LOCATION VANGOE WATentative Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Vitrandic Argixerolls
TYPICAL PEDON: Vangoe ashy loam - forest meadow, on an 8 percent south facing slope at an elevation of 4,400 feet. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures.)
A-- 0 to 7 inches; dark brown (10YR 3/3) ashy loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium granular structure; slightly hard, friable, slightly sticky and nonplastic; many very fine, fine and few medium roots; common very fine irregular pores; 5 percent gravel; slightly acid (pH 6.5), NaF pH 9.3; clear smooth boundary. (3 to 12 inches thick.)
AB-- 7 to 14 inches; brown (10YR 4/3) ashy loam, very dark grayish brown (10YR 3/2) moist; weak medium prismatic structure parting to moderate fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and common medium roots; common very fine irregular pores; 10 percent gravel; slightly acid (pH 6.5), NaF pH 9.2; clear smooth boundary. (3 to 7 inches thick.)
2Btl-- 14 to 33 inches; brown (10YR 4/3) stony clay loam, dark brown (10YR 3/3) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; hard, firm, moderately sticky and moderately plastic; common fine and medium roots; common very fine and fine tubular pores; many prominent clay films on faces of peds and in pores; 15 percent gravel, 5 percent cobbles, and 10 percent stones; slightly acid (pH 6.5), NaF pH 9.2: clear wavy boundary.
2Bt2-- 33 to 41 inches; dark yellowish brown (10YR 4/4) stony loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; common fine and few medium tubular pores; many prominent clay films on faces of peds; 5 percent gravel, 5 percent cobbles, and 15 percent stones; slightly acid (pH 6.5), NaF pH 9.2; clear smooth boundary. (Combined thickness of the 2Bt horizon is 10 to 38 inches.)
2BCt-- 41 to 48 inches; brown (10YR 4/3) stony loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure-, slightly hard, friable, slightly sticky and nonplastic; few fine roots; few fine tubular pores; common distinct clay films on faces of peds; 20 percent stones; slightly acid (pH 6.5), NaF pH 9.2; gradual smooth boundary. (5 to 20 inches thick.)
2R-- 48 inches; basalt bedrock.
TYPE LOCATION: Yakama Nation, Yakima County, Washington; about 4 miles northwest of Signal Peak Ranger Station; about 1,570 feet south and 914 feet west of the northeast corner of Section 4, T. 9 N, R. 13 E, Willamette Meridian; Latitude 46 degrees, 17 minutes, 51 seconds N and Longitude 121 degrees, 11 minutes, 26 seconds W. NAD 27.
RANGE IN CHARACTERISTICS: The average annual soil temperature at a depth of 20 inches ranges from 44 to 46 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 45 to 60 consecutive days following the summer solstice. The volcanic ash mantle (A and AB horizons) is 7 to 14 inches thick. It has an estimated moist bulk density of 0.75 to 0.85 grams per cubic centimeter, glass content of 5 to 30 percent, and acid oxalate extractable aluminum plus one-half of the acid oxalate extractable iron of 0.1 to 1.0 percent. The particle-size control section has 18 to 35 percent clay and 0 to 35 percent rock fragments. Depth to bedrock ranges from 40 to 60 inches. The mollic epipedon is 20 to 33 inches thick and includes the upper part of the argillic horizon.
The A and AB horizons have a value of 3 or 4 dry, 2 or 3 moist, and chroma of 2 or 3 dry or moist. Rock fragments range from 0 to 10 percent.
The 2Bt horizon has a hue of 10YR or 7.5YR, value of 3 through 5 dry, 2 or 3 moist, and chroma of 2through 4 moist or dry. Texture is clay loam, gravelly clay loam, stony clay loam or stony loam. Rock fragments range from 0 to 35 percent.
The 2BCt horizon has a hue of 10YR or 7.5YR, value of 4 or 5 dry, 3 or 4 moist, and chroma of 2 through 6 dry or moist. Texture is gravelly clay loam, stony loam or loam.
Rock fragments range from 5 to 35 percent.
COMPETING SERIES: These are the Bly, Bolobin, Bolony, Forbord, Hess, Lidos , Melhorn, Nibolob, Raycreek (T), Salcreek , and Spartabutte series. Bly soils have a duripan at 40 to 60 inches. Bolobin, Bolony, and Spartabutte soils are 20 to 40 inches deep to a lithic contact. Forbord soils are very deep and are dry for 75 to 90 consecutive days. Hess soils have a mollic epipedon 10 to 20 inches thick and 5 to 50 percent pararock fragments in the lower part of the particle-size control section. Lidos, Melhorn, and Salcreek soils have a mollic epipedon 10 to 20 inches thick and are very deep. Nibolob soils are dry for 60 to 75 consecutive days. Raycreek soils are 20 to 40 inches deep to a lithic contact. Soils with similar classification but mixed mineralogy include the Pinney and Powellbutte (T) series. Pinney soils are more than 60 inches to bedrock. Powellbutte soils are 20 to 40 inches to bedrock.
GEOGRAPHIC SETTING: Vangoe soils are on stream terraces and toeslopes. These soils formed in volcanic ash over alluvium and residuum from basalt. Slopes are 5 to 20 percent. Elevations are 2,500 to 4,500 feet. The climate is characterized by warm dry summers and cool moist winters. The average annual precipitation is 35 to 50 inches. The average annual temperature is 42 to 44 degrees F. The frost-free season is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Wanaishchit (T), Singh and Patu (T) soils. Wanaishchit soils are on plateaus and sideslopes, are ashy over loamy, and lack a mollic epipedon. Singh soils are on benches and sideslopes, are ashy over loamy-skeletal, and lack a mollic epipedon. Patu soils are on ridges, shoulders, and sideslopes and are loamy-skeletal, lack a mollic epipedon, and are moderately deep to basalt.
DRAINAGE AND PERMEABILITY: Well drained, medium runoff', moderately slow permeability.
USE AND VEGETATION: Dominant uses on Vangoe soils are livestock grazing, wildlife habitat, and recreation. Native vegetation includes pinegrass, yarrow, fescue and false hellebore with scattered ponderosa pine, lodgepole pine, and grand fir.
DISTRIBUTION AND EXTENT: Eastern slopes of the Cascade Mountains on the Yakama Nation, Yakima County Washington. MLRA 6. Series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Yakama Nation, Yakima County, Washington, 2004. Name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Mollic epipedon - 0 to 33 inches (A, AB, and 2Bt1 horizons)
Argillic horizon - 14 to 41 inches (2Bt horizon)
Vitrandic subgroup feature - 0 to 14 inches (A and AB horizons)
Particle-size control section - 14 to 34 inches (2Btl and upper 2 inches of the 2Bt2 horizon)
Values for andic soil properties, including glass content and acid oxalate extractable aluminum and iron, are estimated based on laboratory data from similar soils.
ADDITIONAL DATA: Partial laboratory data is available for this soil. Yakama Indian Nation soils laboratory, sample # 56B-4-2.