LOCATION SCHOTT CAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, semiactive, mesic Andic Haploxeralfs
TYPICAL PEDON: Schott very gravelly loam, on an east facing 27 percent slope under a cover of canyon live oak, ponderosa pine, California black oak, Douglas-fir, incense cedar, whiteleaf manzanita, Pacific poison oak and California laurel at an elevation of 2940 feet, (894 m). When described on 6/12/2001 the soil was dry throughout. (Colors are for dry soil unless otherwise noted).
Oi--0 to 2 inches, (0 to 5 cm); slightly decomposed plant material; few very fine roots; abrupt smooth boundary.
A--2 to 6 inches, (5 to 15 cm); light brown (7.5YR 6/4) very gravelly loam, brown (7.5YR 4/3) moist; 24 percent clay; strong fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine roots and common medium roots; many very fine, fine and medium tubular and irregular pores and common coarse tubular and irregular pores; 5 percent stones, 10 percent cobbles, and 20 percent gravel; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 9.5; abrupt smooth boundary. (2 to 9 inches, (5 to 23 cm) thick)
Bt1--6 to 13 inches, (15 to 33 cm); reddish brown (5YR 5/4) very gravelly clay loam, reddish brown (5YR 4/3) moist; 28 percent clay; moderate fine and medium granular structure; slightly hard, friable, moderately sticky, moderately plastic; many very fine, fine and medium roots and common coarse roots; many very fine, fine and medium irregular and tubular pores and common coarse irregular and tubular pores; 80 percent continuous faint clay films; 5 percent stones, 10 percent cobbles, and 20 percent gravel; slightly acid, pH 6.4 by Hellige-Truog; NaF pH 10.0; clear smooth boundary.
Bt2--13 to 22 inches, (33 to 56 cm); reddish brown (5YR 5/4) very cobbly clay loam, reddish brown (5YR 4/4) moist; 30 percent clay; weak fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common very fine, fine and medium roots and few coarse roots; many very fine, fine and medium tubular pores; 80 percent continuous faint clay films; 10 percent stones, 20 percent gravel, and 30 percent cobbles; slightly acid, pH 6.3 by Hellige-Truog; NaF pH 10.0; clear smooth boundary.
Bt3--22 to 40 inches, (56 to 102 cm); reddish brown (5YR 5/4) extremely gravelly clay loam, reddish brown (5YR 4/4) moist; 32 percent clay; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common very fine, fine and medium roots and few coarse roots; many very fine, fine and medium tubular pores; 80 percent continuous faint clay films; 10 stones, 30 percent cobbles, and 35 percent gravel; slightly acid, pH 6.2 by Hellige-Truog; NaF pH 9.5; clear smooth boundary.
Bt4--40 to 50 inches, (102 to 127 cm); brown (7.5YR 5/4) extremely gravelly sandy clay loam, brown (7.5YR 4/4) moist; 31 percent clay; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common very fine, fine and medium roots; many very fine, fine and medium tubular pores; 80 percent continuous faint clay films; 10 percent stones, 30 percent cobbles, and 40 gravel; slightly acid, pH 6.2 by Hellige-Truog; abrupt smooth boundary. (Combined thickness of the Bt horizon is 31 to 58 inches, (79 to 147 cm) thick).
R--50 inches, (127 cm); strongly cemented mudflow breccia bedrock; slightly acid, pH 6.5 by Hellige-Truog.
TYPE LOCATION: Butte County, California, about 1.25 miles east of Forest Ranch Cemetery, approximately 1100 feet south and 300 feet west of the northeast corner of Section 33, Township 24 N., Range 3 E., 39 degrees, 53 minutes, 58 seconds North latitude and 121 degrees, 38 minutes, 13 seconds West longitude, NAD83 - U.S.G.S. Quad: Cohasset, California.
RANGE IN CHARACTERISTICS: Depth to lithic bedrock is 40 to 60 inches, (102 to 152 cm). The mean annual soil temperature is 52 to 59 degrees F, (11 to 15 degrees C). The particle-size control section averages 18 to 35 percent clay and 35 to 75 percent rock fragments, mostly gravel. Mineralogy is mixed. NaF pH ranges from 9.5 to 11.0 to a depth of 20 inches, (51 cm). Rock fragments on the surface range from 5 to 25 percent gravel, 0 to 15 percent cobbles, 0 to 15 percent stones and 0 to 5 percent boulders.
The A horizon dry color is 7.5YR 6/3, 6/4 or 5YR 6/4. Moist color is 7.5YR 3/3, 4/3, 4/4, 5YR 3/3 or 4/3. Texture is sandy loam, gravelly sandy loam, gravelly loam or very gravelly loam. Clay content ranges from 15 to 25 percent. Rock fragments range from 5 to 35 percent gravel, 0 to 10 percent cobbles and 0 to 5 percent stones. NaF pH ranges from 9.5 to 10.5. Reaction ranges from slightly acid to neutral.
The Bt horizon dry color is 7.5YR 5/4, 5/6, 6/4, 6/6, 5YR 5/4, 5/6, 6/4 or 10YR 6/4. Moist color is 7.5YR 3/3, 4/3, 4/4, 4/6, 5/4, 5/6, 5YR 4/3 or 4/4. Texture is gravelly sandy loam, gravelly sandy clay loam, gravelly loam, gravelly clay loam, and their very and extremely or very cobbly equivalents. Clay content ranges from 18 to 35 percent. Rock fragments range from 15 to 70 percent gravel, 0 to 30 percent cobbles and 0 to 10 percent stones. NaF pH ranges from 9.0 to 11.0. Reaction ranges from strongly acid to slightly acid.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Schott soils are on ridge tops and side slopes on Cascade mountains. Slopes range from 3 to 70 percent. These soils formed in residuum and colluvium weathered from volcanic mudflow breccia. Elevation is 1400 to 3600 feet, (427 to 1097 m). Mean annual precipitation is 40 to 72 inches, (1016 to 1829 mm). The mean annual temperature is 52 to 58 degrees F, (11 to 14 degrees C). Frost free season is 155 to 230 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Tusccoll and Paradiso soils. Tusccoll soils are on back slopes, are fine-loamy and very deep. Paradiso soils are on ridge tops, are fine and very deep.
DRAINAGE AND PERMEABILITY: Well drained; low to medium runoff; moderate to moderately rapid saturated hydraulic conductivity in the A horizon and moderately slow to moderately rapid in the Bt horizon.
USE AND VEGETATION: This soil is used for home site development, timber production, wildlife habitat and watershed. Vegetation is ponderosa pine, California black oak, Douglas-fir, canyon live oak, incense cedar, sugar pine, tanoak, whiteleaf manzanita, toyon, deerbrush, Pacific poison oak, bigleaf maple, California buckthorn, greenleaf manzanita, lemon ceanothus, brackenfern, California laurel and California torreya.
DISTRIBUTION AND EXTENT: Butte County, California and occur in the M261DI (Shingletown-Paradise) subsection of the M261D (Southern Cascade) section. MLRA 22B Southern Cascade Mountains. The soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Butte County, California 2005. Source of name is from Schott Road in Forest Ranch.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 2 to 6 inches, (5 to 15 cm) (A)
Argillic horizon - zone from 13 to 50 inches, (33 to 127 cm) (Bt2, Bt3, Bt4)
Lithic contact - 50 inches, (127 cm)
Particle-size control section - zone from 13 to 33 inches, (33 to 84 cm)
Assumption was made on andic subgroup placement based on geographically associated Paradise series.
The soil moisture control section - zone from 10 to 40 inches, (25 to 102 cm) is dry in all parts from about June to October (about 135 days).