LOCATION KENUSKY OREstablished Series
TAXONOMIC CLASS: Fine, isotic, mesic Umbric Paleaquults
TYPICAL PEDON: Kenusky silty clay loam - wooded. (Colors are for moist soil unless otherwise noted).
A--0 to 8 inches; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry; strong very fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine and fine roots; many fine irregular pores; very strongly acid; abrupt smooth boundary. (4 to 10 inches thick)
ABt--8 to 13 inches; black (10YR 2/1) silty clay, very dark gray (10YR 3/1) dry; common fine distinct dark yellowish brown (10YR 4/6) redox accumulations; strong coarse subangular blocky structure; very hard, firm, very sticky and very plastic; common fine and very fine roots; many very fine tubular pores; few faint clay films in pores; very strongly acid; clear smooth boundary. (0 to 10 inches thick)
Bt1--13 to 19 inches; dark gray (10YR 4/1) silty clay, gray (10YR 6/1) dry; common fine distinct dark yellowish brown (10YR 4/6) redox accumulations; strong coarse subangular blocky structure; very hard, firm, very sticky and very plastic; common fine and very fine roots; many very fine tubular pores; few distinct clay films in pores; very strongly acid; clear smooth boundary. (4 to 8 inches thick)
Bt2--19 to 44 inches; dark gray (10YR 4/1) clay, grayish brown (2.5Y 5/2) dry; common fine distinct dark yellowish brown (10YR 4/6) redox accumulations; weak coarse subangular blocky structure; extremely hard, very firm, extremely sticky and extremely plastic; few fine roots; common very fine tubular pores; common distinct clay films on peds and in pores; very strongly acid; clear smooth boundary. (10 to 30 inches thick)
BCt--44 to 60 inches; grayish brown (10YR 5/2) clay, light gray (2.5Y 7/2) dry; few fine distinct dark yellowish brown (10YR 4/6) redox accumulations; massive; extremely hard, very firm, extremely sticky and extremely plastic; few fine tubular pores; few faint and medium dark grayish brown (10YR 4/2) clay films on faces of vertical fractures and few distinct in pores; very strongly acid.
TYPE LOCATION: Columbia County, Oregon; 100 feet east of road in the southeast 1/4 southeast 1/4 southeast 1/4, section 16, T. 5 N., R. 4 W.
RANGE IN CHARACTERISTICS: The soil is saturated with water from November through May and is dry for less than 45 consecutive days between depths of 4 to 12 inches during the summer. The mean annual soil temperature is 49 to 53 degrees F. The umbric epipedon is 10 to 20 inches thick.
The A and ABt horizon has chroma of 1 or 2 moist and dry. Texture is silty clay loam with 30 to 40 percent clay. Reaction is very strongly acid or strongly acid.
The Bt horizon has hue of 10YR moist and 10YR or 2.5Y dry, value of 4 or 5 moist, 4 to 6 dry, and chroma of 1 or 2 moist and dry. It has distinct dark yellowish brown or strong brown redox accumulations. It has 50 to 65 percent clay.
The BCt horizon has value of 5 or 6 moist, 6 or 7 dry and chroma of 1 or 2 moist and dry. It has distinct dark yellowish brown or strong brown redox accumulations. It has 60 to 70 percent clay.
COMPETING SERIES: There are no competing series. The Pyburn series has a similar classification. Pyburn soils have a 20 percent clay decrease from the maximum clay content within 1.5 meters from the soil surface.
GEOGRAPHIC SETTING: Kenusky soils are on terrace remnants in mountainous areas of the Coast Range at elevations of 500 to 1,200 feet. Slopes range from 0 to 15 percent. These soils formed in mixed alluvium under a cool, moist climate. The mean July temperature is 60 to 63 degrees F. and the mean January temperature is 35 to 37 degrees F. The mean annual temperature is 47 to 50 degrees F. The mean annual precipitation is 60 to 75 inches. The frost-free period is 100 to 180 days. The soils are on the Seven Devils geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Glohm, Bacona, Mayger, Trask, and Vernonia soils. Glohm soils are moderately well drained and are 20 to 40 inches deep to a fragipan. Bacona and Vernonia soils are well drained and have a fine-silty argillic horizon. Mayger soils are somewhat poorly drained and are 20 to 40 inches deep to a claypan. Trask soils are well drained, loamy-skeletal, and 20- to 40- inches deep to siltstone or shale.
DRAINAGE AND PERMEABILITY: Poorly drained; slow to moderate runoff; very slow permeability.
USE AND VEGETATION: These soils are used for timber production, recreation, and wildlife habitat. Native vegetation is Douglas-fir, western redcedar, western hemlock, red alder, cascade Oregon-grape, common snowberry, salal, western swordfern and brackenfern.
DISTRIBUTION AND EXTENT: Mountains of the Coast Range in Columbia County, Oregon. MLRA 1. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Columbia County, Oregon, 1983.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon the zone from 0 to 13 inches
Argillic horizon the zone from 13 to 60 inches
Aquults feature - saturation with dominant chroma of 2 or less in the matrix of the argillic horizon and redox concentrations of higher chroma at a depth of 13 inches (Bt1 horizon).
Particle-size control section the zone from 13 to 33 inches
Classification revised 10/03 from Fine, mixed, mesic Typic Umbraquults to Fine, isotic, mesic Umbric Paleaquults.