LOCATION TEAKEAN IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Vitrandic Palexeralfs
TYPICAL PEDON: Teakean ashy silt loam, forested. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; needles, leaves and twigs. (0 to 1 inch thick)
A1--1 to 8 inches; light brown (7.5YR 6/4) ashy silt loam, brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and medium, common coarse roots; many very fine and fine irregular and few fine tubular pores; 10 percent gravel; moderately acid (pH 6.0); clear wavy boundary.
A2--8 to 13 inches; light brown (7.5YR 6/4) ashy silt loam, brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and medium, common coarse roots; many very fine, fine and medium irregular and few fine tubular pores; 10 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (A horizons 9 to 14 inches thick)
Bt1--13 to 19 inches; light brown (7.5YR 6/4) silt loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, firm, moderately sticky and slightly plastic; common fine, medium and coarse roots; common very fine and fine irregular and few fine tubular pores; 10 percent gravel; few faint clay films on faces of peds; moderately acid (pH 5.8); clear smooth boundary.
Bt2--19 to 23 inches; reddish yellow (7.5YR 6/6) silty clay loam, dark reddish brown (5YR 3/4) moist; moderate fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and medium roots; common very fine and fine irregular pores; 10 percent gravel; common faint clay films on faces of peds; few very pale brown (10YR 7/3) silt coatings on faces of peds; moderately acid (pH 5.8); gradual wavy boundary. (Bt horizons 0 to 34 inches)
B/E--23 to 42 inches; reddish yellow (5YR 6/6) gravelly clay loam, dark reddish brown (5YR 3/4) moist; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine roots; common very fine, fine and medium irregular pores; 15 percent gravel; common, distinct, clay films on faces of peds; many very pale brown (10YR 7/3) silt coatings on faces peds; moderately acid (pH 5.8); gradual wavy boundary. (0 to 23 inches thick)
Btx1--42 to 50 inches; yellowish red (5YR 5/6) gravelly clay loam, yellowish red (5YR 4/6) moist; weak fine prismatic structure parting to moderate fine subangular blocky ; hard, firm and brittle, very sticky and very plastic; common fine roots flattened and matted on faces of peds; common very fine and fine irregular pores; common very pale brown (10YR 7/3) silt coatings on faces of peds; 20 percent gravel; moderately acid (pH 5.6); clear wavy boundary. (5 to 10 inches thick)
Btx2--50 to 61 inches; yellowish red (5YR 5/6) gravelly clay loam, yellowish red (5YR 4/6) moist; weak medium prismatic structure; very hard, very firm and brittle, very sticky and very plastic; common fine roots flattened and matted on faces of peds; common very fine and fine irregular pores; 20 percent gravel; many, prominent, clay films on faces of peds and lining pores; iron stains on faces of peds; moderately acid (pH 5.8).
TYPE LOCATION: Clearwater County, Idaho; about 4 miles east of Southwick, Idaho; about 1,000 feet south and 1,700 feet east of the northwest corner of sec. 25, T. 38 N., R. 1 W.; Latitude - 46 degrees, 36 minutes, 43 seconds North; Longitude - 116 degrees, 24 minutes, 22 seconds West. USGS Southwick quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 41 to 46 degrees F (Frigid temperature regime)
Soil moisture - dry between depths of 4 to 12 inches for 45 to 70 days following the summer solstice. (Xeric moisture regime)
Base saturation - 50 to 80 percent in the argillic (below 60 percent in some part)
Depth to fragipan - 40 to 60 inches
A horizons
Hue - 10YR or 7.5YR dry, 5YR or 7.5YR moist
Value - 5 or 6 dry, 2.5 to 4 moist
Chroma - 3 to 5 dry, 2 to 4 moist
Texture - Ashy-L, Ashy-SIL
Clay content - 17 to 26 percent
Rock fragments - 0 to 10 percent gravel
Reaction - strongly acid to neutral
Bt horizons:
Hue - 10YR to 5YR dry, 5YR or 7.5YR moist
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 4 to 6 dry, 3 to 6 moist
Textures - SIL, SICL, CL, GR-CL, GR-SICL, L, GR-L, GR-SIL
Clay content - 22 to 35 percent
Rock fragments - 0 to 30 percent gravel
Reaction - very strongly acid to slightly acid
B/E horizons (where present includes E and E/B horizons)
B part
Hue - 5YR to 10YR dry, 2.5YR to 7.5YR moist
Valuse - 5 or 6 dry, 3 to 5 moist
Chroma - 4 to 6 dry or moist
Texture - C, CL, GR-CL
Clay content - 38 to 42 percent
Rock fragments - 0 to 15 percent gravel
E part
Hue - 7.5YR or 10YR dry, 5YR to 10YR moist
Value - 6 or 7 dry, 3 to 6 moist
Chroma - 1 to 4 dry, 2 to 6 moist
Texture - GR-CL, CL, SIL
Clay content - 22 to 38 percent
Rock fragmets - 0 to 15 percent gravel
Reaction - very strongly acid to moderately acid
Btx horizons:
Hue - 10YR to 5YR dry, 5YR or 7.5YR moist
Value - 5 or 6 dry, 4 to 6 moist
Chroma - 4 to 6 dry, 3 to 8 moist
Textures - CL, GR-CL, GR-SICL, SICL, GR-L, GRV-CL
Clay content - 26 to 39 percent
Rock fragments - 10 to 50 percent gravel
Reaction - very strongly acid to slightly acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Teakean soils are on mountain slopes and ridges at elevations of 1,600 to 4,300 feet. The slope range is 10 to 50 percent. These soils formed in loess and material weathered from gneiss and schist rock. The average annual temperature is 40 to 45 degrees F. The average annual precipitation is about 25 to 40 inches and the frost-free season is about 80 to 125 days (9 in 10 years to 1 in 10 years, respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Crumarine, Dworshak, Kauder, Kruse, and Hugus series. Crumarine soils are somewhat poorly drained and are in drainageways. Kauder soils have a volcanic ash mantle and a fragipan and are on hills. Dworshak and Hugus soils have a volcanic ash mantle, a udic moisture regime and are on mountain sideslopes.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is rapid or very rapid. Permeability is moderately slow to 42 inches and very slow below this depth. Typically, a perched water table occurs at a depth of 22 to 28 inches from December through April, but can occur at a depth of 22 to 40 inches from November to mid-May.
USE AND VEGETATION: This soil is used primarily for timber production, livestock grazing, wildlife habitat and watershed. Some areas have been cleared for cultivation. The natural vegetation is mainly grand fir, Douglas-fir, creambush oceanspray, mallow ninebark, common snowberry,
heartleaf arnica and elk sedge.
DISTRIBUTION AND EXTENT: North-central, Idaho. Teakean soils are not extensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clearwater County, Idaho, 2003.
REMARKS:
Diagnostic horizons and other features recognized in this pedon:
Ochric epipedon - the zone from 1 to 13 inches (A horizons).
Particle-size control section - the zone from 13 to 23 inches (Bt1 and Bt2 horizons).
Fragipan at 42 inches extending to at least 61 inches (Btx horizons).