LOCATION LEAVITTVILLE WY+ID
Established Series
Rev. AJC-KTS-RJS
04/2011
LEAVITTVILLE SERIES
The Leavittville series consists of very deep, well drained soils that formed in eolian deposits over alluvium. These soils occur on alluvial fans. Slopes range from 0 to 15 percent. The mean annual precipitation is about 18 inches.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Leavittville loam, grassland (colors are for dry soil unless otherwise stated).
A1--0 to 11 inches; brown (7.5YR 5/2) loam, very dark brown (7.5YR 2/2) moist; moderate medium subangular blocky structure that parts to moderate medium granular structure; soft, very friable; slightly effervescent; moderately alkaline (pH 8.0); gradual wavy boundary. (8 to 12 inches thick)
A2--11 to 22 inches; brown (7.5YR 5/2) silt loam, dark brown (7.5YR 3/2) moist; moderate fine prismatic structure that parts to moderate medium subangular blocky structure; hard, very friable; few thin patchy clay films on some vertical faces of peds; 5 percent gravel; strongly effervescent; moderately alkaline (pH 8.3); gradual wavy boundary. (8 to 18 inches thick)
Bk--22 to 28 inches; pinkish gray (7.5YR 6/2) silt loam, brown (7.5YR 4/2) moist; weak medium subangular blocky structure; hard, very friable; common secondary calcium carbonate visible in concretions and in thin seams and threads; violently effervescent; moderately alkaline (pH 8.3); gradual wavy boundary. (4 to 10 inches thick)
2BCk--28 to 60 inches; pinkish gray (7.5YR 6/2) very gravelly loam, brown (7.5YR 4/2) moist; massive; hard, very friable; common secondary calcium carbonate visible in concretions and thin seams and threads, and common calcium carbonate coatings on gravel; violently effervescent; moderately alkaline (pH 8.3).
TYPE LOCATION: Lincoln County, Wyoming; 100 feet north and 800 feet east of the southwest corner of sec. 27, T. 32N, R. 119W.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon: 16 inches or more
Organic carbon content in mollic epipedon: 0.8 and 2 percent and decreases regularly as depth increases
Depth to secondary calcium carbonate accumulation: 16 to 30 inches
Depth to lithologic discontinuity - 20 to 40 inches
Base saturation: 90 to 100 percent
Control section (weighted average):
18 to 35 percent clay
Note: Some pedons may have a cambic horizon
A1, A2 horizons
Hue: 10YR or 7.5YR; dry or moist
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Texture: silt loam or loam
Clay content: 18 and 35 percent
Silt content: 30 to 60 percent
Sand content: 15 to 45 percent sand and less than 15 percent fine and coarser sand
Rock fragments: 0 to 15 percent
Reaction: pH 7.2 to 8.4
Note: Typically, the A horizons have granular structure in the upper part, and prismatic or blocky structure in the lower part.
Bw horizons (when present)
Hue: 10YR, 7.5YR or 5YR; dry or moist
Value: 5 or 6 dry; 3 or 4 moist
Chroma: 2 to 4; dry or moist
Texture: silt loam or loam
Clay content: 18 and 35 percent
Rock fragments: 0 to 15 percent
Reaction: pH 7.2 to 8.4
Note: The Bw horizon typically has prismatic or subangular blocky structure.
Bk horizon
Hue: 10YR or 7.5YR; dry or moist
Value: 5 or 6 dry; 3 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: silt loam or loam
Clay content: 18 and 35 percent
Rock fragments: 0 to 15 percent
Calcium carbonate equivalent: 1 to 5 percent
Reaction: pH 7.9 to 8.5
2BCk
Hue: 10YR or 7.5YR; dry or moist
Value: 5 or 6 dry; 3 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: loam or sandy loam
Clay content: 10 to 18 percent
Rock fragments: 35 to 75 percent
Calcium carbonate equivalent: 1 to 5 percent
Reaction: pH 7.9 to 8.5
COMPETING SERIES:
Adel (MT) - does not have secondary calcium carbonate accumulation
Argee (NV) - are moderately deep to paralithic contact
Bullbasin (CO) - are deep to lithic contact
Duff (NV) - are deep to lithic contact
Hackwood (NV) - does not have secondary calcium carbonate accumulation
Houlihan (MT) - does not have secondary calcium carbonate accumulation
Lamphier (CO) - does not have secondary calcium carbonate accumulation
Lespate (CO) - are moderately deep to lithic contact
Ohbejoyful (CO) - does not have secondary calcium carbonate accumulation
Osmund (WY) - does not have a lithologic discontinuity
Pavohroo (ID) - have a xeric moisture regime
Rhone (CO) - are deep to lithic contact
Secondset (CO) - are moderately deep to lithic contact
Strickland (NV) - are moderately deep to lithic contact
Taterheap (CO) - does not have secondary calcium carbonate accumulation
Winevada (CO) - are moderately deep to lithic contact
GEOGRAPHIC SETTING:
Landform - alluvial fans
Slope - 0 to 15 percent
Parent material - eolian deposits over alluvium
Mean annual precipitation - 15 to 24 inches with the largest amount of precipitation falling during spring and summer
Frost-free season - 30 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used both as dry and irrigated cropland and as native pastureland. Principal native vegetation is blue grama, western wheatgrass, and sage.
DISTRIBUTION AND EXTENT: Mountains of western Wyoming. The series is of moderate extent. MLRAs - 43B, 48A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: The soil Survey of the Star Valley Soil Conservation District, Lincoln County, Wyoming, 1942.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 0 to 22 inches (A1, A2)
Secondary calcium carbonate accumulation - from 22 to 60 inches (Bk, 2BCk)
Lithologic discontinuity - at 28 inches (2BCk)
Particle-size control section - from 10 to 40 inches (part of A1, A2, Bk, part of BCk)
Leavittville soils have a cryic temperature regime and an ustic moisture regime.
National Cooperative Soil Survey
U.S.A.