LOCATION COLAKE MTEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Typic Calciaquolls
TYPICAL PEDON: Colake silt loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 10 inches; dark gray (10YR 4/1) silt loam, black (10YR 2/1) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many fine roots; many fine pores; disseminated lime, strongly effervescent; moderately alkaline (pH 8.2); gradual irregular boundary. (8 to 16 inches thick)
Bkg--10 to 19 inches; gray (10YR 6/1) silt loam, very dark gray (10YR 3/1) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; common fine pores; disseminated lime, violently effervescent; moderately alkaline (pH 8.4); clear irregular boundary. (6 to 15 inches thick)
Cg--19 to 60 inches; light gray (5Y 7/1) silt loam, light brownish gray (2.5Y 6/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few fine roots; few fine pores; disseminated lime, violently effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Lake County, Montana; 100 feet south and 800 feet west of the NE corner of sec. 35, T. 21 N., R. 20 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 44 to 47 degrees F.
Moisture control section - between 4 to 12 inches.
Mollic epipedon thickness - 7 to 16 inches.
Depth to water table - 12 to 24 inches.
Depth to calcic horizon - 8 to 16 inches.
Soil phases - drained.
A horizon - Hue: 10YR, 2.5Y, or 5Y
Value: 3 or 4 dry; 2 or 3 moist
Clay content: 18 to 27 percent
Calcium carbonate equivalent: 5 to 10 percent
Reaction: 7.4 to 8.4
Bkg horizon - Hue: 10YR, 2.5Y, 5Y
Value: 5, 6, 7, or 8 dry; 3, 4, 5, or 6 moist
Chroma: 1 or 2
Clay content: 18 to 27 percent
Calcium carbonate equivalent: 15 to 40 percent
Reaction: 7.4 to 8.4
Cg horizon - Hue: 2.5Y or 5Y
Value: 5, 6, or 7 dry; 3, 4, 5, or 6 moist
Chroma: 1, 2, 3, or 4
Clay content: 18 to 27 percent
Calcium carbonate equivalent: 10 to 30 percent
Reaction: 7.4 to 8.4
COMPETING SERIES:
Bear Lake (ID) - have redox concentrations above a depth of 40 inches.
Colvin (ND) - have redox concentrations above a depth of 40 inches
Nielsville (MN) - have redox concentrations above a depth of 40 inches; has a lithologic discontinuity of clay or silty clay below 40 inches.
Ojata (ND) - have redox concentrations above a depth of 40 inches; have EC of more than 16 mmhos/cm in the upper horizons.
Regan (ND) - have a lithologic discontinuity above a depth of 40 inches.
Winger (MN) - have a lithologic discontinuity above a depth of 40 inches.
GEOGRAPHIC SETTING:
Landform - drainageways and closed depressions on glaciated uplands.
Elevation - 2,700 3,600 feet.
Slope - 0 to 3 percent.
Parent material - calcareous alluvium.
Climate - long, cold winters; moist springs; warm summers.
Mean annual precipitation - 15 to 18 inches.
Mean annual air temperature - 42 to 45 degrees F.
Frost-free period - 105 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Poorly drained; moderate permeability.
USE AND VEGETATION: This soil is used for pasture, rangeland, and hayland. Potential native vegetation is mainly tall reedgrass, mannagrass, tufted hairgrass, and sedges.
DISTRIBUTION AND EXTENT: This soil is of small extent in western Montana.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Lake County, Montana, 1991; proposed Lake County, Montana, 1990.
REMARKS: Soil Interpretation Record: MT1244, MT1245. Diagnostic horizons and features recognized in this soil are: a mollic epipedon from the soil surface to 10 inches (A horizon); a calcic horizon from 10 to 19 inches (Bkg horizon); a particle size control section from 10 to 40 inches (Bkg and Cg horizons). Colake soils have a frigid temperature regime and an aquic moisture regime.