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WELD COUNTY, COLORADO, SOUTHERN PART
<br />1121t--12 to 16 inches; brown 00YR 5/3) fine sandy loam, brown (IOY12
<br />413) moist; moderate medium prismatic structure parting to
<br />moderate medium subangular blocky; hard, friable; few thin clay
<br />films on faces of peds; neutral; clear smooth boundary.
<br />BZh-16 to 22 inches; yellowish brown (IOYR 5/4) fine sandy loam,
<br />brown (10YR 4/3) moist; moderate medium prismatic structure
<br />parting to weak medium subangular blocky; hard, friable; few thin
<br />clay films on faces of peels; neutral; gradual smooth boundary.
<br />B3--22 to 28 inches; light yellowish brown (10YR 6/4) fine sandy loarn,
<br />yellowish brown (10YR 5/4) moist; weak coarse subanglar blocky
<br />structure.; slightly hard, very friable; calcareous; mildly alkaline-,
<br />clear smooth boundary.
<br />Cra---28 to 60 inches; tight yellowish brown (10YR 6/4) sandy loam, yet-
<br />lowish brown (10YR 5/4) moist; massive; slightly hard, very friable;
<br />some visible, time in fine filaments or threads- calcareous; moderate-
<br />ly alkaline.
<br />Thickness of the solum ranges from Ida to 37 inches. Coarse fragments
<br />make up 0 to 10 percent of the solum. Depth to free carbonates ranges
<br />from 12 to 24 inches.
<br />The A horizon has value of 5 or 6 dry and 3 to 5 moist and chroma of
<br />2 or 3. It is loamy sand or sandy loam. The It2t horizon is commordy fine
<br />sandy loam that is 10 to 18 percent clay. The C horizon ranges from
<br />(*arse loamy sand to sandy loam
<br />Weld series
<br />The Weld series consists of deep, well drained soils that
<br />formed in calcareous eolian deposits. Weld soils are on
<br />smooth plains. Slopes are 0 to 5 percent.
<br />Weld soils are near the Adena, Colby, Nunn, and Wiley
<br />soils- Adena soils have a light colored surface layer and
<br />solum less than 15 inches thick. Colby soils lack a B
<br />horizon. Wiley soils have a light colored surface layer and
<br />less clay in the 132t horizon. Nunn soils lack an abrupt
<br />textural boundary between the A and B horizon.
<br />Typical pedon of Weld loam, 1 to 3 percent slopes, 2,470
<br />feet south and 200 feet west of northeast corner sec. 35,
<br />T. 1 N., It. 61 W.
<br />Ap-0 to 8 inches; brown (IOYR 5/3) loam, dark brown (10YR 3/3)
<br />moist; moderate medium granular structure; hard, friable; neutral;
<br />abrupt smooth boundary.
<br />132]t--8 to 12 inches; brown (10YR 5/3) light clay, brown (10YR 4/3)
<br />moist; strong fine prismatic structure parting to strong fine angular
<br />blocky; very hard, firm; many moderately thick clay films on faces
<br />of peds; neutral; clear smooth boundary.
<br />132i1-12 to 15 inches; pale brown (10YR-6/3) heavy clay loam, brown
<br />(IOYR 4/3) moist; strong fine prismatic structure parting to strung
<br />fine angular blocky; very hard, firm; many moderately thick clay
<br />films on faces of peels; neutral; clear smooth boundary.
<br />133ra-15 to 28 inches; very pale brown (10YR 7/3) loam, pale brown
<br />00YR 6/3) moist; moderate medium prismatic structure parting to
<br />moderate medium subangular blocky; hard, friable; few thin, clay
<br />films on faces of some peds; some visible time ocouring in fine soft
<br />masses; calcareous; moderately alkaline; clear smooth boundary.
<br />Cca---28 to 60 inches; very pale brown (10YR 7/3) silt loam, pale brown
<br />(10YR 6/3) moist; massive; slightly hard, friable; some visible time
<br />in fine filaments or threads; calcareous; moderately alkaline.
<br />Thickness of the solun ranges from 20 to 39 inches. Depth to free car
<br />donates ranges from 10 to 20 inches.
<br />The A horizon has value of 4 or 5 dry and2 or 3 moist and chroma of
<br />2 or 3. The 132t horizon is commonly light clay or heavy clay loan that is
<br />:15 to 45 percent clay. The C horizon is commonly silt loam or loam.
<br />Wiley series
<br />7.5
<br />The Wiley series consists of deep, well drained soils
<br />that formed in calcareous eolian deposits- Wiley soils are
<br />on plains. Slopes are 0 to 5 percent.
<br />Wiley soils are similar to the Renohill and Ulm soils
<br />and are, near the Colby, Ifeldt, and Weld soils. Renohill
<br />soils have shale between 20 and 40 inches- Ulm, Heldt,
<br />and Weld soils are more than 35 percent clay in the B2
<br />horizon. Colby soils lack a B horizon.
<br />Typical pedon of Wiley silt: loam in an area of Wiley-
<br />Colby complex, 1 to 3 percent slopes, in the northeast
<br />quarter sec. 34, T. 3 N., R- C6 W.
<br />Ap---o to I1 inches; pale brown (10YR 6/3) silt loam, dark grayish brown
<br />(10YR 4/2) moist; weak: fine granular structure; very hard, friable;
<br />calcareous; mildly alkaline; clear smooth boundary.
<br />In--11 to 24 inches; pale brown (10YR 6/3) silty clay loam, brown
<br />00YR 5/3) moist; weak medium prismatic structure parting to
<br />moderate medium subangular blocky; very hard, firm; few thin clay
<br />films on faces of peels; calcareous; moderately alkaline; gradual
<br />smooth boundary.
<br />Baca-24 to 34 inches; pale brown (IOYR 6/3) silty clay loam, brown
<br />(IOYR 5/3) moist; weak medium prismatic structure parting to
<br />moderate medium subangular blocky; very, hand, firm; some visible
<br />lime in fine filaments and seams; calcareous; moderately alkaline;
<br />gradual smooth boundary.
<br />Cca-_34 to 60 inches; very pale brown (10YR 7/3) silty clay loam, brown
<br />(10YR 5/3) moist; massive; very hand, friable; some visible lime in
<br />fine soft. masses; calcareous; moderately alkaline.
<br />Thickness of the solum ranges from 16 to 40 inches- Typically these
<br />soils have free carbonates at the surface.
<br />The A horizon has hue of 10YR or 2.5Y, value of 5 to 7 dry and 3 to 5
<br />moist, and chroma of 2 or 3. The B2t horizon is commonly silty clay loam
<br />that is 28 to 35 percent clay. The C horizon is commonly silty clay la'um
<br />or silt loam-
<br />References
<br />(1) American Association of State Highway (and Transportation) Offi-
<br />cials. 1970. Standard specifications for highway materials and
<br />methods of sampling and testing. Ed. 10, 2 vol., i0us.
<br />(2) American Society for Testing and Materials. 1974. Methods for clas
<br />sification of soils for engineering purposes. ASTM Stand. 1) 2187-
<br />69. In 1974 Annual Btxok of ASTM Standards, Part 19, 464 pp.,
<br />illus.
<br />(3) Colorado Department of Agriculture. 197.5. Colorado agricultural
<br />statistics, 1974 Preliminary, 1973 Final Bull. 1-75.
<br />(4) United States Department of Agriculture. 1951. Soil survey manual.
<br />U. S. Dep. Agne. Handb. 18, 503 pp., illus. (Supplements replacing
<br />pp- 173-188 issued May 1962)
<br />(5) United States Department of Agriculture. 1975- Soil Taxonomy. A
<br />basic system of soil classification for making soil surveys. Soil
<br />Conserve Service, U. S. Dep. Agric. Handb. 436. 754 pp., illus-
<br />Glossary
<br />ARC soil. A soil having an A, a B, and a C horizon.
<br />AC soil. A soil having only an A and a C horizon. Commonly such soil
<br />formed in recent alluvium or on steep rocky slopes.
<br />Aeration, soil. The exchange of air in soil with air from the atmosphere.
<br />The air in a well aerated soil is similar to that in the atmosphere;
<br />the air in a poorly aerated soil is considerably higher in carbon diox-
<br />ide and lower in oxygen.
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