LOCATION TILLICUM WAEstablished Series
TAXONOMIC CLASS: Ashy over loamy, glassy over isotic, frigid Typic Vitrixerands
TYPICAL PEDON: Tillicum fine sandy loam-under coniferous forest on a 40 percent north-facing backslope at an elevation of 4,500 feet. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures).
0e--2 inches to 0; decomposing forest litter.
A--0 to 8 inches; light brownish gray (l0YR 6/2) fine sandy loam, dark brown (l0YR 4/3) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many fine and medium roots; many fine tubular pores; trace of pumice; slightly acid (pH 6.3); NaF pH l0.0; gradual wavy boundary. (3 to 9 inches thick)
Bw--8 to l6 inches; light brownish gray (l0YR 6/2) fine sandy loam, dark yellowish brown (l0YR 4/4) moist; weak fine granular structure; soft, friable, nonsticky and nonplastic; common medium and coarse roots; many fine tubular pores; trace of pumice; slightly acid (pH 6.5); NaF pH l0.3; gradual wavy boundary. (5 to l0 inches thick)
BC--l6 to 24 inches; pale brown (l0YR 6/3) fine sandy loam, dark brown (l0YR 4/3) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few fine and medium roots; common fine and medium tubular pores; 5 percent pebbles and trace of pumice; slightly acid (pH 6.5); NaF pH l0.3; clear wavy boundary. (7 to ll inches thick)
2C--24 to 42 inches; pale brown (l0YR 6/3) cobbly sandy loam, dark grayish brown (l0YR 4/2) moist; massive, hard, friable, slightly sticky and nonplastic; few fine and medium roots; common fine and medium tubular pores; l0 percent pebbles, l5 percent cobbles, 5 percent stones and 30 percent weathered rock fragments; a stone line rests at the upper boundary of this horizon; neutral (pH 7.0); NaF pH 9.2; clear wavy boundary. (l5 to 30 inches thick)
2R--42 inches; schist.
TYPE LOCATION: Chelan County, Washington; about 6 miles southwest of Ardenvoir on Dinkelman Ridge Road No. 2529, about 2 miles northeast of junction with Road 2723; 2,200 feet west and l,200 feet south of the northeast corner of sec. 29, T. 25 N., R. 20 E.
RANGE IN CHARACTERISTICS: These soils are usually moist, but are dry from 60 to 75 consecutive days following summer solstice. Depth to the 2C horizon ranges from l5 to 30 inches. Depth to bedrock ranges from 40 to 60 inches. The upper 15 to 30 inches of the 0 to 40 inch particle-size control section has an estimated moist bulk density of 0.65 to 1.0 g/cc, volcanic glass content of 30 to 60 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 1.0 to 2.0 percent and 15-bar water retention of 5 to 12 percent for air dried samples. The lower part of the control section averages l5 to 35 percent rock fragments and l0 to 40 percent weathered schist or gneiss fragments. Some pedons have a thin E horizon.
The A horizon has value of 5 through 7 dry, 3 through 5 moist, and chroma of l through 3 dry and moist. Reaction ranges from strongly acid to slightly acid.
The B horizon has hue of l0YR or 7.5YR, value of 5 through 7 dry, 3 through 5 moist, and chroma of 2 through 4 dry and moist. It is fine sandy loam, sandy loam or gravelly sandy loam. Reaction is moderately acid to neutral.
The 2C horizon has hue of l0YR or 2.5Y, value of 5 through 7 dry, 3 through 5 moist, and chroma of 2 through 4 dry and moist. It is cobbly sandy loam, stony sandy loam, or gravelly sandy loam. Cobble and stone lines are at the boundary between the B and 2C horizons in some pedons. Reaction is slightly acid or neutral.
COMPETING SERIES: This is the Eloika series. Eloika soils are dry for 45 to 60 consecutive days and are silt loam or loam in the B horizon.
GEOGRAPHIC SETTING: Tillicum soils are on mountainsides with generally a northerly aspect at elevations of 1,400 to 4,800 feet. Slopes are 8 to 90 percent. These soils formed in volcanic ash over residuum and colluvium from gneiss or schist. They are in a climate with warm dry summers and cool moist winters. The average annual precipitation is 35 to 55 inches. The average January temperature is about 22 degrees F.; the average July temperature is about 63 degrees F.; the average annual temperature is 4l to 43 degrees F. The frost-free season is 70 to ll0 days. The growing season, at 28 degrees F.
i. about l20 to l50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ardenmont, Ardenvoir, Chumstick, Kloochman, Saska, and Surgh series. Ardenmont and Ardenvoir soils lack volcanic ash influence in the control section. Chumstick and Kloochman soils have bedrock at depths of 20 to 40 inches. Saska soils have a spodic horizon and are ashy over loamy-skeletal. Surgh soils are cryic.
DRAINAGE AND PERMEABILITY: Well drained, slow to rapid runoff, moderate permeability in the subsoil and moderately rapid permeability in the substratum.
USE AND VEGETATION: Woodland, wildlife habitat, watershed, and recreation. Native vegetation is Douglas-fir, ponderosa pine, grand fir, lodgepole pine and Engelmann spruce with an understory of lupine, common princes pine and Cascade Oregon-grape.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in East Central Chelan County, Washington. Series is small in extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Chelan County (Entiat Area), Washington, l97l.
REMARKS: Diagnostic horizons and features recognized in this pedon are an ochric epipedon from the mineral surface to 8 inches, a cambic horizon from 8 to 24 inches, and a particle-size control section that meets andic soil properties from 0 to 24 inches, and is loamy from 24 to 40 inches. This description reflects a change in classification due to Andisols order from medial over loamy, mixed, frigid Andic Xerochrepts to ashy over loamy, mixed, frigid Typic Vitrixerands.
ADDITIONAL DATA: Partial laboratory data are available on this soil. National Soil Survey Lab No. WA 807838.