LOCATION OXY WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Oxy silt loam- rangeland, on a 2 percent slope at an elevation of 2,550 feet. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures.)
A1--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam, black (10YR 2/1) moist; weak fine granular structure, soft, very friable, slightly sticky and nonplastic; many very fine and common fine roots; many fine tubular pores; 10 percent gravel; neutral (pH 6.8); clear smooth boundary.
A2--7 to 17 inches; dark grayish brown (10YR 4/2) gravelly silt loam, very dark brown (10YR 2/2) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common very fine and fine roots; few very fine and fine tubular pores; 25 percent gravel; neutral (pH 7.2); clear wavy boundary. (Combined thickness of the A horizon is 16 to 24 inches)
C--17 to 21 inches; grayish brown (10YR 5/2) gravelly silt loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; few very fine roots; few fine tubular pores; 25 percent gravel; slightly alkaline (pH 7.6); abrupt wavy boundary. (4 to 10 inches thick)
2R--21 inches; fractured basalt.
TYPE LOCATION: Klickitat County, Washington, about 500 feet north and 50 feet east of the southwest corner of section 13, T.5N., R.20E. (Latitude 45 degrees, 54 minutes, 44 secondsN. and Longitude 120 degrees, 15 minutes, 39 secondsW.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 50 to 52 degrees F. Solum thickness and depth to bedrock is 20 to 40 inches. These soils are usually moist, but are dry in the moisture control section for 90 to 105 consecutive days following summer solstice. Thickness of the mollic epipedon is 20 to 40 inches or to a lithic contact. The texture is dominantly silt loam but many pedons have thin lenses of sandy loam, very fine sandy loam or clay loam. The organic carbon content decreases irregularly with depth. The particle-size control section has 18 to 30 percent clay and 15 to 30 percent rock fragments.
The A horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 1 or 2 dry or moist. It has 0 to 10 percent gravel in the upper part and 15 to 25 percent gravel and 0 to 5 percent cobbles in the lower part.
The C horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry or moist. Texture of the fine-earth fraction is silt loam, sandy loam or clay loam. It has 15 to 25 percent gravel and 0 to 5 percent cobbles. Reaction is neutral or slightly alkaline.
COMPETING SERIES: These are the
Birdow,
Blackrock,
Coit,
Collister,
Dagor,
Draper,
Eastcan,
Goose Creek,
Goosenawt,
Gosinta,
Heidtman,
Lakeview,
Monroe,
Shoepeg,
Willowdale and
Winn series.
Birdow series - greater than 60 inches to bedrock
Blackrock series - greater than 60 inches to bedrock; 23 to 46 inches to secondary carbonates
Coit series - greater than 60 inches to bedrock; calcareous throughout
Collister series - greater than 60 inches to bedrock; 24 to 48 inches to redox concentrations
Dagor series - greater than 60 inches to bedrock; less than 15 percent rock fragments in the pscs
Draper series greater than 60 inches to bedrock; redox features at a depth of 30 to 60 inches; aquic conditions within 40 inches for greater than 90 days when not frozen
Eastcan series - greater than 60 inches to bedrock; 24 to 40 inches to redox concentrations; calcareous throughout
Goose Creek series - greater than 60 inches to bedrock; 24 to 40 inches to redox concentrations
Goosenawt series - greater than 60 inches to bedrock; 35 to 65 inches to secondary carbonates
Gosinta series - greater than 60 inches to bedrock; 24 to 60 inches to redox concentrations
Heidtman series - greater than 60 inches to bedrock; 10 to 30 inches to secondary carbonates
Lakeview series - greater than 60 inches to bedrock
Monroe series - greater than 60 inches to bedrock
Shoepeg series - 40 to greater than 60 inches to bedrock; 20 to 36 inches to redox concentrations
Willowdale series - greater than 60 inches to bedrock; 10 to 20 percent pumioce sand in pscs;
calcareous throughout
Winn series - greater than 60 inches to bedrock; redox concentrations below 16 inches;
calcareous throughout
GEOGRAPHIC SETTING: Oxy soils are on flood plains along narrow drainages on uplands. Elevations are 2,000 to 3,200 feet. These soils formed in alluvium derived from loess over basalt. The climate is characterized by warm and dry summers and cool and moist winters. The mean annual precipitation is 12 to 15 inches. The average January temperature is 26 degrees F. and the average July temperature is 68 degrees F. The mean annual temperature is 50 to 52 degrees F. The frost-free season is 130 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bakeoven, Mikkalo, Morrow, and Van Nostern soils. The Bakeoven soils are on plateaus and shoulders and are very shallow. Mikkalo soils are on plateaus and are coarse-silty. Morrow, and Van Nostern soils are on plateaus and both soils are fine-silty.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate permeability. Occansional flooding occurs in late winter and early spring.
USE AND VEGETATION: These soils are used mainly for livestock grazing and wildlife habitat. Native vegetation is mainly bluebunch wheatgrass, basin wildrye, sandberg bluegrass, Idaho fescue, willow, stiff sagebrush, and Douglas eriogonum.
DISTRIBUTION AND EXTENT: Klickitat County, Washington; MLRA 8. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klickitat County, Washington, 2003. Name is coined
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the soil surface to 21 inches
Lithic contact - the zone beginning at 21 inches
Particle-size control section - the zone from 10 to 21 inches (Part of the A2 and C horizons).