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WELD COUNTY, COLORADO, SOUTHERN PART
<br />parting to moderate fine angular blocky; extremely hard, very firm;
<br />common moderate thick clay films on faces of peds; noncaleareous-,
<br />mildly alkaline; clear smooth boundary.
<br />B3ca-21 to 27 inches; grayish brown (10YR 5/2) clay loam, dark grayish
<br />brown (10YR 4/2) moist; weak medium prismatic structure; ex-
<br />tremely hard, very firm; few thin clay films on faces of pods; 10
<br />percent gravel; some visible lime oectuinR in fine soft masses; ca1-
<br />careous; mildly alkaline; clear wavy boundary.
<br />IIC-27 to 60 inches; pale brown (10YR 6/3) very gravelly sand, brown
<br />00YR 5/3) moist; single grained; loose; 50 percent gravel; calcare-
<br />ous; mildly alkaline.
<br />Thickness of the solum ranges from 16 to 40 inches. Coarse fragments
<br />make up less than 10 percent of the solum. Depth to contrasting materi-
<br />al ranges from 22 to 34 inches.
<br />The A horizon has hue of 10YR or 2.5Y, value of 4 or 5 dry and 2 or 3
<br />moist, and chroma of 2 or 3. The B2t horizon is commonly heavy clay
<br />loam that is IS to 40 percent clay.
<br />Fort Collins series
<br />The Fort Collins series consists of deep, well drained
<br />soils that formed in alluvium. Fort Collins soils are on
<br />smooth plains and high terraces. Slopes are 0 to 3 per-
<br />cent.
<br />Fort Collins soils are similar to the Olney soils and are
<br />near the Kim and Nunn soils. Olney soils are more than
<br />35 percent fine and coarser sand in the B and C horizons.
<br />Kim soils lack a R horizon. Nunn soils are more than 35
<br />percent clay in the 132t horizon
<br />Typical pedon of Fort Collins loam, 1 to 3 percent
<br />slopes, 2,510 feet south and 1,500 feet west of northeast
<br />corner sec. 17, T. 6 N., R. 66 W.
<br />Ap-o to 7 inches; grayish brown (10YR 50 loam, dark grayish brown
<br />(10YR 4/2) moist; weak medium granular structure; slightly hard,
<br />f iahle; noncalcareous; mildly alkaline; abrupt smooth boundary.
<br />B2t-7 to 11 inches; brown 00YR 5/3) clay loam, dark brown (10YR 4/3)
<br />moist; moderate mediurn prismatic structure. parting to moderate to
<br />weak medium subangular blocky; hard, firm; common thin clay films
<br />on faces of peds; noncalcareous; mildly alkaline; clear smooth boun-
<br />dary.
<br />Baca--11 to 24 inches; very pale brown (10YR 7/3) loam, brown (10YR
<br />5f3) moist; weak coarse prismatic structure; slightly hard, friable;
<br />few thin clay films on some faces of peds; some visible lime in tine
<br />filaments or threads; calcareous; moderately alkaline; gradual wavy
<br />boundary.
<br />Cca -L4 to 60 inches; very pale brown (10YR 7/3) fine sandy loam,
<br />brown (10YR 5/3) moist; weak coarse subangular blocky structure;
<br />soft, friable; some visible lime occuring as medium seams; calcare-
<br />ous; moderately alkaline.
<br />Thickness of the solum ranges from 1R to 30 inches. Coarse fragments
<br />make up 0 to 5 percent of the solumt. Depth to free carbonates ranges
<br />from 8 to 20 inches.
<br />The A horizon has value of 5 or 6 dry and 4 or 5 moist and chroma of
<br />2 or 3. The 132t horizon is commonly clay loam that is 28 to 35 percent
<br />clay.
<br />Haverson series
<br />The Haverson series consists of deep, well drained soils
<br />that formed in stratified recent loamy alluvium. Haverson
<br />soils are on low terraces and flood plains. Slopes are 0 to
<br />3 percent.
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<br />Haverson soils are similar to the Bankard soils and are
<br />near the Colombo and Nunn soils. Bankard soils are
<br />sandy in the C horizon. Colombo and Nunn soils have a
<br />dark colored surface layer.
<br />Typical pedon of Haverson loam, 1 to 3 percent slopes,
<br />880 feet south and 1,140 feet west of northeast corner
<br />sec. 29, T. 2 N., R. 61 W.
<br />AI ---0 to 4 inches; grayish brown (10YR 5/2) loam, dark grayish brown
<br />(IOYR 412) moist; weak fine granular stmeture; slightly hard, very
<br />friable; neutral; clear smooth boundary.
<br />CI---4 to 25 inches; pale brown (10YR 6/3) loam stratified with thin len-
<br />ses of loamy sand and clay loam, dark grayish brown (10YR 4/2)
<br />moist; moderate fine platy structure.; slightly hard, very friable; cal-
<br />careous; mildly alkaline; gradual wary boundary.
<br />C2-25 to CA) inches; pale brown (MYR 6/3) loam, dark grayish brown
<br />00YR 4/2) moist; massive; soft, very friable; calcareous; moderately
<br />alkaline.
<br />CAmr,e fragments make up 0 to 5 percent of the soil The A horizon
<br />has value of 5 or 6 dry and 4 or 5 moist and chroma of 2 or 3. The C
<br />horizon is commonly loam stratified with thin lenses of loamy sand to
<br />clay loam.
<br />Ileldt series
<br />The Heldt series consists of deep, moderately well
<br />drained soils that formed in alluvial sediment derived
<br />from shale. Heldt soils are on plains. Slopes are I to 5
<br />percent..
<br />Heldt soils are near the Colby, Ulm, Weld, and Wiley
<br />soils. Colby soils lack a B horizon. Ulm, Weld, and Wiley
<br />soils have a B2t horizon.
<br />Typical pedon of Heldt silty clay, I to 3 percent slopes,
<br />270 feet north and 2,785, feet west of southeast corner
<br />sec. 32, T. 3 N., lt. 68 W.
<br />Ap-0 to 4 inches; light. brownish gray (2.5Y 6/2) silty clay, grayish
<br />brown (2.5Y 5/2) moist; strung fine granular structure; slightly
<br />hard, friable; calcareous; moderately alkaline; abrupt smooth boun-
<br />dary.
<br />A12--4 to 7 inches; light yellowish brown (2.5Y 6/4) silty clay, olive
<br />hrown (2.5Y 414) moist; massive; extremely hard, very firm; calcare-
<br />ous; moderately alkaline; clear smooth boundary.
<br />112--7 to 25 inches; light brownish gray (2-5Y 612) silty clay, olive brown
<br />(2.5Y 4/4) moist; moderate medium prismatic structure parting to
<br />moderate fine angular blocky; extremely hand, very firm; common
<br />shiny slickensides; calcareous; moderately alkaline; clear wavy boun-
<br />dary.
<br />13ac:a--G`i to 34 inches; light brownish gray (2.5Y 6/2) silty clay, fight
<br />olive brown (,.M 5/4) moist; weak medium prismatic structure
<br />parting to moderate to weak fine angular blocky; extremely hand,
<br />very firm; some visible time in fire filaments or threads; calcareous;
<br />strongly alkaline; gradual smooth boundary.
<br />C _"A to 60 inches; light brownish gray MASY 6/2) silty clay, light olive
<br />brown (2 SY 5/4) moist; weak medium subangular blocky structure;
<br />extremely hard, very firm; calcareous; strongly alkaline.
<br />Thickness of the ;olum ranges from 21 W 4N inches. Typically these
<br />soils have fro carbonates at the surface.. Cracks 1/2 inch or more wide
<br />usually appear when the soil is dry.
<br />The A horizon has hue of 10YR or 2.5Y and value of 6 or 7 dry and 4
<br />to () moist. The 132 horizon is commonly silty clay that is 40 to 50 per-
<br />cent clay-
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