LOCATION VANNOY OREstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Mollic Haploxeralfs
TYPICAL PEDON: Vannoy silt loam, forested. (Colors are for moist soil unless otherwise noted.)
O--0.75 inch to 0; partially decomposed litter of needles, leaves and twigs.
A1--0 to 2 inches; dark brown (7.5YR 4/3) silt loam, pale brown (10YR 6/3) dry; moderate fine granular structure; slightly hard, friable, sticky and slightly plastic; many roots; many irregular pores; 5 percent gravel; slightly acid (pH 6.5); abrupt wavy boundary. (1 to 4 inches thick)
A2--2 to 4 inches; dark brown (7.5YR 4/4) silt loam, pale brown (10YR 6/3) dry; weak medium and moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many roots; many irregular and common very fine tubular pores; 5 percent gravel; slightly acid (pH 6.3); clear smooth boundary. (1 to 4 inches thick)
BA--4 to 11 inches; reddish brown (5YR 4/4) silt loam, light brown (7.5YR 6/4) dry; weak medium and fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common roots; many fine and very fine tubular pores; few thin clay films in pores; 5 percent gravel; strongly acid (pH 5.4); clear smooth boundary. (4 to 7 inches thick)
2Bt1--11 to 19 inches; yellowish red (5YR 4/6) clay loam, yellowish red (5YR 5/6) dry; moderate fine subangular blocky structure; very hard, friable, sticky and plastic; common roots; many very fine tubular pores; common moderately thick clay films on faces of peds; 5 percent weathered gravel; moderately acid (pH 5.6); clear smooth boundary. (4 to 8 inches thick)
2Bt2--19 to 26 inches; yellowish red (5YR 4/6) clay loam, yellowish red (5YR 5/6) dry; moderate fine subangular blocky structure; very hard, firm, sticky and plastic; common roots; many very fine tubular pores; common moderately thick clay films on faces of peds; 12 percent soft rock fragments; moderately acid (pH 6.0); clear smooth boundary. (3 to 7 inches thick)
2Bt3--26 to 35 inches; yellowish red (5YR 4/6) clay loam, yellowish red (5YR 5/6) dry; moderate fine subangular blocky structure; very hard, firm, sticky and plastic; few roots; many very fine tubular pores; common moderately thick red (2.5YR 4/6) clay films on faces of peds and soft rock fragments; 30 percent soft rock fragments; moderately acid (pH 6.0); gradual wavy boundary. (5 to 9 inches thick)
2BCt--35 to 38 inches; yellowish red (5YR 4/6) clay loam, yellowish red (5YR 4/6) dry; massive; very hard, firm, sticky and plastic; few roots; many very fine and fine pores; common moderately thick red (2.5YR 4/6) clay films on gravel; 75 percent soft rock fragments; many black stains; moderately acid (pH 5.9); gradual wavy boundary. (0 to 5 inches thick)
2Crt--38 inches; weathered and highly fractured metamorphosed bedrock; many thick dark red (2.5YR 3/6) clay films and many black stains in fracture planes; moderately acid (pH 6.0).
TYPE LOCATION: Jackson County, Oregon; 1 mile southwest of Jacksonville; about 2,340 feet east and 3,100 feet south of the northwest corner of sec. 31, T. 37 S., R. 2 W., Willamette Meridian.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry for 80 to 110 consecutive days within the four month period following the summer solstice in all parts between depths of 4 and 12 inches and are moist for 90 consecutive days or more in most years in all parts between depths of 4 and 12 inches within the four month period following the winter solstice. The mean annual soil temperature is 48 to 56 degrees F. Depth to the paralithic contact and thickness of the solum range from 20 to 40 inches. Hard rock fragments in the particle-size control section range from 0 to 10 percent; soft rock fragments range from 0 to 35 percent.
The A horizon has hue of 7.5YR or 10YR, value of 3 or 4 moist and 5 through 7 dry, and chroma of 2 through 4 moist and 3 or 4 dry. Rock fragments range from 0 to 15 percent. It has 2 to 4 percent organic matter. It is strongly to slightly acid.
The 2Bt horizon has hue of 7.5YR or 5YR, value of 4 or 5 moist, 5 or 6 dry, and chroma of 4 through 6 moist or dry. It is clay loam with 27 to 35 percent clay and more than 15 percent coarser than very fine sand. Faces of peds in the upper part of the B horizon are coated with clear sand and silt grains in some pedons. It is moderately or slightly acid.
COMPETING SERIES: These are the Bancas, Bull Trail, Hilt, Mary and Shefflein series. Bancas soils have a mean annual soil temperature of 57 to 59 degrees F and is dry over 100 consecutive days. Bull Trail and Shefflein soils are over 40 inches deep to bedrock. Hilt soils contain over 45 percent sand in the particle-size control section and have less than 1 percent organic matter in the surface 7 inches. Mary soils have a lithic contact at 20 to 40 inches.
GEOGRAPHIC SETTING: Vannoy soils are on hillslopes and mountain slopes at elevations of 1,000 to 4,000 feet. Slopes range from 2 to 60 percent. The soils formed in moderately fine textured colluvium weathered from altered sedimentary and extrusive igneous rocks. The climate consists of warm dry summers and cool moist winters. The mean annual precipitation is 20 to 40 inches. The mean annual temperature is 46 to 54 degrees F. The frost-free period is 100 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Caris, Manita, McMullin, Offenbacher, Ruch, and Voorhies series. Caris soils are skeletal and lack an argillic horizon. Manita soils are deep and have a fine textured argillic horizon. McMullin soils are shallow to bedrock. Offenbacher soils lack an argillic horizon. Ruch soils are deep to bedrock. Voorhies soils are skeletal.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderately slow permeability.
USE AND VEGETATION: This soil is used for timber production, wildlife habitat, water supply, and grazing. The native vegetation is mainly Douglas fir, California black oak, ponderosa pine, Pacific madrone, poison oak, creambush oceanspray, common snowberry, California fescue and Idaho fescue.
DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Josephine County, Oregon, 1979.
REMARKS: The activity class was added to the classification in March of 2003. Competing series were not checked at that time. - ET
ADDITIONAL DATA: Characterization data on two profiles (S69 Oreg. 15-1 and 15-5) reported on Riverside Soil Survey Laboratory computer printout.