LOCATION COLDFEET ID+WY
Established Series
Rev. CB-RJS
04/2011
COLDFEET SERIES
The Coldfeet series consists of very deep, well drained soils that formed in colluvium derived from sandstone and quartzite. Coldfeet soils are on mountain slopes. Slopes range from 12 to 60 percent. Mean annual precipitation is about 660 mm and the mean annual air temperature is about 0.8 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Mollic Haplocryalfs
TYPICAL PEDON: Coldfeet gravelly loam, on a north facing, linear, 30 percent slope in forest at an elevation of 2,341 meters. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 3 cm; slightly decomposed plant material, dark brown (7.5YR 3/2); abrupt smooth boundary.
Oe--3 to 8 cm; dark brown (7.5YR 3/2) moderately decomposed plant material, very dark brown (7.5YR 2.5/2) moist; abrupt smooth boundary. (Combined thickness of the O horizons is 2 to 8 cm)
A1--8 to 19 cm; brown (10YR 4/3) gravelly loam, very dark brown (7.5YR 2.5/2) moist; weak medium subangular blocky structure parting to moderate fine granular; soft, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; many very fine irregular pores, and common fine tubular pores; 15 percent gravel; strongly acid (pH 5.2); clear wavy boundary. (7 to 24 cm thick)
A2--19 to 31 cm; yellowish brown (10YR 5/4) gravelly loam, dark brown (7.5YR 3/3) moist; weak medium subangular blocky structure parting to moderate fine granular; soft, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; common very fine irregular pores; 15 percent gravel; moderately acid (pH 5.6); clear wavy boundary. (0 to 17 cm thick)
E1--31 to 53 cm; very pale brown (10YR 7/3) gravelly fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine, medium, and coarse, and few fine roots; common very fine irregular and tubular pores; 15 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); gradual wavy boundary.
E2--53 to 82 cm; very pale brown (10YR 7/3) very stony fine sandy loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine irregular pores, and common very fine vesicular and tubular pores; 20 percent gravel, 10 percent cobbles and 25 percent stones; 1 percent fine prominent masses of reduced iron; moderately acid (pH 5.8); clear wavy boundary. (Combined thickness of the E horizons is 45 to 60 cm)
Bt1--82 to 112 cm; yellow (10YR 7/6) very stony silty clay loam, yellowish brown (10YR 5/6) moist; moderate medium subangular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; few fine roots; many very fine tubular pores, and common fine vesicular pores; 10 percent prominent skeletans on all faces of peds and 10 percent prominent clay films on all faces of peds; 20 percent gravel, 15 percent cobbles and 15 percent stones; 2 percent fine manganese masses; strongly acid (pH 5.4); clear wavy boundary. (18 to 30 cm thick)
Bt2--112 to 152 cm; very pale brown (10YR 7/4) extremely stony loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine and common fine tubular pores; 5 percent distinct skeletans on all faces of peds and 5 percent distinct clay films on all faces of peds; 20 percent gravel, 20 percent cobbles and 20 percent stones; strongly acid (pH 5.4)
TYPE LOCATION: Teton County, Idaho; about 6 kilometers northeast of Victor; located about 773 meters south and 194 meters west of the northeast corner of sec. 32, T. 4 N., R. 46 E.; Driggs USGS quad; lat. 46 degrees 37 minutes 44.7 seconds N. and long. 111 degrees 2 minutes 52.6 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Depth to argillic horizon: 60 to 85 cm
Particle size control section average clay: 24 to 35 percent
Particle size control section average rock fragment content: 35 to 65 percent
Reaction: pH 5.1 to 6.0
Soil moisture regime: udic
Mean annual soil temperature: 2.0 to 4.8 degrees C.; cryic soil temperature regime
Mean summer soil temperature: 4.0 to 7.0 degrees C.
A1 horizon:
Hue: 7.5YR or 10YR dry or moist
Value: 4 or 5 dry, 2.5 or 3 moist
Chroma: 3 or 4 dry, 1 to 3 moist
Rock fragments: 15 to 30 percent total; 15 to 30 percent gravel and 0 to 10 percent cobbles
Clay content: 11 to 15 percent
pH: 5.1 to 6.0
A2 horizon:
Texture: loam or silt loam
Rock fragments: 15 to 50 percent total; 15 to 30 percent gravel, 0 to 20 percent cobbles and 0 to 10 percent stones
Clay content: 11 to 15 percent
pH: 5.6 to 6.0
E1 horizon:
Texture: fine sandy loam or loam
Rock fragments: 20 to 50 percent total; 15 to 35 percent gravel, 0 to 20 percent cobbles and 0 to 15 percent stones
Clay content: 12 to 15 percent
pH: 5.6 to 6.0
E2 horizon:
Rock fragments: 50 to 70 percent total; 15 to 35 percent gravel, 5 to 20 percent cobbles and 20 to 40 percent stones
Clay content: 12 to 15 percent
pH: 5.6 to 6.0
Bt horizons:
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 4 to 6 dry or moist
Texture: silty clay loam or loam
Rock fragments: 40 to 70 percent total; 15 to 40 percent gravel, 10 to 20 percent cobbles and 10 to 30 percent stones
Clay content: 22 to 32 percent
pH: 5.1 to 6.0
COMPETING SERIES:
Dromedary (UT) - does not have stones in the particle size control section
Kingmine (UT) - has accumulations of secondary calcium carbonates
Washboard (CO) - depth to top of argillic is 58 cm or less
GEOGRAPHIC SETTING:
Parent material: colluvium derived from sandstone and quartzite
Landscape: mountains
Landform: mountain slopes
Slopes: 12 to 60 percent
Elevation: 1,867 to 2,443 meters
Mean annual air temperature: 0.5 to 2.8 degrees C
Mean annual precipitation: 533 to 914 mm
Frost-free period: 30 to 50 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Game(T)(ID) and
Mikesell series. The Game soils have a mollic epipedon and are on linear to convex northwest facing slopes. The Mikesell soils have a fine particle size class and are on linear positions.
DRAINAGE AND PERMEABILITY: Well drained, high runoff, moderate permeability in the upper part and slow permeability in the lower part.
USE AND VEGETATION: The major uses are wood products and some livestock grazing. The native plant community is subalpine fir and lodgepole pine with an understory of huckleberry, spirea, mountain arnica, and pine grass.
DISTRIBUTION AND EXTENT: Coldfeet soils are of small extent in southeastern Idaho and western Wyoming, MLRA 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Teton County, Idaho, 2011; proposed in Teton Area, Idaho, 2010.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 82 cm. (Oi, Oe, A1, A2 E1 and E2 horizons)
Argillic horizon: The zone from 82 to 152 cm. (Bt1 and Bt2 horizons)
Particle size control section: The zone from 82 to 132 cm. (Bt1 and Bt2 horizons)
ADDITIONAL DATA:
The typical pedon was not sampled.
National Cooperative Soil Survey
U.S.A.