LOCATION TANGLE CAEstablished Series
TAXONOMIC CLASS: Clayey-skeletal, magnesic, frigid Mollic Palexeralfs
TYPICAL PEDON: Tangle very gravelly sandy loam - on a 25 percent northeast-facing concave slope at 5,200 feet elevation under a Jeffrey pine, incense-cedar stand. (Colors are for dry soil unless otherwise stated. When described on 5/16/79 the soil was moist throughout.)
01--2 to 1 inches; fresh pine needles and twigs.
02--1 to 0 inches; decomposed pine needles.
A--0 to 1 inches; dark brown (7.5YR 4/3) very gravelly sandy loam, dark reddish brown (5YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; 40 percent pebbles; medium acid (pH 6.0); clear smooth boundary. (1 to 4 inches thick)
AB--1 to 6 inches; brown (7.5YR 5/4) very gravelly sandy loam, dark reddish brown (5YR 3/4) moist; weak fine and medium subangular blocky structure; soft very friable, nonsticky and nonplastic; few very fine, few fine, and common medium roots; few fine and common very fine tubular and interstitial pores; 30 percent pebbles and 5 percent cobbles; slightly acid (pH 6.4); abrupt wavy boundary. (4 to 6 inches thick)
BAt--6 to 16 inches; pale brown (10YR 6/3) very cobbly sandy loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine, and common fine, medium and coarse roots; common very fine and fine tubular and interstitial pores- 35 percent pebbles and 25 percent cobbles; few thin clay films in pores and as bridges; slightly acid (pH 6.4); clear wavy boundary. (7 to 12 inches)
Btl--16 to 28 inches; yellowish brown (10YR 5/4) very cobbly clay, brown (10YR 4/3) moist; strong medium subangular blocky structure; hard, friable, sticky and plastic; few very fine and fine, common medium and coarse roots; few fine tubular pores; many moderately thick clay films on peds and in pores; 20 percent pebbles and 30 percent cobbles; slightly acid (pH 6.4); abrupt smooth boundary. (4 to 13 inches thick)
Bt2--28 to 43 inches; yellowish brown (10YR 5/4) very stony clay loam, dark yellowish brown (10YR 4/4) moist; strong fine angular blocky structure, slightly hard, friable, very sticky and very plastic; few very fine and coarse roots; few very fine tubular pores; continuous thick clay films on peds and in pores; 5 percent pebbles, 15 percent cobbles, and 25 percent stones; slightly acid (pH 6.5); gradual wavy boundary. (12 to 17 inches thick)
BCt--43 to 57 inches; dark yellowish brown (10YR 4/6) cobbly sandy clay loam, dark yellowish brown (10YR 4/4) moist; strong medium angular blocky structure; slightly hard, friable, sticky and plastic; few very fine and fine roots; few very fine tubular pores; many thick clay films on peds, in pores, and as bridges; slightly acid (pH 6.5); abrupt wavy boundary. (13 to 32 inches thick)
R--57+ inches; hard, highly fractured serpentinized peridotite.
TYPE LOCATION: 0.5 miles off 41N08 road to Rock Fence Lake, about 100 yards before meadow on landslide bench below road; Siskiyou County, California; 1,200 feet west and 2,160 feet south from the NW corner; SE1/4, SE1/4, NE1/4 Section 34, T.41N., R.7W.
RANGE IN CHARACTERISTICS: The soil is 40 to 60 inches deep to hard, fractured bedrock. The mean annual soil temperature is 38 to 46 degrees; the mean January soil temperature is 30 degrees to 35 degrees; the mean July soil temperature is 45 to 55 degrees. The soil temperature exceeds 41 degrees. from April 15 to November 20, and is greater than 47 degrees from May 20 to October 20. The soil between the depths of 16 to 25 inches is dry in all parts from August 1 to October 15, and moist in some or all parts the rest of the year. The soil is medium to slightly acid.
The A horizon has colors of 7.5YR 4/3, 4/4 or 5/4. Moist colors are 5YR 3/2, 3/3 or 3/4. It is sandy loam or loam, with 10 to 15 percent clay modified by 30 to 45 percent gravel and 5 to 15 percent cobbles.
The Bt horizons have colors of 10YR 5/4, 6/3; 7.5YR 5/4 or 5/6. Moist colors are 10YR 4/3, 4/4; 7.5YR 3/4 or 4/4. It is very cobbly or very gravelly clay in the upper part and very stony or very cobbly clay loam in the lower part. There is 15 to 20 percent gravel and 30 to 40 percent cobbles and stones. The weighted average of the family control section is greater than 35 percent clay.
The R horizon is hard, highly fractured serpentinized ultramafic rock. Some soil or saprolite may be present in fractures.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Tangle soils occur on mountain sideslopes in coluvium and landslide benches. Slopes are 15 to 50 percent. The soils formed from ultramafic parent rocks, generally serpentinized periodotite. Elevations are about 4,800 to 6,800 feet. The climate is humid, with warm dry summers and cold moist winters. Mean annual precipitation is 45 to 60 inches. Seasonal snowfall is 35 to 50 inches. Mean January temperature is 22 to 27 degrees; mean July temperature is 60 to 65 degrees; mean annual air temperature is 37 to 45 degrees.
GEOGRAPHICALLY ASSOCIATED SOILS: See remarks.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow permeability; medium to rapid runoff.
USE AND VEGETATION: Used for watershed, wildlife habitat, and timber production. The native vegetation includes Jeffrey pine, huckleberry oak, incense-cedar, and beargrass.
DISTRIBUTION AND EXTENT: Mountains of Northern California. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: Siskiyou County, California, 1982. Klamath National Forest Area.
REMARKS: National Soil Survey Laboratory sample S79CA093001. This series was established to identify and map a new family in a survey area that classified soil map components only to the family level.
OSED scanned by SSQA. Last revised by state on 8/82.