LOCATION SKINNER OREstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, mesic Typic Dystrudepts
TYPICAL PEDON: Skinner gravelly ashy clay loam - forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed litter from salal and hemlock.
A--1 to 6 inches; mixed very dark brown and black (10YR 2/2, 2/1) gravelly ashy clay loam, very dark grayish brown (10YR 3/2) dry; strong very fine granular structure, soft, friable, slightly sticky and slightly plastic; many roots, many very fine irregular pores; 20 percent gravel and cobbles; very strongly acid (pH 4.6); clear smooth boundary. (4 to 7 inches thick)
BA--6 to 14 inches; dark brown (7.5YR 3/4) gravelly ashy clay loam, brown (7.5YR 5/4) dry; moderate very fine granular structure; soft, friable, slightly sticky and slightly plastic; many roots; many very fine tubular pores; 20 percent gravel and cobbles; extremely acid ((pH 4.4); gradual smooth boundary. (6 to 10 inches thick)
Bw1--14 to 23 inches; brown (7.5YR 4/4) gravelly clay loam, yellowish brown (10YR 5/4) dry; weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many roots; common very fine tubular pores; 20 percent gravel and cobbles; extremely acid (pH 4.4); gradual smooth boundary. (7 to 10 inches thick)
Bw2--23 to 30 inches; brown (10YR 4/3) cobbly clay loam, yellowish brown (10YR 5/4) dry; weak very fine subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; 25 percent gravel and cobbles; common roots; common very fine tubular pores; extremely acid (pH 4.4); gradual smooth boundary. (6 to 10 inches thick)
BCt--30 to 46 inches; dark yellowish brown (10YR 4/4) very cobbly clay, yellowish brown (10YR 5/4) dry; massive; firm, moderately sticky and moderately plastic; few faint clay films in pores; 50 percent cobbles and gravel; few roots; common very fine tubular pores; very strongly acid; abrupt irregular boundary. (15 to 25 inches thick)
R--46 inches; basalt bedrock.
TYPE LOCATION: Lincoln County, Oregon, about 5 miles southeast of Waldport; near north road cut at the rounded corner of the USFS road in the southwest corner northwest 1/4 northwest 1/4 northeast 1/4, sec. 9, T.14S., R. 11W.
RANGE IN CHARACTERISTICS: The mean soil temperature ranges from 49 to 53 degrees F. The soils are usually moist and are dry for less than 45 consecutive days during the summer. The solum ranges from 24 to 40 inches thick and depth to bedrock ranges from 40 to 60 inches. Depth to the clayey BCt horizon ranges from 25 to 40 inches but is commonly 30 inches or more. Rock fragments range from 15 to 25 percent in the A horizons and up to 35 percent in the Bw horizons, and in the BCt horizons the amount is commonly more than 35 percent, ranging up to 65 percent below depth of 40 inches. The 10 to 40 inch control section averages less than 35 percent.
The A horizon has hue of 10YR or 7.5YR, value closest to the 2 in the upper part and 2 or 3 in the lower part or BA horizon, and chroma of 1 to 3 in the A and closest to 4 in the BA horizon. It has strong very fine or fine granular grading to very fine subangular blocky or granular in the BA horizon.
The Bw horizon has hue of 10YR or 7.5YR, value closest to 4 moist and 5 or 6 dry and chroma of 4 to 6 moist and dry. It is gravelly or cobbly clay loam. It commonly has weak very fine to medium subangular blocky structure.
The C horizon where present and BC horizons are clay loam or clay and are massive or have very weak subangular blocky structure.
COMPETING SERIES: These are the Hembre, McTaggard, Muskingum, Sadie and Sund series. Hembre soils have umbric epipedons and have hue of 5YR or 2.5YR in the B horizon. Muskingum soils have a lithic contact at depths of 20 to 40 inches. Sadie soils are 20 to 40 inches deep to very hard, very firm and brittle basal till. Sund soils are 20 to 40 inches deep to a paralithic contact over greenstone bedrock.
GEOGRAPHIC SETTING: The Skinner soils are on smooth or dissected smooth steep slopes in mountainous topography at elevations of 300 to 1,800 feet; slope gradients range from 25 to 75 percent. The soils formed in moderately fine textured colluvium over very cobbly or stony clayey residuum or colluvium weathered from volcanic basalt. The rock occurs usually as breccia with numerous thin beds of tuffaceous siltstone between flows. The climate is marine-like in character with an annual precipitation of 60 to 100 inches and with a short dry season during the summer. The mean annual temperature is 47 to 51 degrees F; the average January temperature is 40 to 44 degrees F; and the average July temperature is 55 to 58 degrees F. The average frost-free period is 160 to 225 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Desolation and Fendall soils. Desolation soils are on the uneven slopes and have clayey and deeper sola. Fendall soils are 20 to 40 inches deep to a paralithic contact.
DRAINAGE AND PERMEABILITY: Well drained, slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Timber production and water supply. The coniferous forest is dominated by hemlock and Douglas-fir. The most common understory community in coniferous forest stands is salal-swordfern.
Hardwood stands are very common and usually have the salmonberry-swordfern community as understory. On recent burned over or cut over areas, there are salal, salmonberry, thimbleberry, swordfern, and hemlock seedlings.
DISTRIBUTION AND EXTENT: Central and north Coast Range in Oregon. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lincoln County, Oregon, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon
Cambic horizon - from 6 to 30 inches (BA, Bw1, Bw2 horizons).