LOCATION COXIT WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts
TYPICAL PEDON: Coxit gravelly ashy sandy loam - forestland, on a 30 percent east-facing slope at an elevation of 5,100 feet. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures)
Oe--0 to 1 inch; moderately decomposed organic matter consisting of needles, grasses and twigs.
A1--1 to 2 inch; light brownish gray (10YR 6/2) gravelly ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium, and common coarse roots; many fine and medium tubular pores; 15 percent pebbles and 5 percent cobbles; neutral (pH 6.8); clear smooth boundary.
A2--2 to 8 inches; brown (10YR 5/3) gravelly ashy sandy loam, dark brown (10YR 3/3) moist; weak fine and medium granular structure; soft, friable, nonsticky and nonplastic; many very fine, fine, and medium, and common coarse roots; common fine and medium tubular pores; 20 percent pebbles and 5 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary. (Combined A horizon is 4 to 9 inches thick)
Bw1--8 to 24 inches; brown (10YR 5/3) very cobbly ashy sandy loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; many fine and medium, and common coarse roots; common fine tubular pores; 25 percent pebbles, 20 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); gradual wavy boundary.
Bw2--24 to 35 inches; yellowish brown (10YR 5/6) very cobbly ashy sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many fine and medium, and common coarse roots; common fine tubular pores; 25 percent pebbles, 20 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); clear wavy boundary. (Combined Bw horizon is 10 to 32 inches thick)
2C1--35 to 49 inches; light yellowish brown (2.5Y 6/4) very cobbly sandy loam, olive brown (2.5Y 4/4) moist; massive; slightly hard, friable, slightly sticky and nonplastic; common fine and medium, and few coarse roots; few fine irregular pores; 20 percent pebbles, 20 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); gradual wavy boundary.
2C2--49 to 61 inches; light yellowish brown (2.5Y 6/4) very cobbly sandy loam, olive brown (2.5Y 4/4) moist; massive; hard, friable, slightly sticky and nonplastic; few fine, medium, and coarse roots; few fine irregular pores; 30 percent pebbles, 25 percent cobbles, and 5 percent stones; moderately acid (pH 5.8).
TYPE LOCATION: Okanogan County, Washington; about 0.75 miles east of Muckamuck Mountain and 5.5 miles northwest of the town of Conconully on the Conconully West USGS topographic quadrangle. (Latitude 48 degrees 36' 34" N. and Longitude 119 degrees 50' 15" W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 42 to 45 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 60 to 75 days following the summer solstice. Thickness of the solum and volcanic ash influence is 14 to 35 inches, and has an estimated moist bulk density of 1.10 to 1.40 g/cc, volcanic glass content of 5 to 20 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 1.0 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 35 to 60 percent rock fragments and 8 to 18 percent clay.
The A horizon has value of 5 or 6 dry, and chroma of 2 or 3 dry or moist.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 to 6 dry or moist. It is very gravelly sandy loam or very cobbly sandy loam. It averages 20 to 30 percent pebbles, 5 to 20 percent cobbles, and 0 to 5 percent stones. Reaction is moderately acid to neutral.
The 2C horizon has hue of 10YR or 2.5Y. It is very gravelly ashy sandy loam or very cobbly ashy sandy loam. It averages 35 to 60 percent rock fragments, with 20 to 40 percent pebbles, 5 to 25 percent cobbles, and 0 to 5 percent stones. Reaction is moderately acid to neutral.
COMPETING SERIES: These are the Analulu, Blinn, Brevco, Easte, Highhorn, Huntrock, Jimbluff, Jumpe, Kamela, Lekrem, Longort, Noil, Ontrail, Radarcreek, Redpeak, Santop, Seeburt, and Thout series. Ardenvoir, Easte, and Noil soils are deep to a paralithic contact. Jumpe soils have loam and silt loam fine-earth textures throughout the profile. Seeburg soils have a mixed ash mantle 7 to 14 inches thick and have 4 to 7 percent clay in the particle-size control section. Analulu, Blinn, Kamela, Brevco, Redpeak, Santop, and Thout soils are moderately deep to a lithic contact. Highhorn and Radarcreek soils are deep to a lithic contact. Huntrock soils have 27 to 35 percent clay and 60 to 80 percent rock fragments in the particle-size control section. Jimbluff soils have 60 to 80 percent rock fragments in the particle-size control section. Lekrem soils have 3 to 8 percent clay. Longort soils have a Cd horizon. Ontrail soils have hue of 5YR or 7.5YR.
GEOGRAPHIC SETTING: The Coxit soils are on backslopes of mountains at elevations of 4,200 to 5,300 feet. Slopes are 15 to 65 percent. These soils formed in colluvium and residuum from metasedimentary rock with minor amounts of glacial till and a component of volcanic ash in the upper part. The climate is characterized by warm, dry summers and cool, moist winters. The average annual precipitation ranges from 20 to 24 inches. The average January temperature ranges from 22 to 26 degrees F.; the average July temperature ranges from 62 to 67 degrees F.; and the average annual air temperature ranges from 40 to 44 degrees F. The frost-free season is 90 to 115 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Finney, Nahahum, and Pelican soils. Finney soils are on upper backslopes and shoulders of mountains and are andic and cryic. Nahahum soils are on backslopes of mountains and are fine-loamy. Pelican soils are on backslopes of mountains and have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained, medium to very rapid runoff; moderately rapid permeability.
USE AND VEGETATION: This soil is used for timber production, wildlife habitat, recreation, watershed, and livestock grazing. Native vegetation is western larch, Douglas-fir, and lodgepole pine with an understory of pinegrass, silky lupine, western yarrow, and heartleaf arnica.
DISTRIBUTION AND EXTENT: Northcentral Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Okanogan National Forest, Okanogan County, Washington, 2005.
REMARKS: Diagnostic horizons and features in this pedon include:
Ochric epipedon
Cambic horizon - 8 to 35 inches (Bw1 and Bw2 horizons)
PSCS - zone from 11 to 41 inches (part of Bw1, Bw2, and 2C1 horizons). Vitrandic properties from 1 to 35 inches.
ADDITIONAL DATA: NSSL S94WA-047-006.