LOCATION COPALISROCK WAEstablished Series
TAXONOMIC CLASS: Fine-silty, isotic, acid, isomesic Histic Humaquepts
TYPICAL PEDON: Copalisrock peat, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 3 inches; brown (10YR 5/3) peat, pale brown (10YR 6/3) dry; clear smooth boundary.
Oa--3 to 8 inches; black (10YR 2/1) muck, very dark gray (10YR 3/1) dry; common very fine and fine roots throughout; extremely acid (pH 4.2); gradual smooth boundary. Combined thickness of the O horizon is 8 to 16 inches)
Bg--8 to 14 inches; black (10YR 2/1) mucky silt loam, very dark gray (10YR 3/1) dry; weak medium and coarse subangular blocky structure; very hard, friable, slightly sticky and moderately plastic; common very fine and very coarse roots throughout; few fine dendritic tubular and common medium irregular pores; extremely acid (pH 4.2); clear smooth boundary. (4 to 12 inches thick)
Cg--14 to 29 inches; grayish brown (10YR 5/2) silt loam, white (10YR 8/1) dry; weak medium subangular blocky structure; hard, firm, moderately sticky and very plastic; few very fine roots throughout; common fine dendritic tubular and common medium irregular pores; many medium prominent brownish yellow (10YR 6/8) and brownish yellow (10YR 6/6) dry, irregularly shaped masses of iron accumulation with clear boundaries in the matrix; strongly acid (pH 5.2); abrupt smooth boundary. ( 8 to 20 inches thick)
2Cd--29 to 39 inches; grayish brown (10YR 5/2) extremely gravelly sandy loam, light gray (2.5Y 7/2) dry; massive; very hard, firm, nonsticky and nonplastic; 65 percent gravel, 2 percent cobbles; moderately acid (pH 5.6).
TYPE LOCATION: Grays Harbor County, Washington; about 2 miles traveling north on the Aloha mainline road; 500 feet south and 1,650 feet west of the northeast corner of sec. 26, T. 21 N., R. 12 W.; Latitude 47 degrees, 17 minutes, 13 seconds North and Longitude 124 degrees, 9 minutes, 59 seconds West.
RANGE IN CHARACTERISTICS: Thickness of the histic epipedon is 8 to 16 inches. Depth to densic material (dense glacial till) is 20 to 30 inches from the mineral soil surface. The content of rock fragments in the control section ranges from 0 to 5 percent. The mean annual soil temperature is 47 to 50 degrees F. The difference between mean summer and mean winter soil temperature is 5 to 7 degrees F. The soil is saturated to the surface from November to May.
The O horizon consists of peat, muck peat or muck with 30 to 100 percent organic matter.
The Bg horizon has nue of 10YR, value of 2 moist, 3 dry and chroma of 1 or 2 moist and dry. It has 10 to 30 percent organic matter. It is extremely or very strongly acid. It is mucky silt loam with 18 to 27 percent clay and 50 to 70 percent silt; field estimated.
The Cg horizon has hue of 10YR moist and dry, value of 4 or 5 moist and 6 through 8 dry, and chroma of 1 or 2 moist and dry. It has 2 to 10 percent organic matter. It is very strongly or strongly acid. The field estimated clay and silt percent is similar to the Bg horizon.
The 2Cd horizon has hue of 2.5Y or 10YR moist and dry, value of 5 moist and 7 dry, and chroma of 2 or 3 moist and 2 through 4 dry. It is extremely gravelly loamy sand, very gravelly loamy sand, extremely gravelly sandy loam or very gravelly sandy loam. It has 50 to 80 percent rock fragments, dominantly gravel size. Moist bulk density is 1.70 to 2.00 g/cc.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: These soils occur at elevations of 10 to 660 feet on glacial outwash terraces on till plains. Slopes are 0 to 3 percent. The soils formed in silty glaciolacustrine deposits over gravelly glacial outwash. The climate is cool, wet winters with cool, moist summers. The mean annual precipitation is 90 to 120 inches. The mean January temperature is about 38 degrees F.; the mean July temperature is about 63 degrees F. and the mean annual temperature is 47 to 50 degrees F. The frost-free season is 180 to 220 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Halbert, Joecreek, Oyhut and Kydaka soils. Halbert soils have a placic horizon above the dense till. Joecreek soils are shallow to dense till. Oyhut soils are moderately well drained. Kydaka soils are deep to dense till and lack a histic pedon.
DRAINAGE AND PERMEABILITY: Very poorly drained; very slow runoff; moderately slow over very slow permeability.
USE AND VEGETATION: These soils are used for timber production and wildlife habitat. Vegetation is mainly shore pine, Western red cedar and red alder with an understory of labrador tea, salal, bog laurel, marsh marigold, and deer fern.
DISTRIBUTION AND EXTENT: Western Washington; MLRA 4A. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grays Harbor County, Washington; Quinault Indian Reservation; 2007.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Histic horizon from 0 to 8 inches
Densic layer at 29 inches
ADDITIONAL DATA: Reference same from Bg horizon; SOIWA-027-001.