LOCATION SQUALLY WAEstablished Series
TAXONOMIC CLASS: Medial-skeletal, ferrihydritic, mesic Typic Fulvudands
TYPICAL PEDON: Squally gravelly silty loam - forested. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
0l--l inch to 0; leaves and hemlock needles in various stages of decomposition.
Al--0 to l0 inches; dark brown (7.5YR 3/3) gravelly silt loam, brown (7.5YR 5/4) dry; moderate medium and fine subangular blocky structure; soft very friable, nonsticky, nonplastic and weakly smeary; common fine and very fine roots; common fine and very fine tubular and many very fine interstitial pores; 20 percent pebbles-size basalt fragments; strongly acid (pH 5.4); gradual wavy boundary. (l0 to l4 inches thick)
B2--l0 to 63 inches; dark reddish brown (5YR 3/4) very gravelly fine sandy loam, brownish yellow (l0YR 6/6) dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic and weakly smeary; few fine and very fine roots; many very fine interstitial pores; 55 percent pebble-size basalt fragments; strongly acid (pH 5.4); gradual wavy boundary. (50 to 60 inches thick)
C--63 to 75 inches; brown (l0YR 4/3) extremely gravelly sandy loam, pale brown (l0YR 6/3) dry; weak very fine and fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and very fine roots; common fine and very fine pores; 75 percent basalt pebbles, 5 percent basalt cobbles; medium acid (pH 6.0).
TYPE LOCATION: Wahkiakum County, Washington; on the South Fork Grays River; l700 feet east north of southwest corner, sec. 9, T. l0 N., R. 6 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 47 to 53 degrees F. The l0- to 40-inch control section is extremely gravelly, very gravelly, very cobbly, or extremely cobbly, fine sandy loam or sandy loam that averages 50 to 80 percent rock fragments.
The A horizon has hue of 7.5YR or l0YR, value of 2 or 3 moist, 3 through 5 dry, and chroma of 2 through 4 moist or dry. It has medium and fine granular or subangular blocky structure.
The B horizon has hue of 5YR through l0YR, and value of 3 or 4 moist.
COMPETING SERIES: These are the Aschoff, Hoodview, Katula, and Traham series. Aschoff soils have a very cobbly silty loam or very cobbly loam particle-size control section. Hoodview soil shave an umbric epipedon 20 to 30 inches thick. Katula and Traham soils have a lithic contact at a depth of 20 to 40 inches.
GEOGRAPHIC SETTING: Squally soils formed in landslide deposits on slopes ranging from 5 to 65 percent as elevations from sea level to l800 feet. They occur in a coastal marine climate with mild wet winters and cool dry summers. Mean annual precipitation is 70 to ll0 inches. The mean January temperature is 37 degrees F.; mean July temperature is 60 degrees F.; and the mean annual temperature is 50 degrees F. The growing season (28 degrees F.) is l50 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Astoria, Bunker, Elochoman, Lates, Lytell, Murnen, and Zenker soils. Astoria, Bunker, Elochoman, Lytell, and Zenker soils have a medial particle-size control section. Lates and Murnen soils are frigid and have less than 35 percent rock fragments in the particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; rapid permeability.
USE AND VEGETATION: Squally soils are used primarily for timber production. The native vegetation is Douglas-fir, western hemlock, western redcedar, and red alder with an understory of vine maple, western swordfern, red huckleberry, Oregon-grape, salal, and salmonberry.
DISTRIBUTION AND EXTENT: Southwestern Washington and possibly northwestern Oregon. The soil is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wahkiakum County, Washington, l976.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy.