LOCATION ANTILON WAEstablished Series
TAXONOMIC CLASS: Pumiceous or ashy-pumiceous over loamy, glassy over mixed, superactive, mesic Vitritorrandic Argixerolls
TYPICAL PEDON: Antilon gravelly sandy loam, idle land, formerly cultivated. (Colors for dry soil unless otherwise stated.)
Ap--0 to 10 inches; grayish brown (10YR 5/2) gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium prismatic structure; soft, very friable, nonsticky, nonplastic; many fine roots; few fine tubular pores; approximately 20 percent gravel-size pumice; mildly alkaline (pH 7.6); gradual smooth boundary. (6 to 12 inches thick)
BA--10 to 19 inches; grayish brown (10YR 5/2) gravelly sandy loam, dark brown (10YR 3/3) moist; massive; soft, very friable, nonsticky, nonplastic; common fine roots; few fine tubular pores; approximately 40 percent gravel-size pumice; mildly alkaline (pH 7.8); gradual smooth boundary. (4 to 12 inches thick)
BC--19 to 30 inches; brown (10YR 5/3) gravelly sandy loam, dark
brown (10YR 3/3) moist; massive; soft, very friable, nonsticky, nonplastic; common fine roots; few fine tubular pores; approximately 48 percent gravel-size pumice; moderately alkaline (pH 8.0); abrupt smooth boundary. (6 to 14 inches thick)
2Btkb--30 to 60 inches; light gray (2.5Y 7/2) silty clay loam, light brownish gray (2.5Y 6/2) moist; uncrushed colors of olive gray (2.5Y 4/4) moist and light olive brown (2.5Y 5/4) moist; strong medium subangular blocky structure; very hard, very firm, sticky, plastic; few fine roots; thick continuous clay films; few micro tubular pores; lime coatings in pores; strongly alkaline (pH 8.6).
TYPE LOCATION: Chelan County, Washington; along farm road; 500 feet west of east 1/4 corner sec. 36, T.28N., R.21E.
RANGE IN CHARACTERISTICS: Estimated mean annual soil temperature at 20 inches depth is 50 degrees to 55 degrees F. These soils are usually dry in all parts between 8 and 24 inches. The upper part of the control section is dominated by volcanic pumice, 35 to 75 percent by volume, with lesser amounts of volcanic ash; and contains 60 to 90 percent pyroclastic materials. The lower part of the control section is silty clay loam modified by 10 to 35 percent nonpumice coarse fragments. The mollic epipedon is 8 to 18 inches thick. The soils are mildly alkaline to strongly alkaline. Depth to the lithologic discontinuity and secondary carbonate is 16 to 38 inches.
The A (or Ap) horizon has value of 4 or 5 dry and 2 or 3 moist, and chromas of 1 or 2 dry or moist. It has weak blocky, platy or prismatic structure.
The BA horizon has value of 4 through 6 dry and 3 or 4 moist, and chroma of 1 through 3 dry or moist. It is gravelly sandy loam or very gravelly sandy loam with pumice gravel. It is massive or has weak blocky or granular structure.
The BC horizon has hue of 10YR or 2.5Y, value of 5 through 7
dry, and 3 through 5 moist, and chroma of 2 or 3 dry or moist. It is gravelly sandy loam or very gravelly sandy loam with pumice gravel.
The 2Btkb horizon has hue of 2.5Y or 5Y, value of 5 through 7 dry, and chroma of 2 or 3 dry. It is silty clay loam or gravelly silty clay loam and has moderate to strong structure.
COMPETING SERIES: These are the Chelan and Supplee series in other families. Chelan soils have control sections dominated by pumice throughout. Supplee soils have sandy-skeletal material in the lower part of the particle-size control section.
GEOGRAPHIC SETTING: These soils are at elevations of 1,200 to 1,800 feet on terraces and terrace escarpments. These soils formed in pumice and ash mixed with some loess over lacustrine sediments. The climate is semiarid; summers are hot and dry an winters are cold and moist. Average annual precipitation is 10 to 13 inches. Mean January temperature is 25 degrees F., average July temperature is 72 degrees F. The mean annual temperature is about 49 degrees F, and average frost-free season is 185 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Margerum soils and the competing Chelan and Supplee soils. Margerum soils, have less than 60 percent pyroclastic materials, and are fine-loamy.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained and moderately well- drained; slow to medium runoff; moderate permeability above the 2Btkb horizon and moderately slow permeability in the 2Btkb horizon.
USE AND VEGETATION: Used for irrigated cropland, rangeland, and wildlife habitat. Under irrigation, orchards, hay, and are common crops. The vegetation is bluebunch wheatgrass, needleandthread, bitterbrush, and scattered sagebrush.
DISTRIBUTION AND EXTENT: North-central Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Chelan County, Washington, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon ae a mollic epipedon from the surface to 19 inches and a cambic horizon from 19 to 30 inches formed in volcanic ash and pumice. A buried argillic horizon is at a depth of 30 to 60 inches.