LOCATION GLENOMA WAEstablished Series
TAXONOMIC CLASS: Ashy-pumiceous, glassy, mesic Humic Vitrixerands
TYPICAL PEDON: Glenoma very paragravelly ashy loam - grass pasture. (colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches; black (10YR 2/1) very paragravelly ashy loam, brown (10YR 4/3) dry; moderate very fine granular structure; soft, very friable, nonsticky, nonplastic, and weakly smeary; many very fine roots; about 45 percent by volume of 2 to 35 mm size volcanic pumice; moderately acid (pH 6.0); clear smooth boundary. (5 to 9 inches thick)
A12--7 to 15 inches; very dark brown (10YR 2/2) very paragravelly ashy loam, dark grayish brown (10YR 4/2) dry; moderate very fine granular structure; soft, very friable, nonsticky slightly plastic, and weakly smeary; many very fine roots; about 40 percent by volume of 2 to 35 mm size volcanic pumice; slightly acid (pH 6.2); clear smooth boundary. (2 to 12 inches thick)
A13--15 to 28 inches; very dark brown (10YR 2/2) very paragravelly ashy loam, dark grayish brown (10YR 4/2) dry; moderate very fine and fine subangular blocky structure; slightly hard, very friable, nonsticky, slightly plastic and weakly smeary; common very fine roots; about 40 percent by volume of 2 to 35 mm size pumice; slightly acid (pH 6.4); abrupt irregular boundary. (4 to 17 inches thick)
B2--28 to 45 inches; dark yellowish brown (10YR 3/4) very paragravelly ashy sandy loam, pale brown (10YR 6/3) dry; weak fine and medium subangular blocky structure; slightly hard, very friable, nonsticky, nonplastic, and weakly smeary; few very fine and common fine roots; about 40 percent by volume of 2 to 35 mm size pumice; neutral (pH 6.6); gradual smooth boundary. (12 to 35 inches thick)
C1--45 to 49 inches; dark yellowish brown (10YR 4/4) extremely paragravelly ashy sandy loam, light yellowish brown (10YR 6/4) dry; massive; soft, very friable, nonsticky, nonplastic, and weakly smeary; few very fine and common fine roots; about 70 percent by volume of 2 to 35 mm in size pumice; neutral (pH 6.6); abrupt wavy boundary. (2 to 10 inches thick)
C2--49 to 60 inches; yellowish brown (10YR 5/8) pumice, yellow (10YR 7/6) dry; single grained; loose; few roots; about 95 percent by volume of 2 to 50 mm size pumice, neutral (pH 6.6)
TYPE LOCATION: Lewis County, Washington; 3 miles southeast of Glenoma; 100 feet south and 100 feet east of the northwest corner of sec. 31, T. 12 N., R. 6 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to more than 60 inches. These soils are dry in the moisture control section for 60 to 75 consecutive days following summer solstice. The mean annual soil temperature ranges from 47 to 52 degrees F. The particle-size control section contains 35 to 65 percent by volume of 2 to 50 mm size pumice and the fine earth fraction is loam, silt loam, or sandy loam. Soil reaction ranges from moderately acid to neutral and hue is 10YR or 7.5YR. It is assumed that the 15 bar water retention is less than 20 percent between depths of 25 to 100 cm and that the base saturation is less than 50 percent between depths of 25 to 75 cm.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 through 3 moist or dry.
The B horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 3 or 4 dry. It is typically very paragravelly ashy loam but ranges to ashy sandy loam or ashy silt loam in both paragravelly and very paragravelly phases.
The C horizon ranges from extremely paragravelly ashy loam to 100 percent pumiceous cinders.
COMPETING SERIES: This is the Cispus series. Cispus soils lack a cambic horizon.
GEOGRAPHIC SETTING: These soils are on alluvial fans and old stream terraces at elevations from 500 to 1000 feet. The slopes range from 0 to 8 percent. The soils formed in alluvium from volcanic pumice and ash. They are in a marine-type climate having cool dry summers and mild wet winters. Mean annual precipitation is 50 to 60 inches. The mean January temperature is 35 degrees F., the mean July temperature is 64 degrees F., and the mean annual temperature is 50 degrees F. The frost- free season is 125 to 175 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cinebar, Galvin, and Klaber soils and the competing Cispus soils. Cinebar soils are medial. Galvin and Klaber soils have an argillic horizon. Also, Galvin soils are somewhat poorly drained and Klaber soils are poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately rapid permeability in the A horizon, rapid in the B horizon, and very rapid in the C horizon.
USE AND VEGETATION: The soils are used for pasture and forage crops. Native vegetation is Douglas-fir and western hemlock with an understory of vine maple, salal, swordfern, and brackenfern.
DISTRIBUTION AND EXTENT: Eastern Lewis County, Washington; MLRA 2. The soil is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lewis County, Washington, 1941.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy.