LOCATION TEVIS MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Dystric Eutrudepts
TYPICAL PEDON: Tevis gravelly loam, forested. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 2 inches; undecomposed and slightly decomposed forest litter. (1 to 2 inches thick)
A--2 to 5 inches; brown (10YR 5/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, medium, and coarse roots; many very fine and fine pores; 30 percent gravel; moderately acid (pH 6.0); abrupt wavy boundary. (0 to 8 inches thick)
E1--5 to 16 inches; very pale brown (10YR 7/3) very gravelly sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, medium, and coarse roots; many very fine and fine pores; 60 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (5 to 15 inches thick)
E2--16 to 24 inches; light gray (10YR 7/2) extremely gravelly sandy loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, medium, and coarse roots; many very fine and fine pores; 60 percent gravel, 5 percent cobbles; slightly acid (pH 6.2); clear wavy boundary. (6 to 15 inches thick)
E/Bw--24 to 60 inches; E part (80 percent) is very pale brown (10YR 7/3) extremely gravelly sandy loam, brown (10YR 5/3) moist which surrounds the B part; B part (20 percent) is pale brown (10YR 6/3) extremely gravelly loam, brown (10YR 4/3) moist; texture mixed is extremely gravelly sandy loam; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, medium, and coarse roots; many very fine and fine pores; 60 percent gravel, 10 percent cobbles; slightly acid (pH 6.2).
TYPE LOCATION: Missoula County, Montana; 500 feet north and 1,000 feet east of the SW corner of sec. 19, T. 12 N., R. 23 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 40 to 46 degrees F.
Moisture control section - between 8 and 24 inches.
A horizon
Hue: 10YR or 7.5YR
Value: 4, 5, or 6 dry; 3 or 4 moist
Chroma: 2 or 3
Clay content: 10 to 15 percent
Rock fragments: 15 to 60 percent--0 to 5 percent cobbles, 15 to 30 percent gravel
Reaction: pH 5.6 to 7.3
E1 horizon
Hue: 10YR or 7.5YR
Value: 6 or 7 dry; 4 or 5 moist
Chroma: 2 or 3
Texture: fine sandy loam, sandy loam, or loam
Clay content: 5 to 15 percent
Rock fragments: 30 to 60 percent--0 to 10 percent cobbles; 30 to 50 percent gravel
Reaction: pH 5.6 to 7.3
E2 horizon
Hue: 2.5Y, 10YR or 7.5YR
Value: 6 or 7 dry; 4 or 5 moist
Chroma: 1, 2 or 3
Texture: fine sandy loam, sandy loam, or loam
Clay content: 5 to 10 percent
Rock fragments: 50 to 80 percent--0 to 10 percent cobbles; 40 to 70 percent gravel
Reaction: pH 5.6 to 7.3
E/Bw horizon
Hue: E or Bw part 2,5Y, 10YR or 7.5YR
Value: E part 6 or 7, B part 5 or 6 dry; E part 5 or 6, B part 4 or 5 moist
Chroma: E part 1, 2 or 3; B part 2, 3, or 4
Texture: sandy loam, fine sandy loam, or loam
Clay content: 5 to 10 percent
Rock fragments: 60 to 85 percent--0 to 10 percent cobbles, 55 to 75 percent gravel
Reaction: pH 6.1 to 7.3
COMPETING SERIES:
Eveleth (MN) - has horizons of dense till between 25 and 40 inches.
GEOGRAPHIC SETTING:
Landform - mountains.
Elevation - 3,300 to 6,000 feet.
Slope - 0 to 80 percent.
Parent material - outwash or colluvium derived from argillite and quartzite.
Climate - long, cold winters; moist springs.
Mean annual precipitation - 23 to 40 inches.
Mean annual air temperature - 38 to 44 degrees F.
Frost-free period - 70 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; moderately rapid permeability.
USE AND VEGETATION: Tevis soils are used mainly for timber production, wildlife habitat, and for watersheds. Potential native vegetation is Douglas fir, ponderosa pine, western larch, and lodgepole pine with an understory of dwarf huckleberry, blue huckleberry, and common beargrass.
DISTRIBUTION AND EXTENT: Tevis soils are of small extent in western Montana. MLRA 43A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Missoula County, Montana, 1985.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 9 inches (Oi, A, E1 horizons);
Albic horizon - 5 to 24 inches (E1, E2 horizons);
Cambic horizon - 24 to 60 inches (E/Bw horizon); and
Particle-size control section - 10 to 40 inches (E1, E2, E/Bw horizons).
Tevis soils have a frigid temperature regime and a udic moisture regime.
ADDITIONAL DATA: Soil interpretation record MT0402.