LOCATION TNUUN WA
Established Series
Rev. PNP/KDPL/SBC
09/2019
TNUUN SERIES
Landscape--mountains, plateaus
Landform--mountain slopes, structural benches
Slope--0 to 90 percent
Parent material--volcanic ash over basalt and ashflow deposits
Mean annual precipitation--about 1300 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy-skeletal, mixed Humic Xeric Vitricryands
TYPICAL PEDON: Tnuun ashy sandy loam in an area of forestland, on a 16-percent, southwest-facing slope at an elevation of 1450 m (All textures are apparent field textures.)
Oi--0 to 5 cm; slightly decomposed needles, twigs, and cones mixed with a small amount of 1980 Mount St. Helens volcanic ash; abrupt smooth boundary
A--5 to 10 cm; ashy sandy loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; common fine, medium, and coarse roots; common very fine irregular pores; 10 percent gravel; strongly acid (pH 5.5), NaF pH 9.8; clear smooth boundary
Bw1--10 to 38 cm; ashy sandy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; moderate fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; many fine and common medium and coarse roots; common very fine and fine irregular pores; 10 percent gravel; slightly acid (pH 6.5), NaF pH 9.8; gradual irregular boundary
2Bw2--38 to 99 cm; very stony ashy sandy loam, yellowish brown (10YR 5/6) dry, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; common fine and few medium and coarse roots; common fine and few medium irregular pores; 20 percent gravel, 15 percent cobbles, and 15 percent stones; neutral (pH 6.8), NaF pH 9.8; gradual wavy boundary
2Bw3--99 to 165 cm; very gravelly ashy fine sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; hard, friable, nonsticky and nonplastic; weakly smeary; few fine roots; few fine irregular pores; 40 percent gravel and 10 percent cobbles; strongly acid (pH 5.5), NaF pH 9.8
TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 5 km southeast of Jennies Butte; about 790 m north and 640 m east of the southwest corner of section 6, T. 10 N., R. 13 E.; latitude 46.381087, longitude -121.241338, datum WGS 84 (coordinates estimated from section, township, and range)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature at a depth of 50 cm--6 to 7 degrees C
Mean summer soil temperature--7 to 8 degrees C
Moisture control section--usually moist, but dry in all parts 45 to 60 consecutive days following summer solstice
Thickness of umbric epipedon--25 to 53 cm
Rock fragment content in particle-size control section--5 to 15 percent in upper part, 35 to 80 percent in lower part, weighted average of 35 to 60 percent
Ashy-skeletal particle-size control section
*Moist bulk density--0.75 to 0.85 g/cm3
*Glass content--5 to 30 percent
*Acid oxalate aluminum plus one-half iron--2 to 3 percent
*15-bar water retention--8 to 12 percent (air-dried samples)
Oi horizon
Thickness--3 to 10 cm
A horizon
Hue--10YR, 7.5YR
Value--4 or 5 dry, 3 or 4 moist
Chroma--2 or 3 dry or moist
Thickness--5 to 23 cm
Bw horizon
Hue--10YR, 7.5YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Texture of fine-earth fraction--ashy sandy loam
Rock fragment content--5 to 15 percent
Reaction--5.1 to 6.5
Thickness--10 to 30 cm
2Bw horizon
Hue--10YR, 7.5YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--3 to 6 moist or dry
Texture of fine-earth fraction--ashy fine sandy loam, ashy sandy loam
Rock fragment content--35 to 80 percent
Reaction--5.1 to 6.5
Combined thickness--greater than 87 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--980 to 1800 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--1000 to 1500 mm
Mean annual air temperature--3 to 6 degrees C
Frost-free season--40 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Snowplow--on benches and side slopes; ashy particle-size class
Niiptit--on ridgetops and side slopes; ashy over loamy particle-size class; 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, watershed
Native vegetation--lodgepole pine, western larch, subalpine fir, blue huckleberry, queencup beadlily, sedges, beargrass, pinegrass
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
*Umbric epipedon--zone from 5 to 38 cm
*Andic soil properties--zone from 5 to 165 cm
*Cambic horizon--zone from 38 to 165 cm
*Particle-size control section--zone from 5 to 105 cm
Tnuun is the Yakama word for bighorn sheep, which roam in and around the type location of this series. The series originally was named the McCreedy series.
National Cooperative Soil Survey
U.S.A.