LOCATION TAMMING WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Pachic Ultic Argixerolls
TYPICAL PEDON: Tamming stony silt loam - open coniferous forest on a 40 percent south facing slope at an elevation of 3,150 feet. (Colors are for dry soil unless otherwise noted)
Oe--0 to 1 inch; loose, partly decayed needles, twigs, and branches. (1 to 2 inches thick)
A1--1 to 5 inches; dark grayish brown (10YR 4/2) stony silt loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; hard, friable, moderately sticky and moderately plastic; many very fine, fine and medium roots; many very fine irregular pores; 20 percent pebbles, 5 percent cobbles and 2 percent stones; neutral (pH 6.8); clear smooth boundary. (3 to 7 inches thick)
A2--5 to 12 inches; brown (10YR 5/3) very gravelly silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure and moderate fine subangular blocky; hard, friable, moderately sticky and moderately plastic; many very fine and fine roots, common medium and few coarse roots; many very fine irregular pores; 30 percent pebbles and 10 percent cobbles and stones; slightly acid (pH 6.4); clear wavy boundary. (3 to 9 inches thick)
Bt1--12 to 23 inches; brown (10YR 5/3) very gravelly silty clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; many very fine, common fine and medium and few coarse roots; common very fine irregular and few fine irregular pores; few faint stress cutans and clay films on ped faces; 35 percent pebbles and 5 percent cobbles; slightly acid (pH 6.4); clear wavy boundary. (8 to 13 inches thick)
2Bt2--23 to 37 inches; brown (10YR 5/3) very gravelly clay loam, dark brown (10YR 3/3) moist; moderate medium and fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium roots; common very fine irregular and tubular pores; common faint stress cutans and clay films on faces of peds; 40 percent pebbles and 10 percent cobbles; slightly acid (pH 6.2); clear wavy boundary. (8 to 15 inches thick)
2Bt3--37 to 45 inches; brown (10YR 5/3) extremely cobbly clay loam, dark brown (10YR 3/3) most, moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine, fine and few medium roots; common very fine irregular and few fine irregular pores; many faint stress cutans and clay films on surfaces of peds; 40 percent pebbles and 30 percent cobbles; slightly acid (pH 6.4); abrupt wavy boundary (7 to 16 inches thick)
3R--45 inches, basalt
TYPE LOCATION: Asotin County, Washington; about 7 miles west of Cloverland, 700 feet south and 1,100 feet west of northeast corner of sec. 15 T., 9 N., R. 43 E.
RANGE IN CHARACTERISTICS: The solum thickness and depth to basalt is 40 to 60 inches. The mean annual soil temperature ranges from 47 to 50 degrees F. The soils are usually moist, but are dry in all parts between depths of 4 to 12 inches for 60 to 75 consecutive days during summer and fall. The particle-size control section averages 35 to 60 percent angular basalt fragments. The mollic epipedon is 20 to 25 inches thick. The A horizon is 6 to 15 inches thick. Reaction is slightly acid or neutral.
The A horizon has value of 4 or 5 dry and chroma of 2 or 3 moist and dry. The A2 horizon is cobbly silt loam, very gravelly silt loam, or very cobbly silt loam.
The Bt1 horizon has a value of 4 or 5 dry and chroma of 2 or 3 moist. The fine earth fraction is silty clay loam, clay loam, or loam and is very gravelly, very cobbly, or cobbly.
The 2Bt2 & 2Bt3 horizons have hue of 7.5YR or 10YR, value of 4 or 5 dry, 3 or 4 moist, and chroma of 3 or 4 dry and moist. It is very gravelly, very cobbly, or extremely cobbly.
COMPETING SERIES: These are the Badgermont, Lawyer, and Oreoke series. Badgermont soils are moderately deep to a lithic contact. Lawyer and Oreoke soils are very deep.
GEOGRAPHIC SETTING: Tamming soils are on canyon walls and mountainsides and have slopes of 30 to 70 percent. These soils formed in loess, colluvium and slope alluvium from basalt and minor amounts of volcanic ash. Elevation ranges from 1,800 to 4,000 feet. These soils are in a climate with warm, dry summers and cool, moist winters. The average annual precipitation ranges from 20 to 25 inches. The mean January temperature is about 30 degrees F and the mean July temperature is about 66 degrees F. Mean annual air temperature is about 46 degrees F. The frost-free season is 100 to 125 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gwinly, Mallory, and Rockly soils. Gwinly, Mallory, and Rockly soils have basalt at depths less than 40 inches.
DRAINAGE AND PERMEABILITY: Well drained, medium to rapid runoff, moderately slow permeability.
USE AND VEGETATION: Used for grazable woodland and wildlife habitat. Native vegetation is ponderosa pine, with an understory mainly of bluebunch wheatgrass, Idaho fescue, and rose.
DISTRIBUTION AND EXTENT: Blue Mountains in southeastern Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Asotin County, Washington, 1984.
REMARKS: Diagnostic horizons and features recognized in this pedon are 1-inch thick organic layer, a mollic epipedon from the mineral surface to 23 inches, and an argillic horizon from 12 to 45 inches.