LOCATION CRUISER OREstablished Series
TAXONOMIC CLASS: Medial, amorphic Typic Haplocryands
TYPICAL PEDON: Cruiser gravelly loam, brush, logged. (Colors are for moist soil unless otherwise noted.)
Oi--1 inch to 0; partially decomposed litter of needles, leaves and twigs.
A--0 to 7 inches; dark brown (10YR 3/3) gravelly loam, brown (10YR 5/3) dry; moderate fine granular and moderate fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine irregular pores; 20 percent fine gravel and concretions; very strongly acid (pH 5.0); clear wavy boundary. (4 to 9 inches thick)
AB--7 to 14 inches; dark reddish brown (5YR 3/4) gravelly loam, reddish brown (5YR 5/3) dry; moderate fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many fine roots; many very fine pores; 25 percent fine gravel and concretions; very strongly acid (pH 5.0); clear wavy boundary. (0 to 10 inches thick)
Bw1--14 to 20 inches; reddish brown (5YR 4/4) gravelly heavy loam, light reddish brown (5YR 6/3) dry; moderate fine subangular blocky structure; slightly hard, friable, sticky and slightly plastic; common fine roots; common very fine pores; 25 percent gravel and concretions; very strongly acid (pH 4.8); clear wavy boundary.
Bw2--20 to 30 inches; reddish brown (5YR 4/4) gravelly clay loam, light reddish brown (5YR 6/3) dry; moderate fine subangular blocky structure; slightly hard, friable, sticky and plastic; few fine roots; common very fine pores; 30 percent fine gravel and concretions; very strongly acid (pH 4.8); gradual smooth boundary.
Bw3--31 to 45 inches; yellowish red (5YR 4/6) gravelly clay loam, light reddish brown (5YR 6/4) dry; moderate medium and fine subangular blocky structure; hard, firm, sticky and plastic; few roots; common very fine pores; 30 percent gravel; very strongly acid (pH 4.8); clear smooth boundary. (Combined thickness of the Bw horizon is 30 to 41 inches)
C--45 to 60 inches; yellowish red (5YR 4/6) very cobbly clay loam, light reddish brown (5YR 6/4) dry; massive; slightly hard, firm, sticky and plastic; few fine pores; 20 percent gravel and 25 percent cobbles; very strongly acid (pH 4.8).
TYPE LOCATION: Linn County, Oregon; 2.5 miles east of Indian Prairie Lake in northeast 1/4 northwest 1/4, sec. 2, T. 11 S., R. 2 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 43 to 47 degrees F, and the mean summer soil temperature is less than 47 degrees F, with an O horizon. The soils are usually moist and dry for less than 45 consecutive days during the summer between depths of 4 and 12 inches. Depth to bedrock ranges from 40 to 60 inches or more. Rock fragments range from 10 to 30 percent in the control section. Gravel and concretions typically make up the majority of the rock fragments in the upper part of the solum and gravel and cobbles in the lower part. The particle-size control section has an estimated phosphate retention of more than 85 percent and acid oxalate extractable aluminum plus one-half iron of more than 2.0 percent. It has sodium fluoride pH of 9.5 to 10.5, and 15-bar moisture of 20 to 30 percent based on an air-dried sample. Reaction ranges from moderately to very strongly acid. Percent clay averages 20 to 30 percent within the control section. Moist bulk density is 0.75 to 0.85 grams per cubic centimeter.
The A horizon has hue of 10YR to 5YR, value of 2 or 3 moist, 4 or 5 dry, and chroma of 3 or 4 moist and dry. Depth to a moist chroma greater than 3.5 is less than 10 inches. It is gravelly loam or gravelly clay loam. This horizon has moderate fine granular or subangular blocky structure.
The Bw horizon has hue of 5YR or 7.5YR, value of 3 or 4 moist, 5 or 6 dry, and chroma of 3 to 6 moist and dry. It is gravelly loam, gravelly clay loam, or loam. It has moderate or weak very fine to medium subangular blocky structure.
The C horizon has hue of 7.5YR or 5YR, and chroma of 4 to 6 moist and dry. It is very cobbly clay loam, cobbly loam, or gravelly loam with some pedons having sandy loam in some parts. Rock fragments range from 15 to 30 percent gravel and 20 to 35 percent cobbles.
COMPETING SERIES: These are the Keel, Oneonta, and Soosap series. Keel and Oneonta soils have umbric epipedons. Soosap soils are 20 to 40 inches to a paralithic contact over a lithic contact and average less than 18 percent clay in the control section.
GEOGRAPHIC SETTING: The Cruiser soils are on uplands with slopes of 2 to 70 percent. Elevations range from 2,200 to 4,700 feet. The soils formed in medium and moderately fine textured colluvial material weathered from basic igneous rock with some additions of volcanic ash at least in the surface. The climate is characterized by cold wet winters and cool moist summers. The mean annual temperature is 41 to 45 degrees F; mean July temperature of 55 degrees F; mean January temperature of 31 degrees F. The mean annual precipitation is 70 to 140 inches. The frost-free period is 70 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Henline and Hummington soils and the competing Keel soils. Henline and Hummington soils are 20 to 40 inches deep to bedrock and have more than 35 percent rock fragments in their control section.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used mainly for timber production, wildlife habitat, and recreation. The vegetation is mountain hemlock, Douglas fir, noble fir, Pacific silver fir, Pacific rhododendron, tall blue huckleberry, common beargrass and western swordfern.
DISTRIBUTION AND EXTENT: Central part of the western Oregon Cascade Mountains and the central part of the Oregon Coast Range;MLRA 3, 1. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Polk County, Oregon, 1977.
REMARKS: This draft reflects a change in classification from Medial Andic Cryochrepts based on the Andisol Order.
Diagnostic horizons and features recognized in this pedon:
Ochric epipedon - from 0 to 14 inches (A and AB horizon)
Cambic horizon - from 14 to 45 inches (Bw1, Bw2, and Bw3 horizons)
Particle-size control section - from 0 to 40 inches (A, AB, Bw1, and Bw2 horizons and upper 9 inches of the Bw3 horizon)
ADDITIONAL DATA: Laboratory data available for reference sample S75OR-39-13 (75417) from Lane County, Oregon; Riverside, CA Laboratory, 5/77.