LOCATION KEEL OREstablished Series
TAXONOMIC CLASS: Medial, amorphic Typic Haplocryands
TYPICAL PEDON: Keel gravelly silt loam, logged. (Colors are for moist soil unless otherwise noted.)
A1--0 to 5 inches; very dark brown (10YR 2/2) gravelly silt loam, grayish brown (10YR 5/2) dry; moderate fine and very fine granular structure; soft, friable, nonsticky and nonplastic; many fine roots; many fine and very fine irregular pores; 10 percent concretions and fine gravel and 5 percent cobbles; strongly acid (pH 5.2); clear smooth boundary.
A2--5 to 10 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure parting to moderate fine subangular blocky and granular; many fine roots; many very fine irregular pores; 5 percent cobbles; strongly acid (pH 5.2); clear smooth boundary. (Combined thickness of A horizon is 7 to 14 inches)
AB--10 to 15 inches; dark brown (10YR 3/3) silt loam, pale brown (10YR 6/3) dry; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common fine roots; many very fine irregular and tubular pores; 5 percent cobbles; strongly acid (pH 5.2); clear smooth boundary. (4 to 8 inches thick)
Bw--15 to 19 inches; brown (10YR 4/3) clay loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; common fine roots; many very fine irregular and tubular pores; 5 percent gravel and 5 percent cobbles; strongly acid (pH 5.1); gradual wavy boundary. (4 to 10 inches thick)
BC--19 to 24 inches; brown (10YR 4/3) cobbly loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; common fine irregular and tubular pores; 10 percent gravel and 20 percent cobbles; very strongly acid (pH 4.9); abrupt irregular boundary. (0 to 12 inches thick)
R--24 inches; fractured partially weathered interlayered breccias and andesite with tongues from above horizon.
TYPE LOCATION: Linn County, Oregon; west of Lost Dog Rock; southeast 1/4 southwest 1/4, sec. 17, T. 12 S., R. 2 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 43 to 47 degrees F, and the mean summer soil temperature is less than 47 degrees F. The soil is usually moist but it is dry between depths of 8 and 24 inches for less than 45 consecutive days during the summer. Depth to bedrock is 20 to 40 inches. The umbric epipedon is 10 to 20 inches thick. The particle-size control section has a phosphate retention of 90 to 100 percent, acid oxalate extractable aluminum plus on-half iron of 2.0 to 4.0 percent, and 15-bar moisture of 20 to 30 percent based on an air-dried sample. The soil is moderately acid through very strongly acid.
The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist, 3 to 5 dry and chroma of 2 or 3 moist and dry. It is cobbly clay loam or gravelly silt loam, and has 5 to 20 percent gravel and 0 to 20 percent cobbles. It has moderate fine or very fine granular or subangular blocky structure. It has a bulk density of 0.40 to 0.85 g/cubic centimeter.
The Bw horizon has hue of 10YR or 7.5YR, value of 3 to 5 moist, 4 to 6 dry, and chroma of 2 to 4 moist and dry. It is gravelly loam, cobbly loam, or clay loam. It has 18 to 32 percent clay, 5 to 20 percent gravel, and 5 to 20 percent cobbles. It has weak to moderate, medium to very fine subangular blocky structure.
COMPETING SERIES: These are the Cruiser, Oneonta, and Soosap series. Cruiser soils are 40 to more than 60 inches to bedrock and have an ochric epipedon. Oneonta soils are 40 to more than 60 inches to bedrock and average less than 18 percent clay in the particle-size control section. Soosap soils are 20 to 40 inches to a paralithic contact over a lithic contact.
GEOGRAPHIC SETTING: Keel soils are in mountains at elevations of 2,700 to 4,800 feet in the Cascade Range. Slopes are 2 to 75 percent. The soils formed in medium and moderately fine textured colluvium and residuum weathered from basic igneous rock and mixed with volcanic ash. The climate is characterized by cold wet winters and cool moist summers. The mean January temperature is 31 degrees F. and the mean July temperature is 50 degrees F. The mean annual temperature is 41 to 45 degrees F. The mean annual precipitation is 65 to 100 inches. The frost-free period is 50 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bensley, Crabtree, Henline, Holderman, and Hummington soils, and the competing Cruiser soils. Bensley, Crabtree, and Holderman soils are skeletal and have an ochric epipedon. Henline and Hummington soils are skeletal.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: This soils is used mainly for timber production. Vegetation is western hemlock, Douglas fir, noble fir, Pacific silver fir, Pacific rhododendron, big huckleberry, common beargrass, and western swordfern.
DISTRIBUTION AND EXTENT: Central part of western Cascade Range, Oregon; MLRA 3. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lane County Area, Oregon, 1981.
REMARKS: This draft reflects a change in classification from Medial Dystric Cryandepts based on the Andisol Order.
Diagnostic horizons and features recognized in this pedon:
Umbric epipedon - from 0 to 15 inches (A1, A2, and AB horizons)
Cambic horizon - from 15 to 24 inches (Bw and BC horizons)
Particle-size control section - from 0 to 24 inches (A1, A2, AB, Bw, and BC horizons)
ADDITIONAL DATA: Characterization data for two profiles S72OR-22-1(1-5) reported on an unpublished form by the Oregon State University and S75OR-39-12(1-6) from SCS Lincoln Laboratory.