LOCATION CUJOB MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Cumulic Cryaquolls
TYPICAL PEDON: Cujob mucky silt loam, 1 to 25 percent slopes, in wet meadow rangeland. (Colors are for moist soil unless otherwise noted.)
A--0 to 4 inches; black (10YR 2/1) mucky silt loam, very dark gray (10YR 3/1) dry; weak fine granular structure; slightly hard, very friable, nonsticky and nonplastic; many very fine, and fine roots; many very fine and fine discontinous pores; 5 percent pebbles; slightly alkaline (pH 7.6); clear wavy boundary. (3 to 5 inches thick)
Bw1--4 to 11 inches; black (10YR 2/1) mucky loam, very dark gray (7.5YR 3/1) dry; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; common very fine and few medium roots; common very fine and fine discontinous pores; 10 percent pebbles; slightly alkaline (pH 7.6); clear wavy boundary. (6 to 12 inches thick)
Bw2--11 to 21 inches; black (7.5YR 2/1) very gravelly loam, dark gray (7.5YR 4/1) dry; few fine prominent yellowish brown (10YR 5/4) and light yellowish brown (10YR 6/4) dry redox concentrations; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine and few fine discontinous pores; 10 percent cobbles and 30 percent pebbles; slightly alkaline (pH 7.8); gradual wavy boundary. (8 to 11 inches thick)
C1--21 to 33 inches; reddish brown (5YR 5/4) very cobbly clay loam, light brown (7.5YR 6/3) dry; few fine distinct yellowish brown (10YR 5/4) and light yellowish brown (10YR 6/4) dry redox concentrations; massive; hard, friable, moderately sticky and moderately plastic; few very fine roots; few very fine discontinous pores; 20 percent cobbles and 30 percent pebbles; moderately alkaline (pH 8.3). (10 to 15 inches thick).
C2--33 to 60 inches; reddish brown (5YR 5/4) very cobbly clay loam, brown (7.5YR 5/3) dry; few fine distinct yellowish brown (10YR 5/4) and light yellowish brown (10YR 6/4) dry redox concentrations; massive; hard, friable, moderately sticky and moderately plastic; 25 percent cobbles and 35 percent pebbles; moderately alkaline (pH 8.3).
TYPE LOCATION: Deer Lodge County, Montana; 200 feet west and 2350 feet south of the NE corner of section 7, T. 3 N., R. 11 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 32 to 40 degrees F.
Mean summer soil temperature - 50 to 55 degrees F.
Moisture control section - between 4 and 12 inches.
Mollic epipedon thickness - 20 to 25 inches.
Depth to seasonal high water table - ponded to 12 inches.
A horizon - Value: 3 or 4 dry
Chroma: 1 or 2
Clay content: 10 to 18 percent
Rock fragments: 0 to 10 percent pebbles
Reaction: 6.6 to 7.8
Bw1 horizon - Hue: 10YR or 7.5YR
Value: 1 or 2 moist; 3 or 4 dry
Chroma: 1 or 2
Clay content: 10 to 18 percent
Rock fragments: 5 to 15 percent pebbles
Reaction: 6.6 to 7.8
Bw2 horizon - Hue: 10YR or 7.5YR
Value: 1 or 2 moist; 3 or 4 dry
Chroma: 1 or 2
Clay content: 18 to 27 percent
Rock fragments: 35 to 60 percent--5 to 15 percent cobbles; 30 to 45 percent pebbles
Reaction: 6.6 to 7.8
C1 and C2 horizons - Hue: 7.5YR or 5YR
Value: 4 or 5 moist; 5 or 6 dry
Chroma: 3 or 4
Clay content: 27 to 35 percent
Rock fragments: 35 to 60 percent; 15 to 25 percent cobbles; 20 to 35 percent pebbles
Reaction: 7.4 to 8.4
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform - Mountain slumps and depressions.
Elevation - 6,500 to 8,000 feet.
Slope - 1 to 25 percent.
Parent material - alluvium derived from mixed sources.
Climate - long, cold winters; cool, moist springs; short, cool summers.
Mean annual precipitation - 20 to 30 inches.
Mean annual air temperature - 35 to 38 degrees F.
Frost-free period - 30 to 60 days.
DRAINAGE AND PERMEABILITY: Very poorly drained, moderate permeability.
USE AND VEGETATION: Cujob soils are primarily used for wet meadow rangeland, wildlife and watershed. The potential native vegetation is mainly sedges, rushes, forbs and willows.
DISTRIBUTION AND EXTENT: Southwestern Montana. LRR E, MLRA 43. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Deer Lodge County, Montana, 1999.
REMARKS: Soil interpretation record MT1761. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the surface to 21 inches (A, Bw1, Bw2 horizons); a particle size control section from 10 to 40 inches (Bw1, Bw2, C1, C2 horizons). Cujo soils have a cryic temperature regime and an aquic moisture regime.