LOCATION WOODHURST MT+UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Woodhurst stony loam - native grass. (Colors are for dry soil unless otherwise noted.)
A--0 to 12 inches; very dark grayish brown (10YR 3/2) stony loam, very dark brown (10YR 2/2) moist; weak fine crumb structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots and fine interstitial pores; 20 percent stones; noncalcareous; slightly alkaline (pH 7.6); clear boundary. (8 to 15 inches thick)
Bt1--12 to 20 inches; dark grayish brown (10YR 4/2) very stony clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine blocky structure that parts to very fine granular with weathered igneous rock fragments that crush easily in the hand; soft, friable, moderately sticky and moderately plastic; many very fine roots and fine tubular pores; continuous distinct clay films on vertical faces and patchy clay films on horizontal faces with organically stained glossy film on weathered rock fragments; 50 percent rock fragments; slightly alkaline (pH 7.8); clear boundary. (5 to 15 inches thick)
Bt2--20 to 26 inches; brown (10YR 4/3) extremely stony clay loam, dark brown (10YR 3/3) moist; moderate medium and fine blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; distinct continuous clay films on all faces of peds; moderately alkaline (pH 8.3); noncalcareous; 80 percent rock fragments; clear wavy boundary. (2 to 10 inches thick)
R--26 inches; light colored hard quartz monzonite porphyry rock in situ. Weathered rock has organic stainings which give rise to a darker colored appearance.
TYPE LOCATION: Judith Basin County, Montana; Little Belt Mountains; 1,500 feet north and 450 feet east of center of sec. 26, T.14N., R.11E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 44 to 47 degrees F.
Average summer soil temperature - 55 to 59 degrees F.
Depth to bedrock - 20 to 40 inches.
A horizon - Hue: 2.5Y to 7.5YR
Value: 3 or 4 dry
Chroma: 1 or 2
Clay content: 20 to 27 percent
Rock fragments: 15 to 60 percent; 10 to 35 percent stones, 0 to 25 percent pebbles
Reaction: pH 6.6 to 7.8
Bt1 horizon - Hue: 2.5Y to 7.5YR
Value: 4 or 5 dry
Chroma: 2 or 3
Clay content: 27 to 35 percent
Rock fragments: 45 to 85 percent; 25 to 55 percent stones or cobbles, 20 to 30 percent pebbles
Reaction: pH 6.6 to 8.4
Bt2 horizon - Hue: 2.5Y to 7.5YR
Value: 3 or 4 dry
Chroma: 2 to 4
Clay content: 27 to 35 percent
Rock fragments: 50 to 85 percent; 30 to 55 percent stones or cobbles, 20 to 30 percent pebbles
Reaction: pH 7.4 to 8.4
COMPETING SERIES:
Badwater (WY) - is very deep.
Bickmore (UT) - has a calcic horizon.
Buena Vista (CO) - has horizons of secondary carbonate accumulation.
Dab (NV) - is very deep.
Delhew (NV) - is very deep.
Geemore (ID) - is very deep.
Parkay (UT) - is very deep
Redbird (SD) - is very deep.
GEOGRAPHIC SETTING:
Landform - mountains
Elevation - 5,000 to 9,000 feet.
Slope - 8 to 40 percent.
Parent material - residuum from nonacid igneous rocks.
Mean annual precipitation - 20 to 24 inches.
Mean annual temperature - 36 to 45 degrees F.
Mean summer temperature - 54 to 60 degrees F.
Frost-free period - 30 to 60 days.
DRAINAGE AND PERMEABILITY: Well-drained; moderate permeability.
USE AND VEGETATION: Used as rangeland. Vegetation is bluebunch wheatgrass, Idaho fescue, rough rescue, needle-and-thread grass, sedges, balsamroot, fringed sagewort, lupine and silver sagebrush.
DISTRIBUTION AND EXTENT: Mountain slopes of central and southwestern Montana and central Utah. Woodhurst soils are moderately extensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Judith Basin County, Montana, 1963.
REMARKS: Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the surface to 26 inches (A, Bt1 and Bt2 horizons); argillic horizon which is the particle-size control section from 12 to 26 inches (Bt1 and Bt2 horizons); a lithic contact at 26 inches (R horizon). Wood hurst soils have a cryic temperature regime and an ustic moisture regime.