LOCATION PASTIK WAEstablished Series
TAXONOMIC CLASS: Ashy over loamy, amorphic over isotic, mesic Aquic Vitrixerands
TYPICAL PEDON: Pastik silt loam, pasture. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
Ap--0 to 6 inches; dark brown (7.5YR 3/2) silt loam, brown (7.5YR 5/2) dry; weak fine granular structure; soft, very friable, slightly sticky, slightly plastic, weakly smeary; many fine and very fine roots; common fine and very fine interstitial pores; slightly acid (pH 6.2); abrupt smooth boundary. (0 to 7 inches thick)
Bs1--6 to 14 inches; dark brown (7.5YR 4/4) silt loam, brown (7.5YR 5/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; common fine and medium roots; few fine tubular pores; moderately acid (pH 6.0); clear wavy boundary. (6 to 8 inches thick)
Bs2--14 to 20 inches; yellowish brown (10YR 5/4) silt loam, light yellowish brown (10YR 6/4) dry; few medium distinct dark brown (7.5YR 4/4) mottles, light brown (7.5YR 6/4) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; common fine and medium roots; few very fine and common fine tubular pores; moderately acid (pH 6.0); clear wavy boundary. (6 to 14 inches thick)
Bs3--20 to 29 inches; yellowish brown (10YR 5/4) silt loam, light yellowish brown (10YR 6/4) dry; few medium distinct dark brown (7.5YR 4/4) and few medium distinct reddish yellow (7.5YR 6/6) mottles, light brown (7.5YR 6/4) and reddish yellow (7.5YR 8/6) dry; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic and weakly smeary; few fine roots; few fine tubular pores; moderately acid (pH 6.0); abrupt smooth boundary. (0 to 13 inches thick)
2C--29 to 60 inches; light olive gray (5Y 6/2) silt loam, light gray (5Y 7/2) dry; few fine distinct yellowish brown (10YR 5/6) and strong brown (7.5YR 5/6) mottles, brownish yellow (10YR 6/6) and reddish yellow (7.5YR 6/6) dry; massive; slightly hard, friable, slightly sticky, slightly plastic; few fine tubular pores; moderately acid (pH 6.0).
TYPE LOCATION: Snohomish County, Washington; 1,500 feet north and 1,200 feet east of the SW corner of section 31, T.28N., R.8E.
RANGE IN CHARACTERISTICS: The solum is 20 to 40 inches thick. Depth to mottles with chroma of 2 or less is more than 30 inches. The mean annual soil temperature at a depth of 20 inches is 47 to 51 degrees F. The 10 to 40 inch control section has 0 to 5 percent rock fragments and 18 to 30 percent clay. Reaction is strongly acid to slightly acid throughout.
The A horizon has hue of 10YR or 7.5YR, value of 3 through 5 moist, 5 through 7 dry, and chroma of 2 or 3 moist or dry. Structure is weak fine granular or weak subangular blocky. Some pedons have an E horizon.
The Bs1 horizon has hue of 10YR or 7.5YR, value of 4 through 6 moist, 5 through 7 dry, and chroma of 3 or 4 moist or dry. It is silt loam or loam. Structure is moderate fine or medium subangular blocky.
The Bs2 and Bs3 horizons have hue of 10YR or 7.5YR, value of 5 or 6 moist, 6 or 7 dry, and chroma of 3 through 5 moist or dry. They are the loam or silt loam. Structure is moderate medium subangular blocky or prismatic.
The C horizon has hue of 5Y or 2.5Y, value of 4 through 6 moist, 5 through 7 dry, and chroma of 2 through 4 moist or dry. Below 40 inches, it is silt loam or silty clay loam.
COMPETING SERIES: This is the similar Kitsap series. Kitsap soils have a cambic horizon.
GEOGRAPHIC SETTING: Pastik soils are on benches and terraces at elevations of 200 to 800 feet. Slope is 0 to 70 percent. These soils formed in lacustrine sediments and volcanic ash. The climate is characterized by mild, wet winters and cool, dry summers. The annual precipitation ranges from 45 to 70 inches. The average January temperature is 33 degrees F.; the average July temperature is 59 degrees F.; and the mean annual temperature is 46 degrees F. The frost free season is 140 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alderwood, Barneston, Cathcart, Nargar, Ogarty, Tokul, and Winston soils. Alderwood and Nargar soils have more than 35 percent rock fragments in the 10 to 40 inch control section. Alderwood and Tokul soils have dense glacial till at depths of 20 to 40 inches. Barneston soils are sandy-skeletal. Cathcart soils are coarse-loamy. Nargar soils are sandy. Ogarty soils are underlain by bedrock at a depth of 20 to 40 inches. Winston soils are coarse-loamy over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow to medium runoff; slow permeability. A perched water table reaches a maximum height of 1.5 to 2.5 feet for periods during the period of December through May.
USE AND VEGETATION: Used for woodland and pasture. Native vegetation is Douglas-fir, western hemlock, western redcedar, red alder, bigleaf maple, with an understory of willow, western brackenfern, western swordfern, ladyfern, red huckleberry, deer fern, and vine maple.
DISTRIBUTION AND EXTENT: Snohomish County, Washington, 1979.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
REMARKS: Classification only updated 3/94 because of recent amendments to Soil Taxonomy. Lab data number S77WA-61-31, Lincoln, Nebraska National Soil Survey Laboratory. Diagnostic horizons and features recognized in the pedon are an ochric epipedon from the mineral surface to 6 inches and a cambic horizon from 6 to 29 inches with mottles occurring below 14 inches.