LOCATION QUILLAYUTE WA+OREstablished Series
TAXONOMIC CLASS: Medial, ferrihydritic, isomesic Pachic Melanudands
TYPICAL PEDON: Quillayute silt loam, forested. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
01--1 inch to 0; needles, leaves, and twigs.
A11--0 to 8 inches; very dark brown (10YR 2/2) silt loam, dark grayish brown (10YR 4/2) dry; moderate fine and very fine subangular blocky structure parting to granular; slightly hard, friable, sticky, plastic and weakly smeary; many fine, very fine and medium roots; many fine and very fine tubular and irregular pores; very strongly acid (pH 4.8); clear smooth boundary. (7 to 10 inches thick)
A12--8 to 20 inches; very dark grayish brown (10YR 3/2) silt loam, dark brown (10YR 4/3) dry; moderate fine, very fine and medium angular blocky structure; slightly hard, friable, sticky, plastic and weakly smeary; many fine, very fine and medium roots; many fine and very fine tubular and irregular pores; very strongly acid (pH 4.8); clear smooth boundary. (10 to 14 inches thick)
A13--20 to 32 inches; very dark grayish brown (10YR 3/2) and very dark gray (10YR 3/1) silty clay loam, dark brown (10YR 4/3) and dark grayish brown (10YR 4/2) dry; moderate fine, very fine and medium angular blocky structure; slightly hard, friable, sticky, plastic and weakly smeary; many fine and very fine tubular and irregular pores; very strongly acid (pH 5.0); clear irregular boundary. (6 to 13 inches thick)
B2--32 to 49 inches; yellowish brown (10YR 5/4) silty clay loam, very pale brown (10YR 7/4) dry; moderate very fine, fine and medium angular blocky structure; slightly hard, friable, sticky, plastic and weakly smeary; common fine and very fine tubular and irregular pores; very strongly acid (pH 5.0); clear smooth boundary. (17 to 25 inches thick)
B3--49 to 60 inches; light olive brown (2.5Y 5/4) silty clay loam, pale yellow (2.5Y 7/4) dry; weak fine and medium angular blocky structure; slightly hard, friable, sticky, plastic and weakly smeary; few fine and very fine roots; many fine and very fine tubular and many very fine irregular pores; strongly acid (pH 5.2).
TYPE LOCATION: Clallam County, Washington; 500 feet north and 400 feet west of the SE corner of section 14, T.28N., R.15 W.
RANGE IN CHARACTERISTICS: The umbric epipedon is 24 to 35 inches thick. The mean annual soil temperature is estimated to range from 52 to 54 degrees F. The control section has less than 5 percent base saturation. It has 3 to 8 percent organic carbon at a depth of 40 inches.
The A horizon has value of 3 through 5 dry, and chroma of 1 through 3.
The B horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 4 through 6. It is silt loam or silty clay loam. This horizon has subangular blocky or angular blocky structure. It is strongly acid or very strongly acid.
COMPETING SERIES: These are the Bear Prairie, Calawah, Cinebar, LeBar, Lint, Mossyrock, Neskowin, Newaukum, Salander, and Winema series. Bear Prairie soils have weak structure in the B2 horizon, more than 5 percent base saturation in some part of the control section and 0.5 to 3 percent organic carbon at a depth of 40 inches. Cinebar soils have an umbric epipedon 10 to 18 inches thick and fine concretions in the upper part of the control section. Lint soils have an umbric epipedon 10 to 20 inches thick. Mossyrock soils have a xeric moisture regime, prismatic B2 horizon and are slightly acid or neutral in the control section. Neskowin soils have a lithic contact at 20 to 40 inches. Newaukum soils have a xeric moisture regime, and an umbric epipedon 10 to 20 inches thick and 15 to 30 percent hard rock fragments in the control section. Salander soils have a hue of 5YR or 7.5YR in the control section. Winema soils have more than 40 percent measured clay in the control section.
GEOGRAPHIC SETTING: Quillayute soils are on river terraces at elevations of 80 to 350 feet. They formed in loess and old estuary deposits. The soils are in mild marine climate and have cool, moist summers and cool, wet winters. The mean annual precipitation is 85 to 120 inches. The average January temperature is about 39 degrees F.; the average July temperature is about 61 degrees F.; and the mean annual temperature is about 51 degrees F. The frost free season is 160 to 190 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Queets, Solduc, and Wellman soils. Queets soils lack an umbric epipedon and have a bulk density of more than 0.85. Solduc soils are medial, skeletal and somewhat excessively drained. Wellman soils are medial over sandy or sandy, skeletal.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Timber production and pasture are the principal uses. Homesites are being developed in some areas. Native vegetation is western hemlock, Sitka spruce and red alder. Understory species include red huckleberry, salmonberry, salal, western swordfern, deer fern, lady fern, and Oregon oxalis. Vegetation is primarily grasses and western brachenfern in prairie openings.
DISTRIBUTION AND EXTENT: Western Clallam County, Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 1943.
ADDITIONAL DATA: Pedon number S58WA5-1 (1-8); Riverside Soils Laboratory numbers 58151-58158.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy. The color value of the 8 to 20 inch layer needs to be checked in the field.