LOCATION CATLA WAEstablished Series
TAXONOMIC CLASS: Loamy, isotic, mesic, shallow Oxyaquic Vitrandic Haploxerepts
TYPICAL PEDON: Catla gravelly ashy sandy loam - forested. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, and twigs.
Oe--1 to 2 inches; moderately decomposed needles, leaves, and twigs.
A--2 to 5 inches; brown (10YR 5/3) gravelly ashy sandy loam, light gray (10YR 7/2) dry; common medium distinct strong brown (7.5YR 5/6) redox concentrations, reddish yellow (7.5YR 7/6) dry; weak fine and very fine granular structure; soft, very friable, slightly sticky and nonplastic; many fine and very fine and common medium roots; many fine and very fine irregular and tubular pores; 20 percent pebbles; moderately acid (pH 5.8); clear smooth boundary. (2 to 4 inches thick)
Bw--5 to 16 inches; brown (10YR 5/3) gravelly ashy sandy loam, light gray (10YR 7/2) dry; common medium distinct strong brown (7.5YR 5/6) redox concentrations, reddish yellow (7.5YR 7/6) dry; weak fine and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine, and common medium roots; many fine and very fine irregular and tubular pores; 20 percent pebbles; moderately acid (pH 6.0); clear wavy boundary. (7 to 16 inches thick)
Cdl--16 to 37 inches; pale brown (10YR 6/3) dense glacial till that crushes to gravelly sandy loam, light gray (10YR 7/2) dry; common medium distinct strong brown (7.5YR 5/6) redox concentrations, reddish yellow (7.5YR 7/6) dry; massive; extremely hard, very firm, nonsticky and nonplastic; very compact; few very fine roots; few very fine irregular and tubular pores; 30 percent pebbles; moderately acid (pH 6.0); clear smooth boundary. (15 to 30 inches thick)
Cd2--37 to 62 inches; brown (10YR 5/3) dense glacial till that crushes to gravelly sandy loam, light gray (10YR 7/2) dry; massive; extremely hard, very firm, nonsticky and nonplastic; very compact; few fine irregular pores; 30 percent pebbles; neutral (pH 6.8).
TYPE LOCATION: Clallam County, Washington; near pit on Diamond Pt. Road; 2,800 feet north and 600 feet east of the southwest corner of sec. 28, T. 30 N., R. 2 W.
RANGE IN CHARACTERISTICS: Depth to densic material consisting of very compact glacial till is 10 to 20 inches. The mean annual soil temperature is estimated to range from 50 to 53 degrees F. The particle-size control section is 15 to 35 percent rock fragments that are dominantly pebbles and a few cobbles. There is a perched water table at 0.5 to 1.5 feet from January to May (oxyaquic).
The A horizon has value of 5 through 7 dry, 3 through 5 moist, and chromas of 1 to 3. It has granular or subangular blocky structure. This horizon is strongly acid or moderately acid.
The Bw horizon has hue of 10YR or 2.5Y, value of 5 to 7 dry, 4 or 5 moist, and chroma of 2 to 4 moist and dry. It is gravelly ashy loam, gravelly ashy fine sandy loam, or gravelly ashy sandy loam. It has subangular blocky or weak angular blocky structure. This is strongly acid or moderately acid.
The Cd horizon has hue of 10YR, 2.5Y, or 5Y, value of 5 or 6 moist, and chroma of 1 through 3. It is dense glacial till that crushes to gravelly loam or gravelly sandy loam. It is moderately acid to neutral.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Catla soils are on hills and till plains at elevations of 50 to 500 feet. Slopes are 0 to 15 percent. They formed in dense, very compact glacial till or a mantle of ablation till over very compact lodgment till. These soils are in a mild marine climate and have cool, dry summers and cool, moist winters. Average annual precipitation is 18 to 25 inches. Average January temperature is about 38 degrees F, average July temperature is about 60 degrees F., and mean annual temperature is about 49 degrees F. The growing season (28 degrees F.) is 230 to 260 days. Frost-free season is 170 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clallam, Dick, and Hoypus soils. Clallam soils have a dense till at a depth of 20 to 40 inches. Dick soils lack the dense compact till and are sandy. Hoypus soils lack the dense compact till and are sandy-skeletal.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderate permeability to dense glacial till and very slow through the till.
USE AND VEGETATION: Timber production and wildlife are the principal uses. Native vegetation is Douglas-fir, grand fir, western redcedar, western hemlock, Pacific madrone, salal, oceanspray, rhododendron and manzanita.
DISTRIBUTION AND EXTENT: Eastern Clallam County, Washington. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 1979.
REMARKS: Diagnostic horizons and features recognized in this pedon are cambic horizon from 5 to 16 inches, and densic material of dense glacial till at 16 inches.
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.
ADDITIONAL DATA: Partial laboratory data are available. National Soil Survey Laboratory; Sample No. #77WA-9-1.