LOCATION LYNNWOOD WAEstablished Series
TAXONOMIC CLASS: Sandy, mixed, mesic Entic Haplorthods
TYPICAL PEDON: Lynnwood loamy sand - forested. (Colors are for moist soil unless otherwise noted.)
Oi--3 to 2 inches; leaves, needles, and twigs.
Oa--2 inches to 0; decomposed mat of needles, twigs, and leaves.
E--0 to 1 inch; grayish brown (10YR 5/2) loamy sand,light gray (10YR 7/2) dry; weak fine subangular blocky structure; soft, very friable; common fine and medium roots; many very fine pores; strongly acid (pH 5.2); clear smooth boundary. (0 to 2 inches thick)
Bs1--1 to 7 inches; dark brown (7.5YR 4/4) loamy sand, light brown (7.5YR 6/4) dry; weak medium subangular blocky structure; soft, very friable; common fine and medium roots; many very fine pores; many semi- rounded concretions 1 to 1/2 mm in size; strongly acid (pH 5.2); clear smooth boundary. (4 to 8 inches thick)
Bs2--7 to 15 inches; dark brown (7.5YR 4/4) loamy sand, light brown (7.5YR 6/4) dry; weak medium subangular blocky structure; soft, very friable; common fine and medium roots; many very fine interstitial pores; strongly acid (pH 5.4); clear smooth boundary. (8 to 14 inches thick)
BC--15 to 29 inches; dark yellowish brown (10YR 4/4) loamy sand, light yellowish brown (10YR 6/4) dry; massive; soft, very friable; common fine and medium roots; slightly acid (pH 6.4); abrupt smooth boundary. (15 to 28 inches thick)
C--29 to 60 inches; grayish brown (2.5Y 5/2) sand, light gray (2.5Y 7/2) dry; single grained; loose; few fine and medium roots; medium acid (pH 5.6).
TYPE LOCATION: Snohomish County, Washington; about 5 miles north of Arlington; 2,600 feet west and 980 feet north of the southeast corner of sec. 22, T. 31 N., R. 5 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is estimated to range from 47 to 50 degrees F. The series control section contains 0 to 15 percent rock fragments. These soils are usually moist but are dry in the moisture control section for 60 to 75 consecutive days following the summer solstice.
The E horizon has value of 4 or 5 moist, 6 through 8 dry, and chroma of 1 through 3 moist or dry. It has weak fine granular or weak fine subangular blocky structure. Some pedons have a thin A horizon.
The Bs horizon has hue of 7.5YR or 5YR, value of 3 through 5 moist, 4 through 6 dry, and chroma of 3 through 6 moist or dry. It is loamy and or loamy fine sand. This horizon has weak fine granular or weak fine subangular blocky structure. It is strongly acid or medium acid. The BC horizon has colors intermediate between the Bs and C horizons and is massive or single grained.
The C horizon has hue of 10YR, 2.5Y or 5Y, value of 4 through 6 moist, 5 through 7 dry, and chroma of 2 through 4 moist or dry. It ranges from loamy fine sand to sand. This horizon ranges from strongly acid to neutral.
COMPETING SERIES: These are the Covert, Grattan, and Netarts series in the same family and the Greenwater, Indianola, Lynden, and Pilchuck series. Covert, Grattan, and Netarts soils are not dry in the moisture control section for as long as 60 consecutive days following summer solstice. Also, Netarts soils have a mean annual soil temperature of about 54 degrees F. Greenwater, Indianola, and Pilchuck soils lack a spodic horizon. Lynden soils are sandy loam in the spodic horizon.
GEOGRAPHIC SETTING: Lynnwood soils are on glacial outwash terraces at elevations ranging from 50 to 500 feet. They formed in sandy glacial drift. Slopes are 0 to 90 percent. The soils are in a maritime climate of cool, dry summers and mild, wet winters. Mean annual precipitation ranges from 40 to 65 inches. The average January temperature is 37 degrees F, the average July temperature is 65 degrees F, and mean annual temperature is 50 degrees F. The frost-free season ranges from 180 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alderwood, Everett, and Tokul soils and the competing Indianola and Lynden soils. Alderwood and Tokul soils have an ortstein layer at a depth of 20 to 40 inches. Everett soils are sandy-skeletal.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; moderate permeability.
USE AND VEGETATION: Used for woodland, and cropland and pasture. Native vegetation is Douglas-fir, western hemlock, western redcedar, and red alder, with an understory of salal, Oregon-grape, red huckleberry, western brackenfern, and moss.
DISTRIBUTION AND EXTENT: This soil is of small extent in the Puget Sound Basin of western Washington.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Snohomish County, Washington, 1979.
REMARKS: Partial laboratory data are available on this soil NSSL #79T7529-7530. Diagnostic horizons and features recognized in this pedon are an albic horizon from the mineral surface to 1 inches and a spodic horizon from 1 to 15 inches. Some pedons meet chemical criteria for a spodic horizon and some do not. All pedons meet micro morphological criteria of cracked coatings and silt-sized and larger pellets.