LOCATION ROSLYN WAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, isotic, frigid Andic Dystroxerepts
TYPICAL PEDON: Roslyn sandy loam, under a coniferous forest on a 2 percent slope at an elevation of 2,260 feet. The soil was dry when described. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures)
O--1 to 0 inches; partially decomposed forest litter; abrupt smooth boundary. (1 to 2 inches thick)
A1--0 to 7 inches; dark yellowish brown (10YR 4/4) sandy loam, dark yellowish brown (10YR 3/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common fine and medium roots; common very fine irregular pores; 5 percent pebbles; NaF pH 10.5; slightly acid (pH 6.4); abrupt wavy boundary. (3 to 7 inches thick)
A2--7 to 14 inches; dark brown (7.5YR 4/4) sandy loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common fine roots; common very fine irregular pores; 5 percent pebbles; NaF pH 9.8; slightly acid (pH 6.4); gradual smooth boundary. (6 to 8 inches thick)
2Bw1--14 to 27 inches; strong brown (7.5YR 5/6) loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine roots; common very fine tubular pores; 5 percent pebbles; NaF pH 9.6; slightly acid (pH 6.2); abrupt smooth boundary. (10 to 15 inches thick)
2Bw2--27 to 36 inches; strong brown (7.5YR 5/6) loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few fine tubular pores; 10 percent pebbles; NaF pH 9.6 moderately acid (pH 5.8); abrupt wavy boundary. (8 to 13 inches thick)
2C--36 to 60 inches; yellowish brown (10YR 5/6) gravelly loam, dark yellowish brown (10YR 3/4) moist; weak coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few fine tubular pores; 15 percent pebbles; NaF pH 9.4 moderately acid (pH 5.8).
TYPE LOCATION: Kittitas County, Washington; about 4 miles west of Cle Elum; 250 feet east and 1,050 feet south of the northwest corner of sec. 31, T. 20 N., R. 15 E.
RANGE IN CHARACTERISTICS: Thickness of the solum ranges from 30 to 40 inches. The mean annual soil temperature ranges from 45 to 46 degrees F. The soils are usually moist but are dry in all parts in the moisture control section for 60 to 75 consecutive days during summer and fall. The upper 9 to 14 inches of the soils is more than 60 percent volcanic ash in the fine earth fraction. The particle-size control section averages 10 to 15 percent clay and 40 to 55 percent sand and is 5 to 30 percent rounded and subrounded pebbles by volume.
The A1 horizon has a value of 4 or 5 dry, and chroma of 3 or 4 dry, 2 through 4 moist.
The A2 horizon has a hue of 7.5YR or 10YR, value of 4 or 5 dry, 3 or 4 moist.
The 2Bw horizon has a hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 or 4 moist, and chroma of 4 or 6 dry. It is a loam, gravelly loam, or gravelly sandy loam.
The 2C horizon has a hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 or 4 moist, and chroma of 4 or 6 dry. It is a gravelly loam, gravelly sandy loam, or loam.
COMPETING SERIES: These are the Aits, Leadpoint, Moonville, Moscow, Moso, Ojibway, Volperie and Waits soils. Aits soils have a solum 10 to 14 inches thick and are slightly acid or neutral. Leadpoint, Moscow, Ojibway, and Volperie soils have a paralithic contact at a depth of 20 to 40 inches. Moonville and Waits soils are calcareous in the lower part of the control section. Moso soils are 5 to 35 percent fine angular granitic pebbles in the particle-size control section.
GEOGRAPHIC SETTING: Roslyn soils are on alluvial terraces and have slopes of 0 to 25 percent. The soils formed in glacial drift and old alluvium with a mantle of loess and volcanic ash. Elevation is 1,900 to 2,400 feet. These soils are in a climate with warm, dry summers and cool, moist winters. The average annual precipitation is 30 to 40 inches. The mean January temperature is about 26 degrees F, and the mean July temperature is about 65 degrees F. The average annual temperature is 44 degrees F. The growing season at 28 degrees F is 135 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bograp, Kladnick, Natkim, Racker, Roxer, and Teanaway series. Bograp, Natkim, and Roxer soils are on mountainsides. Bograp soils have a fine-loamy argillic horizon. Natkim and Roxer soils are medial-skeletal. Kladnick and Racker soils formed in outwash and are sandy-skeletal. Teanaway soils are fine-loamy and have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow to medium. Permeability is moderate.
USE AND VEGETATION: Woodland, wildlife habitat and watershed. Vegetation is Douglas-fir, grand fir, ponderosa pine, and western larch with an understory of vine maple, Oregon-grape, creambush oceanspray and elk sedge.
DISTRIBUTION AND EXTENT: Western Kittitas County, Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Kittitas County, Washington, 1936.
REMARKS: Diagnostic horizons and features recognized in this pedon are an ochric epipedon from the mineral surface to 14 inches that is more than 60 percent volcanic ash, and a cambic horizon from 14 to 36 inches that contains little volcanic ash.