LOCATION FLINTCREEK MTEstablished Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, frigid Cumulic Endoaquolls
TYPICAL PEDON: Flintcreek loam, in pasture (colors are for moist colors unless otherwise noted).
Oi--0 to 2 inches; decomposed organic matt.
A--2 to 14 inches; very dark gray (10YR 3/1) loam, dark gray (10YR 4/1) dry; many very fine and fine distinct brownish yellow (10YR 6/8) redox concentrations; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine interstitual pores; neutral (pH 6.6); gradual wavy boundary. (10 to 15 inches thick)
Bg--14 to 26 inches; black (10YR 2/1) stratified gravelly loam and gravelly silt loam, dark gray (10YR 4/1) dry; many very fine distinct brownish yellow (10YR 6/8) redox concentrations; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; few very fine interstitial pores; 5 percent cobbles and 10 percent pebbles; neutral (pH 6.6); clear smooth boundary. (10 to 25 inches thick)
2Cg--26 to 60 inches; very dark grayish brown (10YR 3/2) extremely gravelly loamy sand, gray (10YR 5/1) dry; many very fine distinct brownish yellow (10YR 6/8) redox concentrations; single grain; loose, nonsticky and nonplastic; common very fine roots; 15 percent cobbles and 45 percent pebbles; neutral (pH 6.8).
TYPE LOCATION: Granite County, Montana; 1,000 feet east and 2,300 feet north of the SW corner of sec. 26, T. 6 N., R. 14 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 41 to 46 degrees F.
Moisture control section - between 4 and 12 inches.
Mollic epipedon thickness - 24 to 60 inches.
Depth to 2Cg horizon - 20 to 40 inches.
Depth to seasonal high water table - 0 to 12 inches.
A horizon - Value: 4 or 5 dry; 2 or 3 moist
Chroma: 1 or 2
Clay content: 18 to 27 percent
Redox concentrations: common to many distinct or prominent 10YR 5/8, 10YR 6/8, 10YR 5/6, or 10YR 6/6
Rock fragments: 0 to 15 percent; 0 to 5 percent cobbles; 0 to 10 percent pebbles
Reaction: pH 6.6 to 7.3
Bg horizon - Value: 4 or 5 dry, 2 or 3 moist
Chroma: 1 or 2
Texture: loam, silt loam, sandy loam or clay loam
Clay content: 18 to 35 percent
Redox concentrations: common to many distinct or prominent 10YR 5/8, 10YR 6/8, 10YR 5/6, or 10YR 6/6
Rock fragments: 15 to 35 percent; 5 to 10 percent cobbles; 10 to 25 percent pebbles
Reaction: pH 6.6 to 7.3
2Cg horizon - Value: 4, 5 or 6 dry, 3, 4 or 5 moist
Chroma: 1 or 2
Texture: loamy sand or sand
Clay content: 5 to 15 percent
Redox concentrations: common to many, distinct or prominent 10YR 5/8, 10YR 6/8, 10YR 5/6, or 10YR 6/6
Rock fragments: 50 to 80 percent--10 to 20 percent cobbles, 40 to 60 percent pebbles
Reaction: 6.6 to 7.3
COMPETING SERIES:
Degarmo (OR) - is poorly or somewhat poorly drained with the water table at a depth of 1 to 2.5 feet from the surface.
Dula (NM) is poorly drained with the water table at a depth of 1 to 3.5 feet from the surface.
GEOGRAPHIC SETTING:
Landform - glacial outwash plains, stream terraces and flood plains.
Elevation - 3,600 to 6,200 feet.
Slope - 0 to 2 percent.
Parent material - alluvium .
Climate - long, cold winters; moist springs; warm summers.
Mean annual precipitation - 10 to 19 inches.
Mean annual air temperature - 39 to 44 degrees F.
Frost-free period - 70 to 105 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the Nythar soil which is fine-loamy and on similar landform positions.
DRAINAGE AND PERMEABILITY: Very poorly drained, moderate permeability above the 2C horizon, very rapid below.
USE AND VEGETATION: Flintcreek soils are primarily used for pasture and wildlife habitat. The potential native vegetation is mainly tall reedgrass, tufted hairgrass, blue-eye grass and willows.
DISTRIBUTION AND EXTENT: Flintcreek soils are inextensive in western Montana valleys.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Granite County, Montana, 1997.
REMARKS: Soil interpretive record: MT1597. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from 2 to 60 inches (A, Bg, 2Cg horizons); a particle-size control from 12 to 42 inches (A, Bg and 2Cg horizons). Flintcreek soils have a frigid temperature regime and an aquic moisture regime.