LOCATION SLIDECAMP WAEstablished Series
TAXONOMIC CLASS: Fine, isotic, frigid Oxyaquic Vertic Glossudalfs
TYPICAL PEDON: Slidecamp loam-forestland, on a 23 percent north-facing slope at an elevation of 2,420 feet in a western hemlock/Pacific rhododendron-salal plant association. (Colors are for moist soil unless otherwise stated.) When described on May 26, 1993, the soil was moist throughout. (All textures are apparent field textures.)
Oi--0 to 2 inches; slightly decomposed wood fragments, leaves, and needles; abrupt smooth boundary. (1 to 3 inches thick)
E--2 to 6 inches; olive brown (2.5Y 4/3) loam, light gray (2.5Y 7/2) dry; weak very fine, fine, and medium subangular blocky and weak very fine granular structure; hard, firm, sticky and plastic; many very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 10 percent gravel; strongly acid (pH 5.1); clear smooth boundary. (3 to 10 inches thick)
E/Bt--6 to 11 inches; 70 percent olive brown (2.5Y 4/3) pale yellow (2.5Y 7/3) dry (E) and 30 percent dark yellowish brown (10YR 4/4) (Bt) loam; moderate fine, medium, and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; common distinct clay films on faces of peds and lining pores; few fine distinct dark brown (7.5YR 3/4) irregularly shaped masses of iron accumulation with diffuse boundaries in the matrix; common fine distinct light yellowish brown (2.5Y 6/3) irregularly shaped iron depletions with diffuse boundaries in the matrix; 10 percent gravel; strongly acid (pH 5.4); clear smooth boundary.
Bt/E--11 to 16 inches; 50 percent olive brown (2.5Y 4/4) pale yellow (2.5Y 7/3) dry (E) and 50 percent dark yellowish brown (10YR 4/4) (Bt) silty clay loam; moderate medium and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium and coarse roots; common very fine and fine tubular and irregular pores; common distinct clay films on faces of peds and lining pores; common fine distinct dark brown (7.5YR 4/4) irregularly shaped masses of iron accumulation with clear boundaries in the matrix; common medium distinct light yellowish brown (2.5Y 6/3) irregularly shaped iron depletions with clear boundaries in the matrix; 10 percent gravel; moderately acid (pH 5.9); clear smooth boundary. (Combined thickness of the E/Bt and BtE horizon is 7 to 13 inches.)
Bt1--16 to 20 inches; light olive brown (2.5Y 5/3) gravelly silty clay; moderate fine, medium, and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine tubular and irregular pores; common distinct brown (10YR 5/3) clay films on faces of peds and lining pores; many medium distinct light yellowish brown (2.5Y 6/3) iron depletions and many fine distinct strong brown (7.5Y 4/6) iron accumulations; 15 percent gravel; neutral (pH 6.6); clear smooth boundary.
Bt2--20 to 27 inches; olive brown (2.5Y 4/3) gravelly silty clay, pale yellow (2.5Y 7/4) dry; moderate fine, medium, and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine roots; few very fine tubular and irregular pores; many distinct yellowish brown (10YR 5/4) clay films on faces of peds and lining pores; few fine distinct strong brown (7.5YR 4/6) irregularly shaped masses of iron accumulation with clear boundaries in the matrix; 15 percent gravel; neutral (pH 6.8); clear wavy boundary. (Combined thickness of the Bt horizon is 10 to 20 inches.)
2Bt3--27 to 46 inches; olive brown (2.5Y 4/3) gravelly silty clay loam, pale yellow (2.5Y 7/3) dry; moderate medium and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine roots; few very fine tubular and irregular pores; many distinct brown (10YR 4/3) clay films on faces of peds and lining pores; 20 percent gravel; neutral (pH 7.0); clear wavy boundary.
2Bt4--46 to 62 inches; olive brown (2.5Y 4/3) gravelly silty clay loam, light gray (2.5Y 7/2) dry; moderate medium and coarse subangular blocky structure; very hard, very firm, moderately sticky and moderately plastic; few very fine roots; few very fine tubular and irregular pores; many distinct brown (10YR 4/3) clay films on faces of peds and lining pores; 20 percent gravel; neutral (7.2).
TYPE LOCATION: Clallam County, Washington, about 1.5 miles south of Bear Mountain, about 2,200 feet east and 90 feet north of the southwest corner of section 4, T. 28 N., R. 3 W. (Latitude 47 degrees, 57 minutes, 25 seconds N., Longitude 123 degrees, 05 minutes, 01 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 45 to 47 degrees F. These soils are usually moist, and are dry 30 to 45 consecutive days in the soil moisture control section. The particle-size control section averages 0 to 25 percent rock fragments by volume and 35 to 45 percent clay. Bulk density is 1.40 to 1.80 grams per cubic centimeter. A perched water table is present above the 2Bt horizon for 120 to 180 cumulative days. Depth to the 2Bt horizon is 24 to 40 inches. Depth to the glossic horizon and redox features is 3 to 10 inches. The soil to a depth of 40 inches has an estimated linear extensibility of 2 to 3 inches.
The E horizon has hue of 2.5Y or 10YR moist and dry, value of 3 or 4 moist and 6 or 7 dry, and chroma of 3 or 4 moist and 2 or 3 dry. Reaction is strongly or moderately acid. Base saturation by sum of bases is 35 to 50 percent.
The E/Bt and Bt/E horizon for the E portion has value of 4 or 5 moist and 6 or 7 dry and chroma of 3 or 4 moist and 2 or 3 dry. The Bt portion has hue of 2.5Y or 10YR moist and value of 5 or 6 dry. It is loam, clay loam, silty clay loam, or gravelly clay loam. Texture of E and Bt material are the same. Reaction is strongly or moderately acid. Albic materials comprise 50 to 85 percent of the horizon. It has 25 to 40 percent clay content.
The Bt horizon has value of 4 or 5 moist and 6 or 7 dry and chroma of 3 or 4 dry. It is gravelly silty clay, gravelly silty clay loam, or gravelly clay loam. Reaction is moderately acid, slightly acid, or neutral. Base saturation by sum of bases is 75 to 90 percent. It has 35 to 45 percent clay content.
The 2Bt horizon has hue of 2.5Y or 5Y moist and dry, value of 6 or 7 dry, and chroma of 2 or 3 moist. It is gravelly silty clay loam, silty clay, or clay. Reaction is slightly acid or neutral. Base saturation by sum of bases is 75 to 100 percent. It has 35 to 50 percent clay content.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Slidecamp soils are on low relief, dissected uplands and have slopes of 5 to 60 percent. The soils formed in residuum and colluvium from proglacial lake deposits. Elevations are 1,850 to 2,850 feet. Average annual precipitation ranges from 35 to 50 inches. Average annual temperature is 43 to 45 degrees F. The frost-free season is 160 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bonjon, Graywolf, Halfoss, Juandefuca, Maidenpeak, Pennycreek, Station, Tunnelcreek, and Wellesley soils. Bonjon and Wellesley soils are in glaciated valleys, are 40 to 60 inches deep to dense till, and are moderately well drained. Graywolf soils are on low relief, dissected uplands and are moderately well drained and loamy-skeletal. Halfoss, Juandefuca, Maidenpeak, Pennycreek, Station, and Tunnelcreek soils are on mountain slopes and are well drained.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow permeability. The soils have a perched zone of saturation between 1.0 and 3.0 feet from November through April; 120 to 180 cumulative days.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is western hemlock, Douglas-fir, western redcedar, grand fir, Pacific rhododendron, salal, western swordfern, and Oregon-grape.
DISTRIBUTION AND EXTENT: Clallam County, Washington; MLRA 1. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 2000; Olympic National Forest.
REMARKS: Diagnostic horizons and features recognized in this pedon are the following:
Ochric epipedon
Albic horizon - 2 to 6 inches (E horizon)
Glossic horizon - 6 to 16 inches (E/Bt1 and E/Bt2 horizons)
Argillic horizon - 11 to 62 inches (Bt1, Bt2, 2Bt3, and 2Bt4 horizons)
Oxyaquic feature - perched water table is at its highest depth between the months of November through April and is present for 120 to 180 cumulative days.
PSCS - 11 to 31 inches (Bt1, Bt2, and 2Bt3 horizons)
The soils formed in relic proglacial lake deposits in a wetter environment. The presence of albic materials and redox features in the upper most horizons were not formed from present day pedogenesis.
Depth to diagnostic horizons and features are measured from the top of the first mineral horizon. Based on the color combinations in the glossic horizon some pedons will classify as aquertic subgroup and are considered taxadjuncts.
ADDITIONAL DATA: NSSL pedon number 94P0072; taxadjunct.