LOCATION MCLANGOR MTEstablished Series
TAXONOMIC CLASS: Loamy, mixed, euic, frigid Terric Haplohemists
TYPICAL PEDON: McLangor mucky peat, on a nearly level, smooth floodplain, wet meadow hayland (Colors are for moist soil).
Oe1--0 to 8 inches; black (10YR 2/1) broken face and rubbed mucky peat (hemic material); about 70 percent fiber and raw herbaceous plant material, about 30 percent rubbed; nonsticky and nonplastic; herbaceous fiber, mostly residue from Phragmites arundinacea; many very fine and fine roots; slightly acid (pH 6.2); gradual smooth boundary.
Oe2--8 to 17 inches; black (10YR 2/1) broken face and rubbed mucky peat (hemic material); about 50 percent fiber, about 20 percent rubbed; nonsticky and nonplastic; herbaceous fiber; common very fine and fine roots; slightly acid (pH 6.4); clear smooth boundary. (Combined thickness of the Oi1 and Oi2 horizons is 16 to 34 inches).
C1--17 to 20 inches; stratified (1/4 to 1/2 inch) very dark gray (10YR 3/1) mucky silt loam (50 percent), dark gray (10YR 4/1) silt loam (40 percent), and black (10YR 2/1) mucky silt loam (10 percent); massive; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; neutral (pH 6.6); abrupt smooth boundary. (2 to 11 inches thick)
C2--20 to 36 inches; stratified (1/4 to 1/2 inch) light gray (10YR 7/2) silt and very fine sandy loam; massive; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; neutral (pH 6.8); abrupt wavy boundary. (10 to 28 inches thick)
C3--36 to 42 inches; stratified (1/4 to 3/4 inch) very dark gray (10YR 3/1) mucky silt loam (60 percent), dark gray (10YR 4/1) silt loam (30 percent), and black (10YR 2/1) mucky peat (10 percent); massive; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; slightly acid (pH 6.2); clear wavy boundary. (0 to 6 inches thick)
Oa--42 to 54 inches; black (10YR 2/1) broken face and rubbed muck (sapric material); about 30 percent fiber, about 5 percent rubbed; massive; nonsticky and nonplastic; herbaceous fiber; common very fine and fine roots; moderately acid (pH 5.8); abrupt wavy boundary. (0 to 12 inches thick)
Cg--54 to 70 inches; stratified (1/4 to 1/2 inch) gray (5Y 6/1) silt and silt loam; massive; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; moderately acid (pH 5.8).
TYPE LOCATION: Flathead County, Montana; 1,900 feet north and 300 feet east of the southwest corner of section 33, T. 26 N., R. 26 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 42 to 45 degrees F.
Depth to the terric feature - 16 to 34 inches.
Depth to water table - surface to 12 inches.
Depth to the Cg horizon - 38 to 54 inches
A C3 or an Oa horizon must be present.
Oe1 horizon
Value: 2 or 3
Chroma: 1 or 2
Fiber content: 40 to 70 percent unrubbed, 20 to 30 percent rubbed
Reaction: pH 5.6 to 6.5
Oe2 horizon
Value: 2 or 3
Chroma: 1 or 2
Fiber content: 40 to 60 percent unrubbed, 20 to 30 percent rubbed
Reaction: pH 5.6 to 6.5
C1 horizon
Value: 2, 3 or 4
Chroma: 1 or 2
Texture: silt loam or mucky silt loam
Clay content: 5 to 15 percent
Reaction: pH 5.6 to 7.3
C2 horizon
Hue: 10YR, 2.5Y, 5Y
Value: 7 or 8
Chroma: 1 or 2
Texture: stratified silt, very fine sandy loam, loamy very fine sand, and silt loam, averaging less than 15 percent fine sand or coarser.
Clay content: 4 to 12 percent
Reaction: pH 5.6 to 7.3
C3 horizon
Value: 2, 3 or 4
Chroma: 1 or 2
Texture: mucky silt loam or silt loam
Clay content: 5 to 15 percent
Reaction: pH 5.6 to 6.5
Oa horizon
Value: 2 or 3
Fiber content: 20 to 30 percent unrubbed, 5 to 15 percent rubbed
Reaction: pH 5.6 to 6.5
This horizon consists of sapric or hemic material.
Cg horizon
Hue: 5Y, 5GY, 5G, or 5BG
Value: 5, 6 or 7
Chroma, 5G only: 1 or 2
Texture: stratified silt, silt loam, very fine sandy loam, loamy very fine sand and very fine sand averaging less than 15 percent fine sand or coarser.
Clay content: 4 to 15 percent
Reaction: pH 5.6 to 6.5
COMPETING SERIES:
Tacoosh (MI) - contain 10 to 20 percent woody fragments in the histic epipedon.
Ventero (CO) - does not have a stratified Cg horizon.
GEOGRAPHIC SETTING:
Landform- flood plains and in depressions on outwash terraces and ground moraines.
Elevation - 2,400 to 4,000 feet.
Slopes - 0 to 2 percent.
Parent material - organic material over silty alluvium.
Climate - long, cold winters; cool, moist springs; warm summers.
Mean annual precipitation - 20 to 30 inches.
Mean annual temperature - 40 to 45 degrees F.
Frost-free period - 70 to 95 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Very poorly drained; moderate permeability.
USE AND VEGETATION: McLangor soils are used for wildlife habitat, livestock grazing, and hayland. Potential native vegetation is mainly reed canarygrass, beaked sedge, rushes, bulrushes, mannagrass, cattail, mosses, water birch, and Bebb's willow.
DISTRIBUTION AND EXTENT: McLangor soils are of limited extent in the valleys of northwestern Montana. MLRA 43A and 44A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Flathead County, Montana, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Histic epipedon - 0 to 17 inches (Oe1 and Oe2 horizons); mostly hemic organic materials;
Terric feature - 17 to 42 inches (C1, C2, and C3 horizons);
Water table at or near the surface in most years;
Particle-size control section - 0 to 52 inches (Oe1, Oe2, C1, C2, C3, Oa horizons).
McLangor soils have a frigid temperature regime and an aquic moisture regime.
ADDITIONAL DATA: Soil Interpretation Record: MT1619; Lab data pending (S94MT-029-004).