LOCATION SCHOOLEY WAEstablished Series
TAXONOMIC CLASS: Loamy over ashy or ashy-pumiceous, aniso, isotic over glassy, nonacid, mesic Aquandic Fluvaquents
TYPICAL PEDON: Schooley silt loam, pasture. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 6 inches; very dark grayish brown (10YR 3/2) ashy silt loam crushed dark gray (10YR 4/1) broken, grayish brown (10YR 5/2) dry; common fine prominent reddish brown (5YR 4/4) redox concentrations; moderate very fine, fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; few coarse and medium and common very fine and fine roots; many very fine tubular pores; moderately acid (pH 6.0); clear smooth boundary. (2 to 7 inches thick)
Bw1--6 to 12 inches; dark brown (10YR 3/3) ashy silt loam crushed, grayish brown (10YR 5/2) broken, pale brown (10YR 6/3) dry crushed, light brownish redox features; moderate fine, medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; few medium and common very fine and fine roots; many very fine tubular pores; slightly acid (pH 6.2); clear wavy boundary. (3 to 10 inches thick)
Bw2--12 to 21 inches; brown (10YR 4/3) ashy silt loam crushed, grayish brown (10YR 5/2) broken, many fine prominent dark reddish brown (5YR 3/4) redox concentrations; weak medium and coarse and moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; few medium and common very fine and fine roots; many very fine tubular pores; 10 percent soft concretions; neutral (pH 6.6); abrupt wavy boundary. (5 to 14 inches thick)
2C1--21 to 31 inches; white (10YR 8/1) ashy sand (volcanic ash), very pale brown (10YR 8/3) dry; common fine prominent reddish yellow (7.5YR 6/8) redox concentrations; single grained; loose common very fine and fine roots; neutral (pH 6.8); abrupt smooth boundary. (4 to 24 inches thick)
3C2--31 to 40 inches; dark grayish brown (10YR 4/2) silt loam, crushed, gray (10YR 5/1) broken, light gray (10YR 7/2) dry crushed, light gray (10YR 7/1) dry broken, common fine prominent yellowish red (5YR 4/6) redox concentrations; weak medium and coarse subangular blocky structure; hard, friable, slightly sticky, slightly plastic; few very fine and fine roots; many very fine tubular pores; neutral (pH 6.6); gradual wavy boundary. (8 to 20 inches thick)
4c3--40 to 60 inches; very dark brown (10YR 2/2) very dark brown (10YR 2/2) sapric material, grayish brown (10YR 5/2) dry; massive; slightly hard, friable, nonsticky, nonplastic; slightly acid (pH 6.2).
TYPE LOCATION: Lewis County, Wahington; 3 miles east of Randle; 1,450 feet east and 900 feet south of SW corner of section 14, T.12N., R.7E.
RANGE IN CHARACTERISTICS: Depth to the ashy 2C horizon is 15 to 30 inches. The loamy 3C horizon is at a depth of 20 to 40 inches. The 4C horizon is at a depth of 40 to 60 inches. The mean annual soil temperature is 49 to 53 degrees F. These soils have a water table at 0 to 6 inches during the winter and early spring. Soil reaction ranges from moderately acid to neutral throughout.
The Ap horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 1 through 3 moist and dry.
The Bw horizon has value of 3 through 5 moist, 6 or 7 dry, and 2 through 4 moist and dry and is mottled. Texture is ashy silt loam or ashy loam. It is assumed to have a moist bulk density of 0.90 to 1.00 g/cm3. The acid oxalate aluminium plus one-half the acid oxalate iron is 1.0 to 1.5.
The 2C horizon has value of 5 to 8 moist, 6 to 8 dry and chroma of 1 through 8 moist and dry. It is ashy sand or ashy coarse sand.
The 3C horizon has value of 4 or 5 moist, 6 or 7 dry,and chroma of 1 or 2 moist and dry. It is silt loam or loam.
The 4C horizon is sapric or hemic material and ranges widely in color.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: The Schooley soils are shallow depressions on floodplains. Elevations range from 800 to 1,200 feet. The soils formed in alluvium from basic igneous rocks with a mantle of volcanic ash. The climate is mild marine with 50 to 70 inches annual precipitation occurring mostly as rain during the winter. The mean January temperature is 35 degrees F.; the mean July temperature is 64 degrees F.; and the mean annual temperature is 50 degrees F. The frost free season is 125 to 175 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cloquato, Newberg, Semiahmoo, and Siler soils. Cloquato and Newberg soils have a mollic epipedon. Cloquato soils are coarse, silty. Newberg soils are coarse-loamy. Semiahmoo soils are organic soils. Siler soils have an umbric epipedon and lack aquic moisture regime.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderate permeability in the solum, rapid in the ash layer, and moderately slow below. These soils are subject to frequent brief flooding. The water table is at 0 to 6 inches of the soil surface during the winter and early spring.
USE AND VEGETATION: Schooley soils are used mainly for permanent pasture and cropland. Forage crops are the principal crops. Native vegetation is red alder, western hemlock, and western red cedar with an understory of water loving plants such as spiraea, sedges, and water tolerate grasses.
DISTRIBUTION AND EXTENT: Western Washington, in eastern Lewis County. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lewis County, Washington, 1940.
REMARKS: Diagnostic horizons and other features:
The zone from 0 to 21 inches is assumed to meet Aquandic Subgroup criteria 1 and the zone from 21 to 31 inches is assumed to meet Aquandic Subgroup criteria 2. The zone from 10 to 21 inches is not ashy as it is assumed to have less than 30 percent glass (loamy). The zone from 21 to 31 inches is considered to be (ashy). The zone from 31 to 40 inches is assumed to be (loamhy). The zone from 10 to 40 inches is loamy over ashy over loamy and is called loamy over ashy, aniso. The soil has an ochric epipedon based on crushed dry color of 10YR 6/3 at 6 to 12 inches and a cambic horizon at 6 to 21 inches.