|
WELD COUNTY, COLORADO, SOUTHERN PART
<br />percent weathered shale chips; calcareous; moderately alkaline;
<br />gradual wavy boundary-
<br />C2r-13 inches; calcareous clayey shale.
<br />Typically these soils have free carbonates at the surface. Depth to
<br />shale ranges from 10 to 20 inches.
<br />The A horizon has hue of IOYR or 25Y, value of 5 or 6 dry and 3 or 4
<br />moist, and chroma of 2 or 4. The C horizon has hue of IOYR or 2.5Y. It
<br />is commonly clay that is 40 to 45 percent clay.
<br />Nelson series
<br />The Nelson series consists of moderately deep, well
<br />drained soils that formed in residuum from soft calcare-
<br />ous sandstone. Nelson soils are on plains. Slopes are 0 to
<br />9 percent.
<br />Nelson soils are similar to Kim, Otero, Tassel, and
<br />Thedalund soils and are near the Olney soils. Kim, Otero
<br />and Olney soils are deep. Tassel soils have sandstone
<br />between 10 and 20 inches. Thedalund soils are more than
<br />18 percent clay in the C, horizon.
<br />Typical pedon of Nelson fine sandy loam, 0 to 3 percent
<br />slopes, 2,000 feet south and 2,450 feet east of northwest
<br />corner sec. 17, T. 6 N., It. 66 W.
<br />Ap-0 to 9 inches; light brownish gray (10YR 612) fine sandy loam, dark
<br />grayish brown (10YR 4/2) moist; weak medium subangular blocky
<br />structure parting to moderate fine granular; slightly hard, very fria-
<br />ble; calcareous; moderately alkaline; abrupt smooth boundary.
<br />Clea-9 to 30 inches; light olive brown (2.5Y 5/4) fine sandy loam, olive
<br />brown (2.5Y 4/4) moist; massive; hard, very friable; some visible
<br />lime occuring as concretions and in fine seams and filaments; cal-
<br />careous; moderately alkaline; gradual wavy boundary-
<br />C2r-30 inches; soft calcareous sandstone.
<br />Typically these soils have free carbonates at the surface. Depth to
<br />soft sandstone ranges from 20 to 40 inches- Content of rock fragments
<br />ranges from 0 to 10 percent.
<br />'The A horizon has hue of IOYR or 2.5Y, value of 5 or 6 dry and 3 or 4
<br />moist, and chroma of 2 or 3, The C horizon has hue of ioYR or 2.5Y. It
<br />is fine sandy loam or sandy loam-
<br />Nunn series
<br />The Nunn series consists of deep, well drained soils
<br />that formed in mixed alluvium and eotian deposits. Nunn
<br />soils are on terraces, alluvial fans, and smooth plains.
<br />Slopes are 0 to 3 percent.
<br />Nunn soils are similar to the Altvan and Dacono soils
<br />and are near the Colombo, Tort Collins, Haverson, and
<br />Weld soils. Altvan and Dacono soils have a sand and
<br />gravel C horizon at a depth of 20 to 40 inches. Colombo
<br />and Iaverson soils lack a B horizon. Fort Collins soils are
<br />less than 35 percent clay in the B horizon. Weld soils have
<br />an abrupt textural boundary between the A and B
<br />horizons.
<br />Typical pedon of Nunn clay loam, 0 to 1 percent slopes,
<br />400 feet north and. 1,040 feet east of southwest corner
<br />sec. 22, T. 6 N-, R. 66 W.
<br />Ap-A to 9 inches; grayish brown (10YR 5/2) clay loam; very dark gray-
<br />ish brown (10YR 3/2) moist; moderate fine granular structure;
<br />slightly hard, friable; noncalcareous; mildly alkaline; clear smooth
<br />boundary.
<br />71
<br />112t--9 to 19 inches; light brownish gray (IOYR 612) heavy clay loam,
<br />dark grayish brown (10YR 4/2) moist; moderate fine prismatic
<br />structu m parting to moderate fine subangular blocky; very hard,
<br />firm; common moderately thick clay films on faces of peds; noncal-
<br />careous; mildly alkaline,; clear wavy boundary.
<br />1`13-49 to 23 inches; light brownish gray (10YR 612) heavy clay loam,
<br />dark grayish brown (IOYR 4/2) moist; moderate medium prismatic
<br />structure parting to weak fine subangular blocky; hard, friable; cal-
<br />careous; mildly alkaline; clear wavy boundary.
<br />C1ca---23 to 29 inches; light brownish gray (10YR 6/2) clay loam, dark
<br />grayish brown (10YR 4/2) moist; weak coarse prismatic structure
<br />parting to weak medium subangular blocky; slightly hard, very fria-
<br />ble; some visible lime in fine seams and filaments; calcareous;
<br />moderately alkaline; clear wavy boundary.
<br />C2ca-29 to (A inches; brown (IOYR 5/3) sandy loam, dark brown (10YR
<br />4/3) moist; weak coarse subangular blocky structure; soft, very fria-
<br />ble; some visible lime in fine filaments; calcareous; moderately al-
<br />kaline.
<br />'Thickness of the solum ranges from 17 to 33 inches. Coarse fragments
<br />make up as much as 10 percent of the solum. Depth to free carbonates
<br />ranges from 12 to 2) inches.
<br />The A horizon has hue of MY R or 25Y, value of 4 or 5 dry and 2 or 3
<br />moist., and chroma of 2 or 3. It is clay town, loam, or loamy sand- The
<br />B2t. horizon is commonly heavy clay loam that is 35 to 40 percent, clay.
<br />Olney series
<br />The Olney series consists of deep, well drained soils
<br />that formed in alluvium. Olney soils are on plains. Slopes
<br />are 0 to 5 percent.
<br />Olney soils are similar to the Fort Collins and Vona
<br />soils and are near the Kim, Nelson, Otero, and Thedalund
<br />soils. Fort Collins soils are less than 35 percent fine and
<br />coarser sand in the B horizon. Vona soils are less than 18
<br />percent clay in the B horizon.. Nelson and Thedalund soils
<br />have sandstone and shale between 20 and 40 inches.
<br />Typical pedon of Olney fine sandy loam, 0 to I percent
<br />slopes, 1,320 feet north and 284 feet east of southwest
<br />corner sec. 28, T. 6 N., R. 66 W.
<br />Ap-0 to 10 inches; grayish brown (10YR 5/2) fine sandy loam, dark
<br />grayish brown (10YR 4/2) moist; weak fine granular structure;
<br />slightly hard, very friable; nonraleareous; mildly alkaline; abrupt
<br />smooth boundary.
<br />132t-10 to 20 inches; yellowish brown (10YR 514) sandy clay loam, dark
<br />yellowish brown (10YR 4/4) moist; moderate medium prismatic
<br />stricture parting to moderate fine subangular hlocky; hard, friable;
<br />common moderately thick clay films on fares of peds; noncalcarenus;
<br />mildly alkaline; clear wavy boundary.
<br />Baca 20 to 25 inches; very pale brown (10YR 7/3) sandy clay loam,
<br />brown (10YR 513) moist; moderate coarse prismatic structure;
<br />slightly hard, very friable; some visible lime occiuing in fine to
<br />medium seams and soft masses; calcareous; moderately alkaline-,
<br />gradual smooth boundary.
<br />Cca--25 to 60 inches; very pale brown (10YR M) fine sandy loam, pale
<br />brown (10YR 6/3) moist; weak coarse subangular blocky structure;
<br />slightly hard, very friable; some visible time in fine to medium
<br />threads and seams; calcareous; moderately alkaline.
<br />Thickness of the solum ranges from 17 to .30 inches. Coarse fragments
<br />make up as much as 15 percent of the solum. Depth to free carbonates
<br />ranges from 10 to 24 inches.
<br />'rhe A horizon has hue of 10Y K or 2.5Y value of 5 or 6 dry and 3 to 5
<br />moist, and chroma of 2 or 3. It is fine sandy.loani or loamy sand. The
<br />132t horizon is commonly sandy clay loam, but clay content ranges from
<br />18 to 30 percent.
|