LOCATION SCHAWANA WAEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, nonacid, mesic Lithic Xeric Torriorthents
TYPICAL PEDON: Schawana cobbly loamy fine sand, rangeland. (Colors are for dry soil unless otherwise stated.)
C1--0 to 3 inches; brown (10YR 5/3) cobbly loamy fine sand, dark brown (10YR 3/3) moist; single grained; loose; many very fine roots; 15 percent cobbles, 20 percent pebbles; slightly alkaline (pH 7.8); clear wavy boundary. (1 to 4 inches thick)
C2--3 to 12 inches; brown (10YR 4/3) gravelly very fine sandy loam, dark brown (10YR 3/3) moist; massive; soft, very friable; many very fine and coarse roots; 25 percent pebbles; slightly alkaline (pH 7.8); abrupt wavy boundary. (4 to 17 inches thick)
2R--12 inches; basalt.
TYPE LOCATION: Grant County, Washington; 2,100 feet south and 2,400 feet east of northwest corner, sec. 13, T.15N., R.23E., WM.
RANGE IN CHARACTERISTICS: Depth to basalt ranges from 8 to 20 inches. The mean annual soil temperature is 54 to 56 degrees F. The soils have an aridic moisture regime but are dry for less than 3/4 of the time that the soil temperature is 41 degrees F, or higher; and are moist during the winter. The particle-size control section averages 10 to 35 percent rock fragments. It has less than 1 percent and contains 3 to 8 percent clay organic matter throughout.
The C1 horizon has value of 4 or 5 dry, 3 or 4 moist, and chroma of 2 or 3 dry or moist.
The C2 horizon has value of 4 or 5 dry, 3 or 4 moist, and chroma of 2 or 3 dry or moist. It is gravelly very fine sandy loam, gravelly loamy very fine sand, gravelly fine sandy loam, very fine sandy loam, or loamy very fine sand.
COMPETING SERIES: This is the Onepennee series. Onepennee soils are less than 50 percent sand in the particle-size control section and are slightly acid or neutral throughout.
GEOGRAPHIC SETTING: Schawana soils are on benches and hillsides at elevations of 500 to 2,300 feet. Slopes are 0 to 65 percent. The climate is arid or semiarid with precipitation ranging from 6 to 9 inches. The mean annual temperature is 50 to 54 degrees F, and the frost free season is 140 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Burbank, Ekrub, Koehler, Quincy, and Quinton soils. Burbank and Quincy soils are deep. Ekrub soils are underlain by a lime silica cemented hardpan. Koehler and Quinton soils are 20 to 40 inches deep to a lithic contact.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow to rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Used for rangeland. Vegetation is needleandthread, bluebunch wheatgrass, Sandberg bluegrass, eriogonum, biscuitroot, balsamroot, phlox, penstemon, and stiff sagebrush.
DISTRIBUTION AND EXTENT: Central Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grant County, Washington, 1979.
REMARKS: Diagnostic horizons and features recognized in this pedon are: an ochric epipedon from the surface to 12 inches and a lithic contact at 12 inches.