LOCATION DARLAND WA
Established Series
Rev. JPE/RJE/RWL
09/2019
DARLAND SERIES
Landscape--mountains
Landform--south-facing, convex mountain slopes
Slope--5 to 75 percent
Parent material--basalt colluvium mixed with loess and an influence of volcanic ash in the upper part
Mean annual precipitation--about 890 mm
Mean annual air temperature--about 6 degrees C
Depth class--deep, very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Vitrandic Haplocryolls
TYPICAL PEDON: Darland gravelly ashy loam, very stony surface, in an area of rangeland
A1--0 to 20 cm; gravelly ashy loam, dark yellowish brown (10YR 4/4) dry, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; few fine pores; 30 percent gravel, 1 percent cobbles, and less than 1 percent stones; neutral (pH 6.6); abrupt smooth boundary
A2--20 to 36 cm; very gravelly loam, brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) moist; moderate fine and medium granular structure; soft, friable, slightly sticky and slightly plastic; common fine and medium roots; few fine pores; 35 percent gravel and 5 percent cobbles; neutral (pH 6.6); clear wavy boundary
A3--36 to 79 cm; extremely cobbly loam, brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; 35 percent gravel and 25 percent cobbles; slightly acid (pH 6.4); clear wavy boundary
Bw--79 to 109 cm; extremely cobbly loam, dark yellowish brown (10YR 4/4) dry, brown (10YR 4/3) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; 15 percent gravel and 65 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary
C--109 to 150 cm; extremely cobbly sandy loam, dark yellowish brown (10YR 4/4) dry, dark brown (10YR 3/3) moist; single grain; loose, nonsticky and nonplastic; few fine and medium roots; 10 percent gravel, 65 percent cobbles, and 10 percent stones; slightly acid (pH 6.4)
TYPE LOCATION: Yakima County, Washington, about 9.5 km west of the Ahtanum Guard Station; about 880 m west and 780 m north of the southeast corner of section 23, T. 12 N., R. 13 E.; latitude 46.510254, longitude -121.158028, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Soil moisture control section-dry 45 to 60 days following the summer solstice (xeric regime)
Percentage of surface covered with stones--3 to 15 percent
Mean annual soil temperature--6 to 7 degrees C
Thickness of mollic epipedon--50 to 109 cm
Clay content in particle-size control section--10 to 18 percent
Rock fragment content in particle-size control section--35 to 80 percent; some scoriaceous
Depth to bedrock--100 to 150 cm or more
Description of bedrock--angular basalt; yellowish brown (10YR 5/4) weathering rind; cannot be broken by hand
Assumed properties of layer influenced by volcanic ash
*Thickness--20 to 50 cm
*Volcanic glass content--5 to 20 percent
*Acid oxalate aluminum plus one-half iron--0.4 to 1.0 percent
*Moist bulk density--1.10 to 1.30 g/cm3
A1 horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--3 or 4 dry, 2 or 3 moist
Texture of fine-earth fraction--ashy loam, ashy fine sandy loam
Rock fragment content--15 to 75 percent
Reaction--5.6 to 7.3
Thickness--18 to 48 cm
A2 horizon (where present), and A3 horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--3 or 4 dry, 2 or 3 moist
Rock fragment content--35 to 85 percent
Reaction--5.6 to 7.3
Thickness of A2 horizon--0 to 16 cm
Thickness of A3 horizon--33 to 46 cm
Bw horizon
Value--4 or 5 dry, 3 or 4 moist
Chroma--3 or 4 moist
Rock fragment content--35 to 85 percent
Reaction--5.6 to 7.3
Thickness--25 to 33 cm
C horizon (where present)
Value--4 or 5 dry
Chroma--3 or 4 moist
Texture of fine-earth fraction--sandy loam, loam
Rock fragment content--35 to 90 percent
Reaction--5.6 to 6.5
COMPETING SERIES:
Brickel--50 to 100 cm (moderately deep) to a lithic contact (granite)
GEOGRAPHIC SETTING:
Elevation--1525 to 2100 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--640 to 1775 mm
Mean January air temperature--about -6 degrees C
Mean July air temperature--about 17 degrees C
Mean annual air temperature--about 5 to 6 degrees C
Frost-free season--less than 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Naxing--no mollic epipedon
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--recreation, wildlife habitat
Vegetation--sagebrush, scarlet gilia, elk sedge, mountain parsley, balsamroot, pachystima
DISTRIBUTION AND EXTENT: Mountains of western Yakima County; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima County, Washington; 1979
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--zone from the surface to a depth of 79 cm
*Cambic horizon--zone from 79 to 109 cm
*Vitrandic feature--zone from the surface to a depth of 20 cm
*Pachic feature--zone from the surface to a depth of 79 cm
*Particle-size control section--zone from 25 to 100 cm
National Cooperative Soil Survey
U.S.A.