LOCATION MANNIXLEE MT
Established Series
Rev. HAL-KTS-EMM
10/2014
MANNIXLEE SERIES
The Mannixlee series consists of very deep, poorly drained soils that formed in alluvium. These soils occur on stream terraces, depressions and flood plains. Slopes are 0 to 4 percent. Mean annual precipitation is about 14 inches, and mean annual air temperature is about 43 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Cumulic Endoaquolls
TYPICAL PEDON: Mannixlee clay loam, in pasture (colors are for moist soil unless otherwise noted).
Oi--0 to 2 inches; partially decomposed organic matter. (0 to 3 inches thick)
A1--2 to 9 inches; very dark gray (10YR 3/1) clay loam, dark gray (10YR 4/1) dry; common medium prominent brown (7.5YR 4/4) redox concentrations; moderate medium granular structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular and discontinuous irregular pores; neutral (pH 7.2); gradual smooth boundary.
A2--9 to 16 inches; very dark gray (10YR 3/1) clay loam, dark gray (10YR 4/1) dry; moderate medium subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine tubular pores and many very fine discontinuous irregular pores; neutral (pH 7.2); gradual smooth boundary.
A3--16 to 25 inches; very dark gray (10YR 3/1) loam, dark gray (10YR 4/1) dry; common medium prominent brown (7.5YR 4/4) redox concentrations; moderate medium subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; few fine tubular pores, and few very fine and fine discontinuous irregular pores; neutral; (pH 7.2); gradual smooth boundary. (combined thickness of the A horizons - 21 to 35 inches)
Bw--25 to 45 inches; very dark gray (10YR 3/1) loam, dark gray (10YR 4/1) dry; many medium prominent brown (7.5YR 4/4) redox concentrations; weak medium subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few fine tubular pores, and common very fine and fine discontinuous irregular pores; neutral (pH 6.6); abrupt smooth boundary. (19 to 35 inches thick)
2Cg--45 to 60 inches; grayish brown (10YR 5/2) extremely cobbly loamy coarse sand, light brownish gray (10YR 6/2) dry; single grain; loose, nonsticky and nonplastic; 30 percent gravel and 35 percent cobbles; neutral (pH 7.2). (6 to 35 inches thick)
TYPE LOCATION: Granite County, Montana; 1,100 feet north and 300 feet east of the SW corner of sec. 28, T. 10N, R. 13W.
RANGE IN CHARACTERISTICS:
Soil temperature - 41 to 47 degrees F.
Depth to seasonal high water table - 12 to 24 inches
Mollic epipedon thickness - 25 to 43 inches
Depth to lithologic discontinuity - 40 to 60 inches
A1, A2, A3 horizons
Value: 2 or 3 moist; 3 to 5 dry
Chroma: 1 or 2; dry or moist
Texture: loam or clay loam
Clay content: 18 to 35 percent
Reaction: pH 6.6 to 7.3
Bw horizon
Hue: 10YR, 2.5Y or 5Y; dry or moist
Value: 2 or 3 moist; 3 to 5 dry
Chroma: 1 or 2; dry or moist
Texture: loam, clay loam, silty clay loam, silt loam, sandy loam
Clay content: 10 to 35 percent
Rock fragments: 0 to 30 percent--0 to 20 percent gravel, 0 to 10 percent cobbles
Reaction: pH 6.6 to 7.3
2Cg horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 5 to 7 moist; 6 to 8 dry
Chroma: 1 to 3; dry or moist
Texture: loamy coarse sand or coarse sand with thin layers of loam, sandy loam, silt loam or clay loam
Clay content: 5 to 30 percent
Rock fragments: 15 to 70 percent--10 to 45 percent gravel, 5 to 40 percent cobbles
Reaction: pH 6.6 to 7.3
COMPETING SERIES:
Chamita (NM) - does not have a lithologic discontinuity
Cometcrik (MT) - have a Cg horizon
Eagleton (MT) - does not have a lithologic discontinuity
Eastdale (CO) - does not have a lithologic discontinuity
Eastwalker (CA) - does not have a Bw horizon
Kerkhoven (MN) - does not have a lithologic discontinuity
Kovich (UT) - have a lithologic discontinuity at depths of less than 40 inches
Lakepark (MN) - does not have a lithologic discontinuity
Lobe (CO) - have less than 15 percent rock fragments in the lithologic discontinuity
Marshbrook (SD) - does not have a lithologic discontinuity
Marshdale (ID) - have Bg horizons
Nohope (CA) - have carbonates in the upper part of the A horizons
Nythar (MT) - does not have a lithologic discontinuity
Sibannac (OR) - have less than 15 percent rock fragments in the lithologic discontinuity
Welch (NV) - does not have a lithologic discontinuity
GEOGRAPHIC SETTING:
Landform - stream terraces, depressions and flood plains
Elevation - 3,800 to 6,700 feet
Slope - 0 to 4 percent
Parent material - alluvium
Climate - long, cold winters; moist springs; warm summers
Mean annual precipitation - 10 to 19 inches, much of which falls as snow or as spring rain
Mean annual temperature - 39 to 45 degrees F.
Frost-free period - 70 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Poorly drained; moderately slow over rapid permeability.
USE AND VEGETATION: Mannixlee soils are used mainly for pasture and hayland. The native vegetation is willow, sedges, rushes, and tufted hairgrass.
DISTRIBUTION AND EXTENT: Mannixlee soils are of small extent in southwestern Montana. MLRAs - 43B, 44B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Granite County, Montana, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 2 to 45 inches (A1, A2, A3, Bw horizons)
Lithologic discontinuity at - 45 inches (2Cg horizon)
Particle-size control section - from 12 to 42 inches (part of A2, A3, part of Bw horizons)
Mannixlee soils have a frigid temperature regime and an aquic moisture regime.
ADDITIONAL DATA: Soil interpretation record - MT1399.
National Cooperative Soil Survey
U.S.A.