LOCATION TISCH WAEstablished Series
TAXONOMIC CLASS: Medial, mixed, acid, mesic Typic Endoaquands
TYPICAL PEDON: Tisch silt, pasture. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 7 inches, very dark brown (l0YR 2/2) silt, grayish brown (l0YR 5/2) dry; weak, fine and moderate, granular and weak, platy structure; slightly hard, friable, slightly sticky and sightly plastic; many very fine roots; medium acid (pH 6.0); clear, smooth boundary. (6 to ll inches thick)
A3--7 to l2 inches, very dark brown (l0YR 3/2) silt, grayish brown (l0YR 5/2) dry; moderate, medium, subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; medium acid (pH 6.0); abrupt, smooth boundary. (0 to 8 inches thick)
Cl--l2 to l7 inches, very dark grayish brown (l0YR 3/2) silt, light brownish gray (l0YR 6/2) dry; few fine distinct dark brown (7.5YR 4/4) mottles; moderate, coarse, prismatic structure; slightly hard, firm, slightly sticky and slightly plastic; many very fine roots, common fine and very fine pores; organic deposits in fine pores and along root channels; slightly acid (pH 6.2); clear smooth boundary. (5 to 7 inches thick)
C2--l7 to 26 inches, dark grayish brown (l0YR 4/2) silt, light gray (l0YR 7/2) dry; weak, thick platy structure; slightly hard, firm, slightly sticky and slightly plastic; many very fine roots; common very fine and fine pores; organic deposits in pores and along root channels; slightly acid (pH 6.4); abrupt, broken boundary. (0 to l0 inches thick)
C3--26 to 28 inches, dark yellowish brown (l0YR 4/3) silt (pumicite), very pale brown (l0YR 7/3) dry; massive; slightly hard, firm, slightly sticky and slightly plastic; common very fine roots; common very fine and fine pores; organic deposits in pores and along root channels; slightly acid (pH 6.4); abrupt smooth boundary. (0 to 3 inches thick)
C4--28 to 55 inches, very dark brown (l0YR 2/2) silt, grayish brown (l0YR 5/2) dry; massive; slightly hard, firm, slightly sticky and slightly plastic; few very fine roots; common very fine pores; organic deposits in pores and along root channels; slightly acid (pH 6.2); abrupt smooth boundary. (20 to 30 inches thick)
C5--55 to 65 inches, black (l0YR 2/l) and very dark brown (l0YR 2/2) muck, dark grayish brown (l0YR 4/2) dry; finely laminated; hard, friable, slightly sticky and slightly plastic; few very fine pores; medium acid (pH 5.8); clear smooth boundary. (0 to 5 inches thick)
TYPE LOCATION: Pierce County, Washington; 2,070 feet east and l00 feet south of northwest corner sec. 7, T. l7 N., R. 4 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at depth of 20 inches is estimated to range from 49 to 52 degrees F. Reaction ranges from neutral to strongly acid.
The A horizon has hue of l0YR through 5Y, value of 2 or 3 moist, 4 or 5 dry, and chroma of l or 2 moist and dry. It contains as much as 20 percent organic matter.
The C horizon has hue of l0YR, 2.5Y, 5Y or neutral, value of 2 to 7 moist, 4 to 8 dry, and chroma of 0 to 3 moist and dry. It is silt or silt loam. Some pedons lack layers of sapric material.
COMPETING SERIES: These are the Cocolalla and Tulane series. Cocolalla soils have layers of silty clay loam and are neutral to mildly alkaline. Tulane soils are neutral to moderately alkaline in the upper part and neutral to extremely acid in the lower part.
GEOGRAPHIC SETTING: These soils are in upland basins and drainages at elevations ranging from 50 to l,000 feet. Slopes are 0 to 3 percent. The soils formed in material mainly of diatomaceous earth, volcanic ash, and alluvium. Tisch soils are in subhumid to humid climates having cool relatively dry summers and mild moist winters. Mean annual precipitation is 35 to 60 inches. Mean January temperature is 40 degrees F.; mean July temperature is 59 degrees F.; mean annual temperature is 50 degrees F. The frost-free season is about 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bellingham, Dollar, Dupont, Mukilteo, Norma, Semiahmoo, Sifton, Snohomish, and Wapato soils. Bellingham, Dollar, Norma, Sifton, Snohomish, and Wapato soils have mix mineralogy. Dupont, Mukilteo, and Semiahmoo soils are Histosols.
DRAINAGE AND PERMEABILITY: Very poorly drained; very slow runoff or ponded; moderately slow permeability.
USE AND VEGETATION: Used primarily for pasture and wildlife habitat. Vegetation on uncleared areas is willow, red alder, western cedar, western hemlock, black hawthorne, spirea, grasses, and sedge.
DISTRIBUTION AND EXTENT: Western Washington and possibly northwestern Oregon. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Pierce County, Washington, l945.
Classification only updated 3/94 because of recent amendments to Soil Taxonomy. Meets criteria for andic soil properties.