LOCATION CARLSBORG WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Typic Xerorthents
TYPICAL PEDON: Carlsborg gravelly sandy loam - pasture. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
Ap--0 to 9 inches; dark brown (7.5YR 4/4) gravelly sandy loam, light brown (7.5YR 6/4) dry; weak fine and very fine subangular blocky structure parting to granular; very friable, slightly sticky and nonplastic; many fine and very fine roots; many fine and very fine irregular, and many very fine tubular pores; 30 percent pebbles; slightly acid (pH 6.2); clear smooth boundary. (3 to 9 inches thick)
Bw--9 to 20 inches; dark brown (7.5YR 4/4) very gravelly loamy sand, light brown (7.5YR 6/4) dry; weak fine and very fine subangular blocky structure; very friable, nonsticky and nonplastic; common fine and very fine roots; many fine and very fine irregular, and many fine tubular pores; 40 percent pebbles and 15 percent cobbles; slightly acid (pH 6.2); gradual smooth boundary. (4 to 11 inches thick)
C1--20 to 37 inches; dark yellowish brown (10YR 4/4) extremely gravelly loamy sand, light yellowish brown (10YR 6/4) dry; massive; very friable, nonsticky and nonplastic; common fine and very fine roots; many fine and very fine irregular pores; 45 percent pebbles and 20 percent cobbles; slightly acid (pH 6.2); clear smooth boundary. (17 to 24 inches thick)
C2--37 to 45 inches; yellowish brown (10YR 5/4) extremely cobbly loamy sand, very pale brown (10YR 7/4) dry; single grained; loose, nonsticky and nonplastic; few fine and very fine roots; 45 percent pebbles and 30 percent cobbles; slightly acid (pH 6.2); clear smooth boundary. (8 to 21 inches thick)
C3--45 to 60 inches; yellowish brown (10YR 5/4) extremely gravelly sand, light yellowish brown (10YR 6/4) dry; single grained; loose, nonsticky and nonplastic; few fine and very fine roots; 40 percent pebbles and 20 percent cobbles; slightly acid (pH 6.2).
TYPE LOCATION: Clallam County, Washington; 2,500 feet south and 850 feet east of the NW corner of sec. 19, T. 30 N., R. 3 W.
RANGE IN CHARACTERISTICS: Solum thickness is 10 to 20 inches. Rock fragments in the particle-size control section range from 60 to 85 percent including 15 to 30 percent cobbles. The mean annual soil temperature is 47 to 52 degrees F. The soil is usually moist but is dry for 60 to 75 consecutive days following summer solstice. The soils have less than 5 percent volcanic glass.
The A horizon has hue of 5YR or 7.5YR, value of 2 through 4 moist, 4 through 6 dry and chroma of 2 through 4.
The B horizon has value of 3 or 4 moist, 5 or 6 dry. It is very gravelly loamy sand or very cobbly loamy sand. In noncultivated areas, the upper part of the B horizon is very gravelly sandy loam, or very cobbly sandy loam in some pedons. This horizon has granular or subangular blocky structure.
The C horizon has hue of 10YR or 2.5Y, value of 3 through 6 moist, 5 through 7 dry and chroma of 2 through 4. It is extremely gravelly loamy sand, loamy sand, extremely gravelly sand or cobbly sand. It is slightly acid or neutral.
COMPETING SERIES: These are the Atter, Choop, Hoypus, Lazan, Spens and Valcreek series. Atter soils are dry for over 90 consecutive days and have a mean annual soil temperature of 53 to 59 degrees F. Hoypus soils have 35 to 60 percent gravel and cobbles in the control section and less than 10 percent are cobbles. Hoypus soils also have a thin E horizon that is absent in some pedons. Choop and Lazan soils are shallow to a paralithic contact. Valcreek soils are 20 to 40 inches deep to a paralithic contact. Spens soils lack a B horizon and have a solum that is less than 10 inches thick.
GEOGRAPHIC SETTING: Carlsborg soils are on river terraces and old alluvial fans at elevations of 50 to 500 feet. Slopes are 0 to 30 percent. They formed in coarse textured alluvium. The soils are in a mild marine climate and have cool, dry summers and cool, moist winters. Mean annual precipitation is 15 to 32 inches. Average January temperature is about 38 degrees F., average July temperature is about 60 degrees F., and the mean annual temperature is about 49 degrees F. Frost-free season is 170 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alderwood, Cassolary, Clallam, Dungeness, Everett, Kitsap, Puget, Sequim, Yeary and the competing Hoypus series. Alderwood soils have a cemented layer at 20 to 40 inches. Cassolary soils are fine-loamy. Clallam soils are loamy-skeletal with a densic contact at depths of 20 to 40 inches. Dungeness soils are coarse-silty. Everett soils have a cambic horizon. Kitsap soils are fine-silty. Puget soils are fine silty and poorly drained. Sequim soils have a mollic epipedon. Yeary soils are fine-loamy with a densic contact at depths of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; rapid permeability.
USE AND VEGETATION: Homesites and farming are the principal uses. Native vegetation is Douglas-fir and Pacific madrone. Understory species include Oregon-grape, salal, blackberry, red huckleberry, western brackenfern and various annual and perennial grasses. Principal crops are alfalfa and grass hay, strawberries and pasture.
DISTRIBUTION AND EXTENT: Northwestern Washington. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 1943.
REMARKS: Diagnostic horizons and other features:
The Bw horizon has too coarse of texture to qualify as a cambic horizon.