LOCATION WOLFESON WAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Aquic Haploxerepts
TYPICAL PEDON: Wolfeson very fine sandy loam, cropland. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; light brownish gray (10YR 6/2) very fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure parting to medium granular; soft, very friable, slightly sticky and nonplastic; many very fine and fine roots; many very fine pores; organic matter is discrete particles and aggregates; slightly acid (pH 6.4); abrupt smooth boundary. (4 to 8 inches thick)
B21--7 to 17 inches; light gray (10YR 7/2) fine sandy loam, brown (10YR 5/3) moist; common medium distinct dark brown (7.5YR 3/4) mottles; massive; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; many very fine pores; few very thin clay films in pores; organic matter in discrete particles and aggregates; slightly acid (pH 6.4); clear wavy boundary. (6 to 12 inches thick)
B22--17 to 35 inches; light gray (10YR 7/2) fine sandy loam, brown (10YR 5/3) moist; many fine and medium distinct brown (7.5YR 4/4) mottles; massive; very hard, firm, nonsticky and nonplastic; few very fine and fine roots; few fine pores; 2 discontinuous, brown (7.5YR 4/4) wavy bands 1/8 inch thick with thin clay films in a few pores; soil firmer adjacent to bands; neutral (pH 6.6); clear wavy boundary. (10 to 28 inches thick)
IIB23--35 to 44 inches; light gray (2.5Y 7/2) clay loam, grayish brown (10YR 5/2) moist; many medium and common large brown (7.5YR 4/4) mottles; moderate medium prismatic structure parting to moderate medium subangular blocky; very hard, firm, sticky and plastic; few very fine and fine roots; many very fine pores; few thin and moderately thick clay films on faces of prisms, in tubular pores, and adjacent areas; few black stains; neutral (pH 6.6); clear wavy boundary. (0 to 12 inches thick)
IIIC1--44 to 51 inches; light yellowish brown (2.5Y 6/4) loamy fine sand, olive brown (2.5Y 4/4) moist; many fine brown (7.5YR 4/4) and few fine faint dark grayish brown (10YR 4/2) mottles moist; massive; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; many fine pores; neutral (pH 6.8); clear smooth boundary. (0 to 10 inches thick)
IVC2--51 to 60 inches; very pale brown (10YR 7/3) silty clay loam, brown (10YR 5/3) moist; many large distinct brown (7.5YR 4/4) and few fine faint dark grayish brown (10YR 4/2) mottles moist; moderate medium prismatic structure parting to moderate fine subangular blocky; very hard, firm, sticky and plastic; few very fine and fine roots; many very fine, few medium pores; common thin and moderately thick clay films in tubular pores; few clay bridges between mineral grains; some gray clean silt coatings; ped surfaces and few pores coated with clean mineral grains; neutral (pH 6.6).
TYPE LOCATION: Spokane County, Washington; 450 feet south and 1,000 feet west of junction of Spotted and Montogomery Road in the NW1/4 NE1/4 section 29, T.29N., R.42E., WM.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at 20 inches ranges from 47 to 49 degrees F. The moisture control section is dry in all parts for 45 consecutive days following the summer solstice. The soil is neutral or slightly acid. The A horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 2 or 3.
The B22 horizon has value of 5 through 7 dry, 3 through 5 moist, and chroma of 2 through 4. It is very fine sandy loam, sandy loam, fine sandy loam, or loam. This horizon has few to many fine or medium mottles. The dark brown wavy bands range from 1/8 to 3 inches in thickness. The IIB23 horizon is clay loam or silty clay loam.
The C horizon has hue of 10YR or 2.5Y, value of 5 through 7 dry, 4 or 5 moist, and chroma of 2 through 5. It is fine sandy loam, sandy loam, loamy fine sand, clay loam or silty clay loam. This horizon has few to many fine or medium mottles.
COMPETING SERIES: This is the Roche series and the closely related Chamokane and Wethey soils. Rosche soils have a desic contact with dense glacial till at 20 to 40 inches. Chamokane soils have a mollic epipedon and an irregular decrease in organic matter. Wethey soils are sandy and have an irregular decrease in organic matter.
GEOGRAPHIC SETTING: Wolfeson soils are on glacial lake terraces at elevations of 1,700 to 2,5000 feet. Slopes are 0 to 5 percent. The mean annual precipitation is 20 to 24 inches; the mean annual temperature is 46 degrees F.; and the mean annual temperature is about 46 degrees F. The frost free season is 100 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clayton, Hagen, Laketon, and the competing Wethey soils. Clayton soils are well drained. Hagen soils are sandy and somewhat excessively drained. Laketon soils are fine, silty and well drained.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderately slow permeability
USE AND VEGETATION: Principal use includes production of timber, grazed woodland, small grains and grass. Native vegetation is Douglas fir, western larch, ponderosa pine, grand fir, white pine, aspen, Oregon grape, strawberry, pachistima and grasses.
DISTRIBUTION AND EXTENT: Northeastern Washington. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Spokane County, Washington, 1971.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 7 inches. (Ap horizon)
Cambic horizon - The zone from 7 to 44 inches. (B21, B22, and B23 horizons)
Particle size control section - The zone from 10 to 40 inches. (a part of the B21, B22, and a part of the B23 horizons)