LOCATION FLANE OR

Established Series
Rev. MHF/CAK/TDT
06/2011

FLANE SERIES

The Flane series consists of deep, well drained soils that formed in colluvium and residuum from tuffaceous sandstone and siltstone and basalt. They are on uplands and have slopes of 3 to 75 percent. The mean annual precipitation is 85 inches and the mean annual temperature is 45 degrees F.

TAXONOMIC CLASS: Clayey-skeletal, isotic, frigid Humic Dystrudepts

TYPICAL PEDON: Flane gravelly loam - forested. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed litter of leaves, fir needles and twigs.

A1--1 to 7 inches; very dark grayish brown (10YR 3/2) gravelly loam, dark grayish brown (10YR 4/2) dry; strong very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine irregular pores; 25 percent fine gravel and concretions; very strongly acid (pH 4.8); clear wavy boundary. (4 to 8 inches thick)

A2--7 to 14 inches; dark yellowish brown (10YR 3/4) gravelly loam, brown (10YR 5/3) dry; moderate very fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine irregular pores; 20 percent gravel, 10 percent cobbles; very strongly acid (pH 4.8); clear wavy boundary. (5 to 9 inches thick)

Bw1--14 to 23 inches; brown (10YR 4/3) very cobbly silty clay loam, pale brown (10YR 6/3) dry; moderate fine subangular blocky structure; hard, firm, very sticky and very plastic; common fine roots; many very fine tubular pores; 25 percent gravel, 25 percent cobbles and 5 percent stones; very strongly acid (pH 4.8); clear wavy boundary. (6 to 12 inches thick)

Bw2--23 to 38 inches; yellowish brown (10YR 5/4) very cobbly silty clay loam, pale brown (10YR 6/3) dry; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine roots; common very fine tubular pores; 20 percent gravel, 30 percent cobbles and 5 percent stones; very strongly acid (pH 4.8); abrupt wavy boundary. (12 to 18 inches thick)

2C--38 to 61 inches; dark grayish brown (2.5Y 4/2) extremely cobbly clay loam, light brownish gray (2.5Y 6/2) dry; common medium yellowish brown (10YR 5/8) variegations; massive; hard, firm, moderately sticky and moderately plastic; few fine roots; few very fine tubular pores; 25 percent gravel, 35 percent cobbles and 5 percent stones; very strongly acid (pH 4.8).

TYPE LOCATION: Linn County, Oregon; about 1.5 miles northwest of Swamp Mountain; in southeast 1/4 southeast 1/4 sec. 20, T. 14 S., R. 3 E.

RANGE IN CHARACTERISTICS: These soils are usually moist and are dry for less than 45 consecutive days between depths of 4 and 12 inches during the 4-month period following the summer solstice. The mean annual soil temperature is 42 to 47 degrees F. The solum is 40 to 60 inches and more thick.

The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 to 4 moist or dry. It has 15 to 30 percent rock fragments.

The Bw horizon has hue of 10YR or 7.5YR, value of 4 or 5 moist, 5 or 6 dry, and chroma of 3 to 4 moist or dry. It is very cobbly silty clay loam, or very cobbly silty clay with 35 to 45 percent clay and has 35 to 60 percent rock fragments.

The 2C horizon when present is very cobbly or extremely cobbly clay loam with 27 to 35 percent clay.

COMPETING SERIES: These are the Dobbins and Ritner series in other families. Dobbins soils have mesic soil temperature and have a lithic contact at 20 to 40 inches. Ritner soils have a xeric moisture regime, a mesic soil temperature regime, and are 20 to 40 inches deep to bedrock.

GEOGRAPHIC SETTING: Flane soils are on broad ridges and sideslopes on uplands. Slopes are 3 to 75 percent. Elevations are 2,800 to 3,600 feet. The soils formed in colluvium and residuum from tuffaceous sandstone and siltstone and basalt. The soils have a humid climate with cool, wet winters and warm, dry summers. The mean annual precipitation is 70 to 90 inches, which occurs as rain in the spring and autumn and as rain and snow in the winter. The mean January temperature is 35 degrees F, mean July temperature is 62 degrees F, and the mean annual temperature is 43 to 45 degrees F. The frost-free period is 90 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Moe soils. Moe soils have an umbric epipedon over 10 inches thick and are medial.

DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.

USE AND VEGETATION: These soils are used mainly for timber production, wildlife habitat and recreation. The tree canopy is dominantly Douglas-fir, western hemlock and western redcedar. The understory is Pacific rhododendron, salal, vine maple, cascade Oregon-grape and tall blue and red huckleberry.

DISTRIBUTION AND EXTENT: Central part of the Western Cascades, Oregon; MLRA 3. The series is inextensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Linn County, Oregon, 1983.

REMARKS: Diagnostic horizons and other features:

Ochric epipedon
Humic subgroup - color requirement is met from 1 to 14 inches
Cambic horizon - from 14 to 38 inches

National Cooperative Soil Survey
U.S.A.