LOCATION TAAAX                   WA

Established Series
Rev. JMB/PNP/KDPL/SBC
09/2019

TAAAX SERIES

Landscape--plateaus, mountains
Landform--drainageways
Slope--0 to 35 percent
Parent material--volcanic ash deposits over mudflows or block-and-ash flows
Mean annual precipitation--about 1650 mm
Mean annual air temperature--about 3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy, amorphic Typic Vitricryands

TYPICAL PEDON: Taaax ashy sandy loam in an area of forestland, on a 4-percent, south-facing slope in a drainageway at an elevation of 1150 m (Textures are apparent field textures.)

Oi--0 to 5 cm; slightly decomposed forest litter, twigs, and cones

A--5 to 25 cm; ashy sandy loam, brown (10YR 4/3) dry, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; weakly smeary; many very fine and few medium and coarse roots; few fine irregular pores; slightly acid (pH 6.3), NaF pH 11.0; abrupt smooth boundary

Bw1--25 to 102 cm; ashy sandy loam, dark yellowish brown (10YR 4/4) dry, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; weakly smeary; common very fine and fine and few medium and coarse roots; common fine and few medium irregular pores; 5 percent gravel; slightly acid (pH 6.5), NaF pH 11.5; clear smooth boundary

2Bw2--102 to 163 cm; ashy fine sandy loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; common grayish brown (10YR 5/2) mottles; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; few very fine, fine, and medium roots; common fine and few medium tubular pores; 10 percent gravel; slightly acid (pH 6.5), NaF pH 11.5

TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 3 km south of Snowplow Mountain; about 600 m west and 125 m north of the southeast corner of section 15, T. 7 N., R. 11 E.; latitude 46.0891498, longitude -121.4139536, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature at a depth of 50 cm--5 to 6 degrees C

Particle-size control section
*Moist bulk density--0.75 to 0.90 g/cm3
*Glass content--5 to 30 percent
*Acid oxalate aluminum plus one-half iron--2 to 3 percent
*15-bar water retention--10 to 12 percent
*Phosphorus retention--70 to 85 percent

A horizon
Value--3 to 5 dry, 2 or 3 moist
Chroma--3 or 4 dry, 2 or 3 moist
Rock fragment content--0 to 5 percent
Thickness--13 to 38 cm

Bw horizon
Hue--7.5YR, 10YR
Value--3 to 5 dry, 2 to 4 moist
Chroma--3 or 4 dry or moist
Texture--ashy sandy loam, ashy loam, ashy silt loam
Rock fragment content--0 to 10 percent
Thickness--25 to 102 cm

2Bw horizon
Hue--7.5YR, 10YR
Value--3 or 4 dry, 2 or 3 moist
Chroma--3 or 4 dry or moist
Texture--ashy fine sandy loam, ashy loam, ashy silt loam
Rock fragment content--10 to 25 percent
Thickness--25 to 76 cm

COMPETING SERIES:
Castlecrest--60 to 90 percent volcanic glass in ash mantle
Foggyflat--100 to 150 cm (deep) to a lithic contact (basalt)
Hutson--phosphorus retention of more than 85 percent in particle size control section
Wawukyataak, Winegar--50 to 100 cm (moderately deep) to densic material

GEOGRAPHIC SETTING:
Elevation--1075 to 1675 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--1300 to 2000 mm
Mean annual air temperature--6 to 7 degrees C
Frost-free season--45 to 60 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Fiscus--on plateaus and side slopes; ashy-skeletal over loamy-skeletal; argillic horizon

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high

USE AND VEGETATION:
Use--timber production, livestock grazing, wildlife habitat, recreation
Native vegetation--subalpine fir, grand fir, lodgepole pine, Engelmann spruce, western larch, big huckleberry, queencup beadlily, beargrass, trillium

DISTRIBUTION AND EXTENT: East slopes of Cascade Mountains in south-central Washington; MLRA 6; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Yakama Nation, Yakima County, Washington; 2014

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 25 to 163 cm
*Andic soil properties--zone from 5 to 163 cm
*Particle-size control section--zone from 5 to 105 cm

Ta'aax is the Yakama word for gently sloping. The type location for this series is in a gently sloping area. The series originally was named the Zomax series.

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National Cooperative Soil Survey
U.S.A.