LOCATION AYOCK WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic Oxyaquic Glossocryalfs
TYPICAL PEDON: Ayock very gravelly loam - forestland, on a 35 percent slope with a northwesterly aspect at an elevation of 3,000 feet in a Pacific silver fir/Pacific rhododendron plant association. (When described on February 27, 1992, the soil was moist throughout. Colors are for moist soil unless otherwise stated.)
Oi--0 to 2 inches; slightly decomposed needles, leaves, and wood fragments; abrupt smooth boundary. (0.5 to 2 inches thick)
E--2 to 14 inches; dark yellowish brown (10YR 3/4) very gravelly loam, very pale brown (10YR 7/3) dry; weak very fine subangular blocky and weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 30 percent gravel, 10 percent cobbles; strongly acid (pH 5.4); clear wavy boundary. (5 to 13 inches thick)
E/Bt1--14 to 22 inches; 70 percent olive brown (2.5Y 4/4) moist, pale yellow (2.5Y 7/3) dry (E) and 30 percent dark yellowish brown (10YR 4/6) (Bt) very gravelly loam; weak very fine and fine subangular blocky and weak fine granular structure; slightly hard, friable, moderately sticky and slightly plastic; common very fine, fine, and medium roots; common very fine tubular and irregular pores; common faint dark yellowish brown (10YR 3/4) 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; few fine distinct yellowish brown (10YR 5/4) irregularly shaped iron depletions with clear boundaries in the matrix; 40 percent gravel, 10 percent cobbles; strongly acid (pH 5.4); clear wavy boundary.
E/Bt2--22 to 32 inches; 55 percent olive brown (2.5Y 4/4) moist, pale yellow (2.5Y 7/3) dry (E) and 45 percent dark yellowish brown (10YR 4/6) (Bt) very gravelly clay loam; weak very fine, fine, and medium subangular blocky and weak fine granular structure; hard, firm, moderately sticky and moderately plastic; few very fine, fine, and medium roots; few very fine and fine tubular and irregular pores; common distinct 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; common fine distinct yellowish brown (10YR 5/4) irregularly shaped iron depletions with clear boundaries in the matrix; 30 percent gravel, 10 percent cobbles; strongly acid (pH 5.4). (Combined thickness of the E/Bt horizon is 15 to 23 inches.)
Bt/E--32 to 37 inches; 65 percent dark yellowish brown (10YR 4/4) (Bt) and 35 percent light olive brown (2.5Y 5/3), pale yellow (2.5Y 8/3) dry (E) very gravelly clay loam; weak 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 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; common fine distinct olive brown (2.5Y 4/3) irregularly shaped iron depletions with clear boundaries in the matrix; 35 percent gravel, 10 percent cobbles; moderately acid (pH 5.6); clear wavy boundary. (4 to 10 inches thick)
2Bt1--37 to 44 inches; light olive brown (2.5Y 5/4) very gravelly clay loam; weak fine, medium, and coarse subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; few very fine tubular and irregular pores; common distinct 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; common fine and medium distinct olive brown (2.5Y 4/3) irregularly shaped iron depletions with clear boundaries in the matrix; 25 percent gravel, 15 percent cobbles; moderately acid (pH 5.6); clear wavy boundary.
2Bt2--44 to 62 inches; light olive brown (2.5Y 5/4) very gravelly clay loam; weak very fine, fine, and medium subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; few very fine tubular and irregular pores; few distinct 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; common fine and medium distinct olive brown (2.5Y 4/3) irregularly shaped iron depletions with clear boundaries in the matrix; 35 percent gravel, 15 percent cobbles; slightly acid (pH 6.4).
TYPE LOCATION: Clallam County, Washington, about 1.25 miles north of Mt. Zion, about 790 feet east and 660 feet north of the southwest corner of Section 1, T. 28 N., R. 3 W. (Latitude 47 degrees, 56 minutes, 33 seconds N.,Longitude 123 degrees, 00 minutes, 28 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 43 to 45 degrees F. The mean summer soil temperature is 45 to 47 degrees F. The mean winter soil temperature is 40 to 44 degrees F. These soils are usually moist, and are dry 30 to 45 consecutive days in the soil moisture control section; udic moisture regime. The particle-size control section has 35 to 75 percent rock fragments by volume and 25 to 35 percent clay. Depth to redox concentrations and the glossic horizon is 5 to 13 inches. The glossic horizon is 20 to 30 inches thick.
The E horizon has hue of 10YR or 2.5Y moist and dry, value of 3 or 4 moist and 6 or 7 dry, and chroma of 4 or 6 moist and 2 or 3 dry.
The E/Bt horizon for the E portion has hue of 2.5Y or 10YR moist and dry, value of 4 or 5 moist, 6 or 7 dry and chroma of 3 or 4 moist and 2 or 3 dry. The Bt portion has hue of 10YR or 7.5YR moist and dry and chroma of 4 or 6 moist. It is very gravelly loam, very gravelly clay loam, or extremely 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.
The Bt/E horizon for the Bt portion has hue of 10YR or 2.5Y moist and dry and value of 6 or 7 dry. The E portion has value of 4 or 5 moist, 6 to 8 dry and chroma of 3 or 4 moist and 2 or 3 dry. It is very gravelly clay loam, very gravelly loam, or extremely gravelly clay loam. Texture of Bt and E material are the same. Albic materials comprise 25 to 50 percent of the horizon.
The 2Bt horizon has hue of 2.5Y or 10YR moist and dry, value of 4 or 5 moist and 6 or 7 dry, and chroma of 3 or 4 moist. It is very gravelly clay loam, very gravelly loam, or extremely gravelly clay loam. Reaction is moderately or slightly acid.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Ayock 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 and continental glacial till. Elevations are 2,750 to 3,500 feet. Average annual precipitation ranges from 40 to 70 inches. Average annual temperature is 41 to 43 degrees F. The frost-free season is 130 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bungalow, Mueller, Silverhorn, and Tylerpeak soils. Bungalow soils are on mountain slopes and are 4 to 10 inches to bedrock. Mueller and Tylerpeak soils are on mountain slopes. Mueller soils are well drained and Tylerpeak soils are 20 to 40 inches to bedrock. Silverhorn soils are on low relief, dissected uplands and are fine textured.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately slow permeability. Ayock soils have an apparent water table in which the soil is saturated for very brief or brief periods following a storm event. Total cumulative saturation time of the soil is estimated to be less than 30 days. The soils have an apparent 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, Pacific silver fir, Douglas-fir, western redcedar, Pacific rhododendron, northern twinflower, and vine maple.
DISTRIBUTION AND EXTENT: Clallam County, Washington; MLRA 3. 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 14 inches (E horizon)
Glossic horizon - 14 to 37 inches (E/Bt1, E/Bt2, and Bt/E subhorizons)
Argillic horizon - 14 to 62 inches (E/Bt1, E/Bt2, Bt/E, 2Bt1, and 2Bt2 subhorizons)
Oxyaquic feature - apparent water table is at its highest depth between the months of November through April and is present for 120 to 180 cumulative days.
PSCS - 14 to 34 inches (E/Bt1, E/Bt2, and Bt/E subhorizons)
The soils formed in relic proglacial lake deposits in a wetter environment. The presence of the albic materials and redox features in the upper most horizons were not formed from present day pedogenesis.
Depth to diagnostic horizons and other 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 aquic subgroup and are considered taxadjuncts.