LOCATION DABOB WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Vitrandic Dystroxerepts
TYPICAL PEDON: Dabob very gravelly sandy loam - forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed and nondecomposed needles, leaves, bark, and wood fragments.
Oe--1 to 3 inches; dark reddish brown (5YR 2/2) partially decomposed needles, leaves, bark, and wood fragments; dark reddish gray (5YR 4/2) dry; strongly acid (pH 5.4); abrupt wavy boundary. (1 to 3 inches thick)
E--3 to 5 inches; dark gray (10YR 4/1) gravelly sandy loam, gray (10YR 6/1) dry; weak medium granular structure; soft, very friable, nonsticky, nonplastic; many fine, medium and coarse roots; 30 percent gravel; moderately acid (pH 5.8); abrupt wavy boundary. (1 to 3 inches thick)
Bs--5 to 16 inches; dark brown (7.5YR 4/4) very gravelly sandy loam, light brown (7.5YR 6/4) dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; many fine, medium and coarse roots; 55 percent gravel and 5 percent cobbles; 8 percent hard iron oxide concretions; moderately acid (pH 6.0); clear wavy boundary. (9 to 12 inches thick)
BC1--16 to 23 inches; dark brown (10YR 4/3) very gravelly sandy loam, pale brown (10YR 6/3) dry; common medium and coarse distinct strong brown (7.5YR 5/6) and few fine faint yellowish brown (10YR 5/6) redox concentrations; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine and medium roots; 65 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (6 to 8 inches thick)
BC2--23 to 31 inches; grayish brown (10YR 5/2) very gravelly sandy loam, light gray (10YR 7/2) dry; common medium and coarse distinct dark brown (7.5YR 4/4) redox concentrations; massive; hard, firm, nonsticky, nonplastic; few fine and medium roots; 60 percent gravel; slightly acid (pH 6.2); abrupt wavy boundary. (8 to 10 inches thick)
2Bsm--31 to 36+ inches; dark gray (10YR 4/1) gravelly sandy loam, light gray (10YR 6/1) dry; few fine distinct dark brown (7.5YR 4/4) and common medium distinct yellowish brown (10YR 5/6) redox concentrations; massive; extremely hard, extremely firm, weakly cemented, nonsticky, nonplastic; 45 percent fine gravel; slightly acid (pH 6.4).
TYPE LOCATION: Jefferson County, Washington; 480 feet west and 320 feet south of the east quarter corner of section 36, T. 28 N., R. 1 W.
RANGE IN CHARACTERISTICS: The solum is 16 to 28 inches thick. Depth to the cemented pan ranges from 24 to 33 inches. The mean annual soil temperature ranges from 47 degrees to 53 degrees F. The soils are strongly acid to slightly acid, becoming less acid with depth. These soils are usually moist but are dry in all parts between 8 and 24 inches for 60 to 75 consecutive days. They average 50 to 70 percent coarse fragments in the particle-size control section.
The E horizon has value of 3 or 4 moist and chroma of 1 or 2. It is gravelly sandy loam or very gravelly sandy loam.
The Bs horizon has value and chroma of 3 or 4 moist. It contains 5 to 10 percent iron-manganese shot.
The BC horizon has value of 4 or 5 moist and chroma of 2 through 4 moist. It has redox concentrations with chroma greater than 2 in some pedons.
The 2Bsm horizon has hue of 10YR or 2.5Y, value of 4 through 6 moist, and chroma of 1 or 2. It has redox concentrations with chroma greater than 2 in some pedons. It is weakly cemented.
COMPETING SERIES: These are the Alderwood, Baldhill, Beausite, Fidalgo, and Whistle series. The Alderwood soils lack an albic horizon andhave densic materials within 60 inches. The Baldhill soils are very deep and lack a cemented pan. The Beaustie and Fidalgo soils are 20 to 40 inches to a lithic contact. The Whislte soils are 40 to 60 inches to a lithic contact.
GEOGRAPHIC SETTING: The Dabob soils occur at elevations of 100 to 800 feet in undulating to hilly glacial upland. These soils formed in very gravelly ablation glacial material overlying extremely firm glacial till derived from mixed rock sources. The glacial till occurs at 24 to 36 inches in depth. The climate is cool and dry in the summer and mild and wet in the winter. Annual precipitation ranges from 25 to 45 inches. The average July temperature is 59 degrees F., the average January temperature is 29 degrees F., and the mean annual temperature is 49 degrees F. The growing season is about 258 days above 28 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alderwood, Everett, Hoypus, Kitsap, Olete, and Sinclair soils. Alderwood soils have a spodic horizon. Everett and Hoypus soils are sandy-skeletal and deep. Hoypus soils lack a paralithic contact at depths of less than 40 inches. Kitsap soils are fine-silty and deep. Olete soils are 20 to 40 inches deep to a lithic contact.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow to rapid runoff; moderately rapid permeability above the pan and very slow permeability in the pan. A perched water table is at 24 to 30 inches at times from November through March.
USE AND VEGETATION: Largely woodland. Native vegetation is western hemlock, Douglas-fir, and western redcedar, vine maple, salal, red huckleberry, western brackenfern, Oregongrape, trailing blackberry, evergreen huckleberry, and western swordfern.
DISTRIBUTION AND EXTENT: Northwestern Washington. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grays Harbor County Area, Washington, 1970.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy. This soil has the morphology of a Spodosol (3/24/94) if the albic horizon is not a volcanic ash layer. Classification changed 1/2000 from Vitrandic Durochrepts to Vitrandic Dystroxerepts based on revision to Soil Taxonomy.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon
Albic horizon - from 3 to 5 inches
Cambic horizon - from 5 to 31 inches
Cemented pan - beginning at 31 inches and cemented with aluminum, iron, and organic matter.
Vitrandic subgroup feature - from 3 to 31 inches having estimated properties of > 5 percent volcanic glass and 0.4 to 1.0 percent acid-oxalate Al plus 1/2 Fe.
Oxyaquic feature - a perched water table from 24 to 30 inches at times from November through March.
Particle-size control section - from 13 to 31 inches.
Depths to diagnostic horizons and features as noted in range of characteristics are measured from the to of the first mineral horizon.