LOCATION MUULMUUL                WA

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

MUULMUUL SERIES

Landscape--mountains
Landform--benches, mountain slopes
Slope--0 to 70 percent
Parent material--loess and residuum and colluvium derived from basalt
Mean annual precipitation--about 640 mm
Mean annual air temperature--about 7 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Ultic Argixerolls

TYPICAL PEDON: Muulmuul sandy loam in an area of forestland, on a 54-percent, north-facing slope at an elevation of 990 m (All textures are apparent field textures.)

Oi--0 to 5 cm; slightly decomposed needles, twigs, and leaves

A1--5 to 15 cm; sandy loam, brown (7.5YR 4/2) dry, dark brown (7.5YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine and medium roots; common fine irregular pores; 5 percent gravel; slightly acid (pH 6.3); clear smooth boundary

A2--15 to 48 cm; fine sandy loam, brown (7.5YR 5/2) dry, dark brown (7.5YR 3/2) moist; weak coarse subangular blocky structure parting to weak fine and medium subangular blocky; soft, very friable, nonsticky and slightly plastic; common very fine, fine, medium, and coarse roots; few fine and medium irregular pores; 5 percent gravel and 5 percent cobbles; moderately acid (pH 6.0); gradual wavy boundary

BA--48 to 84 cm; silt loam, light brown (7.5YR 6/4) dry, dark brown (7.5YR 3/4) moist; weak coarse subangular blocky structure parting to weak fine and medium subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots; common very fine and few fine tubular pores; 10 percent gravel; moderately acid (pH 6.0); clear wavy boundary

Bt1--84 to 117 cm; gravelly loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and few coarse roots; common very fine and few fine tubular pores; 15 percent gravel; common faint clay films on faces of peds; slightly acid (pH 6.3); clear wavy boundary

Bt2--117 to 155 cm; gravelly loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common very fine and fine tubular pores; 25 percent gravel; common faint and few distinct clay films on faces of peds; moderately acid (pH 6.0); clear smooth boundary

TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 3 km northeast of Millcreek Guard Station; about 140 m south and 560 m east of the northwest corner of section 14, T. 9 N, R. 15 E.; latitude 46.2714901, longitude -120.9094873, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature at a depth of 50 cm--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 mollic epipedon--30 to 45 cm
Particle-size control section--averages 18 to 30 percent clay and 15 to 35 percent hard rock fragments
Bulk density in mollic epipedon--1.3 to 1.5 g/cm3
Base saturation (by sum of cations) in upper 25 cm of mineral soil--45 to 56 percent

A horizon
Hue--7.5YR, 10YR
Value--4 or 5 dry
Chroma--2 or 3 dry or moist
Rock fragment content--5 to 15 percent basalt gravel and cobbles
Combined thickness--28 to 43 cm

BA horizon
Hue--7.5YR, 10YR
Value--5 or 6 dry
Chroma--3 or 4 dry or moist
Texture--gravelly sandy loam, gravelly loam, sandy loam, loam, silt loam
Clay content--8 to 19 percent
Rock fragment content--10 to 25 percent basalt gravel and cobbles
Thickness--13 to 36 cm

Bt horizon
Hue--7.5YR, 10YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--3 or 4 dry or moist
Texture--gravelly loam, cobbly loam, gravelly clay loam
Clay content--18 to 30 percent
Rock fragment content--15 to 35 percent basalt gravel and cobbles
Combined thickness--38 to 89 cm

COMPETING SERIES:
Carmack, Middlefork--less than 15 percent rock fragments in particle-size control section
Elkcreek--50 to 100 cm (moderately deep) to a lithic contact (andesite, rhyolite, welded tuft, basalt)
Johnson--0 to 30 percent granitic and metamorphic rock fragments in argillic horizon
Mojo--75 to 100 cm (moderately deep) to a lithic contact (igneous rock)
Molyneux, Simonton, Skelter--no O horizon; dry in moisture control section more than 60 consecutive days
Muldoon--100 to 150 cm (deep) to a duripan
Suloaf--100 to 150 cm (deep) to a lithic contact (basalt)

GEOGRAPHIC SETTING:
Elevation--850 to 1400 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--510 to 760 mm
Mean annual air temperature--6 to 8 degrees C
Frost-free season--95 to 130 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Lyville--on benches, plateaus, and side slopes; loamy-skeletal particle-size class; no argillic horizon; mesic soil temperature regime
Meystre--on upland benches; less than 12 percent rock fragments in particle-size control section; mesic soil temperature regime
Stemilt--on mountain side slopes and benches; loamy-skeletal particle-size class

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

USE AND VEGETATION:
Use--timber production, livestock grazing, recreation, wildlife habitat
Native vegetation--Douglas-fir, grand fir, western larch, ponderosa pine, white spirea, California hazel, trailing snowberry, common prince's pine, pinegrass, elk sedge

DISTRIBUTION AND EXTENT: Eastern slopes of the Cascade Mountains, Yakama Nation, Yakima County, 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
*Mollic epipedon--zone from 5 to 48 cm
*Argillic horizon--zone from 84 to 155 cm
*Particle-size control section--zone from 84 to 135 cm

Muul is the Yakama name for a spring near Fort Simcoe. The type location for this series is southwest of Muul (Mool Mool) Spring. This series originally was named the Moolmool series.

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National Cooperative Soil Survey
U.S.A.