and gravel,
<br />brown (7.5YR 514) moist; single grained; loose, dry and moist; cal-
<br />careous with some gravel lime coated mainly on the underside;
<br />mildly alkaline (pH 7.6).
<br />Depth to the contrasting IIC horizon ranges from 12 to 20 inches.
<br />These soils are commonly noncalcareous, but some pedons have weak ac-
<br />cumulations of calcium carbonate below depths of 40 inches.
<br />The A horizon has color value of 4 or 5 dry, 2 or 3 moist, and chroma
<br />of 2 or 3. It is a gravelly sandy loam or gravelly loam. The B2t horizon
<br />has a hue of 10YR or 7.5YR.
<br />Els Series
<br />The Els series consists of deep, somewhat poorly
<br />drained soils formed in alluvium overlying sand and
<br />gravel. Els soils are on Iow terraces and bottomlands of
<br />the South Platte River and have slopes of 0 to 1 percent.
<br />Average annual precipitation ranges from 13 to 19 inches
<br />and mean annual temperature is about 48 degrees F.
<br />Els soils are similar to the Alda soils. They are near the
<br />Alda and Westplain soils. Alda and Westplain soils have
<br />dark surface layers with moist color values of 3 or less.
<br />A typical pedon of Els loamy sand is located 1,150 feet
<br />east and 225 feet north of the southwest corner of sec. 16,
<br />T.10N., RAW
<br />Al -0 to 6 inches; grayish brown (10YR 5/2) loamy sand, very dark
<br />grayish brown (10YR 3/2) moist; weak fine granular structure; soft,
<br />very friable; neutral (pH 7.0); clear smooth boundary. (4 to 7 inches
<br />thick)
<br />ACl -6 to 13 inches; light brownish gray (10YR 6/2) loamy fine sand,
<br />dark grayish brown (10YR 4/2) moist; weak coarse subangular
<br />blocky structure; soft, very friable; neutral (pH 7.0); gradual smooth
<br />boundary. (5 to 8 inches thick)
<br />AC2 -13 to 17 inches; light brownish gray (10YR 6/2) loamy fine sand,
<br />dark grayish brown (10YR 4/2) moist; massive; soft, very friable;
<br />calcareous; mildly alkaline (pH 7.4); clear smooth boundary. (4 to 8
<br />inches thick)
<br />Clca -17 to 25 inches; light gray (10YR 7/2) loamy fine sand, grayish
<br />brown (10YR 5/2) moist; massive; soft, very friable; calcareous;
<br />mildly alkaline (pH 7A); clear smooth boundary. (7 to 10 inches
<br />thick)
<br />C2 -25 to 58 inches; light gray (2.5Y 7/2) loamy fine sand, with thin
<br />strata of silt loam, grayish brown (2.5Y 5/2) moist, with common
<br />medium distinct yellowish brown (10YR 5/8) moist mottles; massive;
<br />soft, very friable; calcareous; mildly alkaline (pH 7.4); smooth boun-
<br />dary. (20 to 35 inches thick)
<br />IIC3 -58 to 60 inches; brown (10YR 5/3) moist with common medium
<br />brown (7.5YR 5/4) moist mottles; mixture of coarse sand and
<br />gravel; single grained; loose, dry and moist; neutral (pH 72).
<br />Sand and gravel occurs below depths of 40 inches.
<br />The A horizon has a color value of 4 through 6 dry, 3 or 4 moist and
<br />chroma of 2 or 3. Moist values of 3 extend to depths of less than 7
<br />inches. The A horizon is commonly a loamy fine sand but ranges to fine
<br />sand. The C horizon is a loamy fine sand or fine sand and is stratified.
<br />Epping Series
<br />The Epping series consists of shallow, well drained soils
<br />that formed in calcareous materials weathered from Brule
<br />siltstone. Epping soils are on upland ridges and have
<br />slopes of 3 to 9 percent. Average annual precipitation
<br />ranges from 13 to 17 inches and mean annual temperature
<br />is about 49 degrees F.
<br />Epping soils are similar to the Canyon and Shingle
<br />soils. They are near the Keota and Mitchell soils. Canyon
<br />soils have 15 to 35 percent coarse fragments and formed
<br />in materials weathered from calcareous sandstone. Shin-
<br />gle soils formed in materials weathered from interbedded
<br />soft shale and sandstone. Keota and Mitchell soils have
<br />bedrock at depths below 20 inches.
<br />A typical pedon of Epping loam is located 390 feet west
<br />and 38 feet north of the quarter corner, section 35,
<br />T.11N., R.52W.
<br />Al -0 to 3 inches; light brownish gray (10YR 6/2) loam, very dark gray-
<br />ish brown (10YR 3/2) moist; weak fine subangular blocky structure;
<br />soft, very friable; calcareous; mildly alkaline (pH 7.4); clear smooth
<br />boundary. (3 to 5 inches thick)
<br />AC -3 to 7 inches; very pale brown (10YR 7/3) loam, dark grayish
<br />brown (10YR 4/2) moist; weak medium prismatic structure; slightly
<br />hard, very friable; 5 percent weathered Brule siltstone fragments;
<br />calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (4
<br />to 7 inches thick)
<br />Cca -7 to 11 inches; light gray (10YR 7/2) loam, brown (10YR 5/3)
<br />moist; massive; hard, very friable; 20 percent weathered fragments
<br />of Brule siltstone; calcareous with lime occurring as concretions and
<br />in thin seams and streaks; moderately alkaline (pH 8.4); clear wavy
<br />boundary. (3 to 8 inches thick)
<br />Cr -11 to 60 inches; very pale brown (10YR 8/3) siltstone of the Brule
<br />Formation, brown (10YR 5/3) moist; calcareous.
<br />The depth to bedrock ranges from 10 to 20 inches. Fragments of par-
<br />tially weathered Brule siltstone are common on the surface and
<br />throughout the soil with a range of 0 to 15 percent.
<br />The A horizon has a color value of 5 through 7 dry, 3 or 4 moist and
<br />chroma of 2 or 3. Moist values of 3 extend to depths of less than 5
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