LOCATION INDLETON CAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Typic Haploxerepts
TYPICAL PEDON: Indleton extremely gravelly sandy loam--on a north facing slope of 75 percent under Douglas-fir, California hazel, canyon live oak, Pacific dogwood, and vetch at an elevation of 3,900 feet. (Colors are for dry soil unless stated otherwise. When described on September 14, 1982 the soil was dry throughout.)
The soil surface is partially covered by 45 percent gravel.
Oi--l to 0 inches; needles, twigs, leaves, branches and cones.
A1--0 to 5 inches; grayish brown (10YR 5/2) extremely gravelly sandy loam, dark brown (10YR 3/3) moist; weak very fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common fine, many very fine roots; common fine and very fine interstitial pores; 65 percent gravel; slightly acid (pH 6.5); gradual wavy boundary. (4 to 6 inches thick).
A2--5 to 11 inches; pale brown (10YR 6/3) extremely gravelly sandy loam, brown (10YR 4/3) moist; moderate very fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common coarse, medium, and fine, and many very fine roots; common fine and very fine interstitial pores; 70 percent gravel; slightly acid (pH 6.5); clear wavy boundary. (5 to 7 inches thick)
Bt1--11 to 22 inches; pale brown (10YR 6/3) extremely gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common coarse, medium, fine and very fine roots; common fine and very fine tubular pores; few thin clay films lining pores and as bridges; 65 percent gravel, 5 percent cobbles; moderately acid (pH 6.0); gradual wavy boundary. (5 to 12 inches thick)
Bt2--22 to 39 inches; pale brown (10YR 6/3) extremely gravelly sandy clay loam, yellowish brown (10YR 5/4) moist; common medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common medium, fine and very fine roots; common fine and very fine tubular pores; few thin clay films lining pores and as bridges; 65 percent gravel, 10 percent cobbles; moderately acid (pH 6.0); gradual wavy boundary. (16 to 18 inches thick).
BCt--39 to 60 inches; pale brown (10YR 6/3) extremely gravelly sandy loam, yellowish brown (10YR 5/6) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few medium, common fine and very fine roots; few fine and very fine tubular pores; few thin clay films lining pores and as bridges; 65 percent gravel, 10 percent cobbles; moderately acid (pH 6.0).
TYPE LOCATION: Trinity County, California; about 3 miles northwest of Hoosimbim Mountain, California; Highway 3 at Hayfork Summit, turn north onto dirt road, travel 1.2 miles to ridgetop, pit l,000 feet east of road and 300 feet down from ridgetop; 400 feet west 100 feet south of the northeast corner, section 29, T.32 N, R.10 W. Hayfork Summit Quadrangle.
RANGE IN CHARACTERISTICS: Reaction is slightly acid or moderately acid. The control section contains 18 to 25 percent clay and 45 to 80 percent rock fragments (mostly gravel). The mean annual soil temperature is 47 to 52 degrees F. The soil moisture control section is dry in all parts from July to mid October (about 90 to 120 days). The soil temperature at a depth of 20 inches exceeds 41 degrees F from about March 15 to December 1 (255 days), and exceeds 47 degrees F from about April 15 to November 15. Base saturation is above 60 percent in some part of the 10 to 30 inch zone, and ranges from 50 to 70 percent.
The A horizon is 10YR 5/3, 5/2, 6/3, 4/2, 7/3, 4/3, 4/4, or 6/4. Moist color is 10YR 3/3, 4/3, 3/4, or 4/4. Some subhorizon above 10 inches has dry value of 6 or more, and moist value or chroma of 4.
The Bt horizon is 10YR 5/3, 6/3, 6/4, 5/2, 7/4, or 7/3. Moist color is 10YR 4/4, 5/4, 5/6 or 5/8. It is extremely gravelly sandy loam, extremely gravelly sandy clay loam, very gravelly loam, or extremely gravelly loam. The B horizon in some pedons lack clay films. In pedons with clay films the B horizon contains less than 1.2 times the amount of clay in the horizons above.
COMPETING SERIES: These are the Brownbear, Caris, Dehart, Itat (T), Macreeing (T), Maki, McGuire, Olete, and Pardaloe series. The Brownbear, Caris, and Maki soils are less than 40 inches deep to bedrock. Itat soils have 2.5YR through 7.5YR hues. The McGuire soils have unconformable sand and gravel at 25 to 40 inches. The Pardaloe soils have mean annual soils temperature of 54 to 59 degrees F. Dehart soils have a solum thickness of less than 46 inches and are dry for 75 to 90 days. Macreeing soils are neutral or mildly alkaline and have a component of volcanic ash. Olete soils have bedrock at 20 to 30 inches.
GEOGRAPHIC SETTING: Indleton soils are on mountains. Elevation is 2,100 to 4,900 feet. Slopes are 50 to 75 percent. These soils formed in colluvium from metasedimentary rocks. The climate is characterized by cool, moist winters and warm, dry summers. Mean annual precipitation is 30 to 60 inches. Snowfall ranges from 6 to 40 inches. Mean January temperature is about 35 degrees F. Mean July temperature is about 68 degrees F. Mean annual temperature is 45 to 50 degrees F. The frost-free period is 90 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bamtush and Hoosimbim series and the competing Caris soils. The Hoosimbim and Bamtush soils have well developed argillic horizons and have 7.5YR and 5YR hues.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderate permeability.
USE AND VEGETATION: This soil is used for timber production, water supply, and wildlife habitat. Vegetation consists of Douglas-fir, California hazel, canyon live oak, Pacific dogwood, and brackenfern.
DISTRIBUTION AND EXTENT: Klamath Mountains of northern California. The soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Trinity County, California, Weaverville Area, 1990. Name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon--zone from the surface to a depth of 11 inches (A1, A2).
Cambic horizon--the zone from 11 to 60 inches (Bt1, Bt2, BCt).
Particle-size control section--the zone from 10 to 40 inches (A2, Bt1, Bt2, BCt).