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<br />Thedalund series
<br />SOIL SURVEY
<br />The Thedalund series consists of moderately deep, well
<br />drained soils that formed in residuum from soft: calcare-
<br />ous shale. Thedalund soils are on plains. Slopes are 1 to 9
<br />percent.
<br />Thedalund soils are similar to Kim, Nelson, Otero, Shin-
<br />gle, and Tassel soils and are near the Olney and Terry
<br />soils. Kim, Otero, and Olney soils are deep. Nelson and
<br />Tassel soils are less than 18 percent clay in the. C horizon.
<br />Terry soils have a B2t horizon that is less than 18 percent
<br />clay. Shingle soils have shale between 10 and 20 inches.
<br />Typical pedon of Thedalund loam, 3 to 9 percent slopes,
<br />2,050 feet north and 1,800 feet east of southwest, corner
<br />sec. 29, T. 7 N., R- 65 W.
<br />Ap-0 to 8 inches- brown (10YR 5/3) loarn, dark brown (IOYR 4/3)
<br />moist; moderate fine granular structure; slightly hard, friable; 5
<br />percent, shale chips; calcareous; moderately alkaline; abrupt smooth
<br />boundary.
<br />C,lea-8 to 12 inches; pale brown (10YR 6/3) loam, brown (IOYR 5/3)
<br />moist; weak fine granular st.nrcture.; slightly hard, friable; some
<br />visible lime in medium soft masses; calcareous; moderately alkaline;
<br />clear smooth boundary.
<br />C2ca-12 to 25 inches; very pale brown (IOYR 7/4) loam stratified with
<br />thin lenses of shale, light yellowish brown (10YR 6/4) moist; mas-
<br />sive; slightly hard, friable; some visible lime occuring in medium
<br />soft masses; calcareous; moderately alkaline- abrupt smooth bounda-
<br />ry
<br />Cdr-25 inches; soft calcareous shah:.
<br />Typically these soils have free carbonates at the surface. Depth to
<br />shale ranges from 20 to 40 inches- Content of rock fragments ranges
<br />from 0 to 15 percent.
<br />The A horizon has hue of 10YR or 2.5Y, value of 5 or 6 dry and 4 or 5
<br />moist, and chroma of 2 or 3. The C horizon has hue of IOYR or 2.5Y. It
<br />is loam or clay loam that is 18 to 35 percent clay.
<br />Ulm series
<br />The Ulm series consists of deep, well drained soils that
<br />formed in calcareous alluvial and eolian sediments from
<br />shale. Ulm soils are on plains. Slopes are 0 to 5 percent..
<br />Ulm soils are similar to the Fort Collins, Renohill, and
<br />Wiley soils and are near the Heldt and Nunn soils. Fort
<br />Collins and Wiley soils are less than 35 percent clay in
<br />the R2t horizon. Renohill soils have shale between 20 and
<br />40 inches- Heldt soils lack a 132t horizon. Nunn soils have
<br />a dark colored surface layer.
<br />Typical pedon of Ulm clay loam, 0 to 3 percent slopes,
<br />1,370 feet north and 240 feet west of southeast corner
<br />sec. 33, T. 1 N., R. 68 W.
<br />Ap-0 to 5 inches; brown (10YR 513) clay loam (lark grayish brown
<br />(10YR 4/2) moist; moderate fine granular structure; slightly hard,
<br />firm; calcareous; mildly alkaline; abrupt smooth boundary.
<br />132t-b to 13 inches; brown (10YR 5/3) clay, dark grayish brown UOYR
<br />4/2) moist; weak coarse angular blocky structure parting to
<br />moderate medium angular blocky; extremely hard, extremely firm;
<br />common moderately thick clay, films on faces of peds; calcareous;
<br />mildly alkaline; clear smooth boundary.
<br />B3ca-13 to 19'inches; pale bmwn (10YR 6/3) clay, brown (10YR 5/3)
<br />moist; weak coarse angular blocky structure; extremely hard, ex-
<br />tremely firm; few thin clay films on faces of some peds; some visi-
<br />ble lime in fine seams; calcareous; moderately alkaline; gradual
<br />smooth boundary.
<br />Cto 84 inches; very pale brown (10YR 7/3) clay, pale brown
<br />00YR 613) moist; weak coarse subangular blocky structure; ex-
<br />tremely hard, very firm; some visible lime occuring in medium soft
<br />masses; calcareous; moderately alkaline; gradual smooth boundary.
<br />C2ca--34 to 60 inches; very pale brown (10YR 7/3) clay loam, pale
<br />brown (IOYR 6/3) moist; weak coarse subangular blocky structure;
<br />very hard, firm; some visible lime oecuring in medium soft. masses;
<br />calcareous; moderately alkaline.
<br />Thickness of the solum ranges from 15 to 36 inches. Rork fragments
<br />make up 0 to 6 perent of the solum.
<br />The A horizon has hue of 10YR or 2.5Y, value of '5 or 6 dry art(] 4 or 5
<br />moist, and chroma of 2 or 3. The 62t horizon is commonly clay that is 40
<br />to 50 percent clay.
<br />Valent series
<br />The Valent seties. consists of deep, excessively drained
<br />soils that formed in eolian deposits- Valent soils are on
<br />plains. Slopes are 0 to 9 percent.
<br />Valent soils are near the Loup, Boel, Osgood, and Vona
<br />soils- Loup and Boel soils are poorly drained. Osgood and
<br />Vona soils have a B horizon.
<br />Typical pedon of Valent sand, 0 to 3 percent slopes,
<br />2,220 feet north and 132 feet west of southeast corner
<br />sec. R, T. 4 N., R- 62 W-
<br />Al -0 to 8 inches; brown (lOYR 5/3) sand, dark grayish brown (10YR
<br />412) moist; single grained; loose; neutral; clear smooth boundary-
<br />CI-8 to 60 inches; brown (IOYR 5/3) sand, dark grayish brown (10YR
<br />412) moist; single grained; loose; neutral.
<br />Coarse fragments make up 0 Iq 10 percent of the solum and are
<br />mainly scattered gravel. Depth to free carbonates is more than 40
<br />inches.
<br />The A horizon has hue of IOY R and 2.5Y, value of 5 or 6 dry and 3 to
<br />5 moist, and chroma of2 or 3.
<br />Vona series
<br />The Vona series consists of deep, well drained to
<br />somewhat excessively drained soils that formed in eolian
<br />or alluvial deposits. Vona soils are on plains and high ter-
<br />races. Slopes are 0 to 9 percent.
<br />Vona soils are similar to the Olney and Terry soils and
<br />are near the Ascalon, Bresser, Julesburg, Osgood, Otero,
<br />and Valent soils. Olney, Ascalon, and Bresser soils are
<br />more than 18 percent clay in the 132t horizon. Terry soils
<br />have sandstone between 20 and 40 inches. Julesburg soils
<br />have a dark colored surface layer. Osgood soils have an A
<br />horizon that is coarser than loamy fine sand and is more
<br />than 20 inches thick- Otero and Valent soils lack a A
<br />horizon.
<br />Typical pedon of Vona loamy sand, 0 to 3 percent
<br />slopes, 180 feet north and 1,400 feet cast of southwest
<br />corner sec. 25, T. 5 N., R. 61 W.
<br />Al-0 to 6 inches; grayish brown (10YR 5/2) loamy sand, dark grayish
<br />brown (10YR 4/2) moist; weak fine granular structure; soft, very
<br />friable; neutral; clear smooth boundary.
<br />A3--6 to 12 inches; grayish brown (10YR 512) fine sandy loam, dark
<br />grayish brown (10YR 4/2) moist; weak coarse subangular blocky
<br />structure; slightly hard, very friable; neutral; clear smooth bounda-
<br />ry-
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