LOCATION BULL ID
Established Series
Rev. CBR/TDT
04/2011
BULL SERIES
The Bull series consists of deep, well drained soils formed in loess over residuum weathered from rhyolite. Bull soils are in swales on hills and have slopes of 0 to 30 percent. The mean annual precipitation is about 530 mm and the mean annual air temperature is about 3.9 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Pachic Argixerolls
TYPICAL PEDON: Bull silt loam in a swale on a hill with 7 percent slope at an elevation of 1,888 meters. (Colors are for dry soil unless otherwise noted.)
A1--0 to 15 cm; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; strong fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine and medium roots; many very fine irregular pores; 2 percent gravel; slightly alkaline (pH 7.5); clear wavy boundary.
A2--15 to 23 cm; brown (10YR 4/3) silt loam, very dark brown (10YR 2/2) moist; moderate very fine subangular blocky structure parting to strong fine granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine irregular and common very fine and fine tubular pores; 2 percent gravel; slightly alkaline (pH 7.4); gradual wavy boundary. (Combined thickness of A horizons is 23 to 50 cm)
BA--23 to 45 cm; brown (10YR 4/3) silt loam, very dark brown (7.5YR 2.5/2) moist; moderate fine subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common very fine and fine tubular and very fine irregular pores; 5 percent gravel; neutral (pH 7.3); clear wavy boundary. (0 to 25 cm thick)
Bt1--45 to 69 cm; brown (10YR 5/3) silt loam, very dark brown (7.5YR 2.5/2) moist; strong medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine roots; common very fine, fine, and medium tubular pores; few (10 percent) faint clay films; 5 percent gravel; neutral (pH 7.3); clear wavy boundary.
Bt2--69 to 85 cm; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 3/3) moist; strong medium subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine, fine, and medium tubular pores; few (10 percent) distinct clay films; 10 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (Combined thickness of Bt horizons is 40 to 69 cm)
2Bt3--85 to 96 cm; light yellowish brown (10YR 6/4) extremely channery sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; moderately hard, firm, moderately sticky and moderately plastic; few very fine roots; common very fine and fine tubular pores; many (70 percent) distinct clay films; 40 percent channers and 40 percent gravel; neutral (pH 6.6); abrupt wavy boundary.
2Bt4--96 to 133 cm; pale brown (10YR 6/3) extremely flaggy clay loam, dark yellowish brown (10YR 4/4) moist; strong medium subangular blocky structure; very hard, friable, moderately sticky and moderately plastic; many (70 percent) distinct clay films; 30 percent flagstones, 40 percent channers, and 20 percent gravel; neutral (pH 6.6); abrupt wavy boundary. (Combined thickness of 2Bt horizons is 40 to 50 cm)
2R--133 to 152 cm; rhyolite
TYPE LOCATION: Teton County, Idaho; about 3.8 km northeast of Tetonia; 334 meters west and 740 meter south of the northeast corner of section 16, T. 6 N., R. 45 E.; Tetonia USGS topographic quadrangle; lat. 43 degrees, 50 minutes, and 49.1 seconds N. and long. 111 degrees, 8 minutes, 39.3 seconds W., NAD83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness: 70 to 100 cm
Depth to lithologic discontinuity: 70 to 100 cm
Depth to bedrock: 100 to 152 cm
Particle size control section average rock fragments: 2 to 25 percent
Particle size control section average clay: 22 to 32 percent
Reaction: neutral to slightly alkaline
Soil moisture regime: xeric
Mean annual soil temperature: 5.0 to 8.0 degrees C. (frigid soil temperature regime)
Mean summer soil temperature: 15.0 to 18.3 degrees C.
A horizons
Hue: 7.5YR or 10YR moist or dry
Value: 2 or 3 moist, 3 or 4 dry
Chroma: 1 or 2 moist, 2 or 3 dry
Rock fragments: 0 to 5 percent gravel
AB or BA horizon
Hue: 7.5YR or 10YR moist
Value: 2.5 or 3 moist
Chroma: 2 or 3 moist
Rock fragments: 2 to 10 percent gravel
Bt horizon
Hue: 7.5YR or 10YR moist
Value: 2.5 or 3 moist, 4 or 5 dry
Chroma: 2 or 3 moist, 2 to 4 dry
Texture: SIL or CL with 2 to 10 percent total fragments; 2 to 10 percent gravel and 0 to 10 percent flagstones
2Bt horizon
Hue: 7.5YR or 10YR moist
Value: 3 or 4 moist, 4 or 6 dry
Chroma: 3 or 4 moist and dry
Fine-earth texture: SCL or CL with 65 to 90 percent total fragments; 10 to 45 percent gravel, 0 to 45 percent channers, 0 to 45 percent cobbles, and 0 to 45 percent flagstones
COMPETING SERIES: These are the
Carey Lake,
Dunford,
Hades,
Hurryback,
Krueger,
Lagnaf,
Mahogan,
Marotz,
Moffspring,
Nagle,
Needapepper,
Sag,
Strom and
Tusk series. Carey Lake, Hades, Hurryback, Krueger, Lagnaf, Marotz, Moffspring, Needapepper and Tusk soils are very deep. Dunford and Mahogan soils are moderately deep. Nagle soils have secondary carbonates in the particle size control section. Sag soils do not have flagstones within the particle size control section. Strom soils are somewhat poorly drained.
GEOGRAPHIC SETTING:
Landscape: plateaus
Landform: swales on hills
Elevation: 1,829 to 2,133 meters
Slope: 0 to 30 percent
Parent material: loess over residuum weathered from rhyolite
Mean annual air temperature: 3.3 to 5.6 degrees C.
Mean annual precipitation: 406 to 660 mm
Frost free period: 40 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Conneridge and
Milk (T) soils. Milk soils occur on convex positions and are moderately deep to bedrock. Conneridge soils occur on shoulder positions and have a calcic horizion.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well
Runoff: medium
Saturated hydraulic conductivity: moderately low
USE AND VEGETATION:
Major uses: dryland wheat, barley, hay, and range
Dominant native vegetation: mountain big sagebrush, Idaho fescue, and arrowleaf balsamroot
DISTRIBUTION AND EXTENT:
Distribution: Southeastern Idaho, MLRA 13
Extent: the series is not extensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Teton County, Idaho, 2011; Teton Area, Idaho and Wyoming Soil Survey
REMARKS:
Diagnostic horizons and soil characteristics recognized in this pedon are:
Mollic epipedon: from a depth of 0 to 85 cm
Argillic horizon: from a depth of 45 to 133 cm
Lithic bedrock: at a depth of 133 cm
Particle size control section: from a depth of 45 to 95 cm with weighted average rock fragments about 22 percent
Soil temperature regime: frigid
Soil moisture regime: xeric
ADDITIONAL DATA:
Typical pedon was not sampled.
National Cooperative Soil Survey
U.S.A.