LOCATION ROGERVILLE CAEstablished Series
TAXONOMIC CLASS: Fine, mixed, mesic Xeric Kanhaplohumults
TYPICAL PEDON: Rogerville silt loam, on a southwest facing 12 percent slope under a cover of mixed conifers at an elevation of 3975 feet, (1212 m). When described on 9/7/1995 the soil was dry throughout. (Colors are for dry soil unless otherwise noted).
Oi--0 to 2 inches, (0 to 5 cm); slightly decomposed pine litter.
A--2 to 7 inches, (5 to 18 cm); light brown (7.5YR 6/4) silt loam, reddish brown (5YR 4/4) moist; 23 percent clay; moderate fine and medium granular structure; slightly hard, very friable, slightly sticky, slightly plastic; many very fine and fine roots; many very fine and fine irregular and many medium irregular and few coarse tubular pores; 5 percent subangular gravel; moderately acid, pH 6.0 by Hellige-Truog; NaF pH 9.4; clear smooth boundary. (2 to 13 inches, (5 to 33 cm) thick)
Bt1--7 to 13 inches, (18 to 33 cm); strong brown (7.5YR 5/6) silty clay loam, yellowish red (5YR 4/6) moist; 35 percent clay; strong fine angular blocky structure; slightly hard, very friable, moderately sticky, moderately plastic; many very fine and fine roots and common medium roots; many very fine and fine irregular and many medium irregular and few coarse tubular pores; 75 percent discontinuous distinct clay films on faces of peds and in pores; 10 percent subangular gravel; moderately acid, pH 6.0 by Hellige-Truog; NaF pH 9.9; clear smooth boundary. ((0 to 13 inches, (0 to 33 cm) thick)
Bt2--13 to 24 inches, (33 to 61 cm); strong brown (7.5YR 5/6) silty clay, yellowish red (5YR 4/6) moist; 40 percent clay; strong fine angular blocky structure; slightly hard, very friable, moderately sticky, moderately plastic; common very fine to medium roots; many very fine and fine irregular and many medium irregular and common medium tubular pores; 60 percent discontinuous distinct clay films on faces of peds and in pores; 15 percent subangular gravel; strongly acid, pH 5.5 by Hellige-Truog; NaF pH 9.4; clear smooth boundary.
Bt3--24 to 34 inches, (61 to 86 cm); strong brown (7.5YR 5/8) gravelly silty clay loam, yellowish red (5YR 4/6) moist; 38 percent clay; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common fine and medium roots and few very fine roots; many very fine and fine irregular and many medium tubular pores; 50 percent discontinuous distinct clay films on faces of peds and in pores; 5 percent subangular cobbles and 15 percent subangular gravel; strongly acid, pH 5.5 by Hellige-Truog; NaF pH 9.4; clear smooth boundary.
Bt4--34 to 42 inches, (86 to 107 cm); strong brown (7.5YR 5/8) gravelly clay loam, strong brown (7.5YR 5/6) moist; 35 percent clay; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; few fine roots; many fine tubular and many very fine and fine irregular pores; 35 percent discontinuous distinct clay films on faces of peds and in pores; 10 percent subangular cobbles and 25 percent subangular gravel; moderately acid, pH 5.8 by Hellige-Truog; abrupt smooth boundary. (Combined thickness of the Bt2, Bt3 and Bt4 horizons is 18 to 47 inches, (46 to 119 cm) thick).
Bt5--42 to 51 inches, (107 to 130 cm); strong brown (7.5YR 5/8) extremely gravelly clay loam, strong brown (7.5YR 5/6) moist; 28 percent clay; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common fine tubular and few very fine and fine irregular pores; 25 percent discontinuous distinct clay films on faces of peds and in pores; 20 percent subangular cobbles and 60 percent subangular gravel; moderately acid, pH 5.8 by Hellige-Truog; abrupt wavy boundary. (0 to 34 inches, (0 to 86 cm) thick)
Cr--51 to 55 inches, (130 to 140 cm); moderately cemented talc schist bedrock.
TYPE LOCATION: Butte County, California, about 4.2 miles northeast of Featherfalls, 1400 feet east and 100 feet north of the southwest corner of Section 34, Township 21 N., Range 7 E., 39 degrees, 37 minutes, 46 seconds North latitude and 121 degrees, 11 minutes, 6 seconds West longitude, NAD27 - U.S.G.S. Quad: Cascade, California.
RANGE IN CHARACTERISTICS: Depth to paralithic bedrock is 40 to 60 inches, (102 to 152 cm). The mean annual soil temperature is 47 to 54 degrees F, (8 to 12 degrees C). The particle-size control section averages 36 to 50 percent clay and 0 to 20 percent rock fragments, mostly gravel. Mineralogy is mixed. Base saturation by sum of cations ranges from 20 to 35 percent to a depth of 13 inches, (33 cm) and is less than 20 percent to a depth of 51 inches, (130 cm). Calcium extractable bases exceed magnesium extractable bases throughout the profile.
The A horizon dry color is 7.5YR 5/4, 6/4, 5YR 5/4, 5/6 or 6/4. Moist color is 7.5YR 4/4, 5/3, 5YR 3/3, 3/4, 4/4, 4/6, 5/6, 2.5YR 3/4 or 4/6. Texture is silt loam, loam or sandy loam. Clay content ranges from 11 to 27 percent. Organic matter ranges from 3 to 10 percent. Rock fragments range from 5 to 15 percent gravel. NaF pH ranges from 9.4 to 11.5. Reaction ranges from very strongly acid to slightly acid.
The upper Bt horizon dry color is 7.5YR 5/6, 5YR 5/4, 6/4 or 6/6. Moist color is 5YR 4/4, 4/6, 2.5YR 3/4, 4/4 or 4/6. Texture is silty clay loam, clay loam, gravelly silty clay loam, gravelly clay loam or very gravelly clay loam. Clay content ranges from 30 to 38 percent. Organic matter ranges from 3 to 10 percent. Rock fragments range from 10 to 50 percent gravel. NaF pH ranges from 9.5 to 9.9. Reaction ranges from moderately acid to slightly acid.
The middle Bt horizon dry color is 7.5YR 5/6, 5/8, 5YR 5/6, 5/8, 6/6, 2.5YR 5/6 or 6/6. Moist color is 7.5YR 5/6, 5/8, 5YR 4/6, 5/6, 5/8, 2.5YR 3/6, 4/4, 4/6, 4/8, 5/6 or 6/6. Texture is silty clay, clay, silty clay loam, clay loam, gravelly clay loam or gravelly silty clay loam. Clay content ranges from 35 to 65 percent. Organic matter ranges from 0.20 to 1 percent. Rock fragments range from 0 to 35 percent gravel and 0 to 10 percent cobbles. NaF pH ranges from 8.0 to 9.9. Reaction ranges from very strongly acid to slightly acid.
The lower Bt horizon dry color is 10YR 6/4, 7/8, 7.5YR 7/8, or 5YR 6/6. Moist color is 10YR 5/4, 7.5YR 5/6, 7/8, 2.5YR 4/6, or 5/6. Texture is extremely gravelly clay loam, very gravelly silty clay loam, extremely gravelly silty clay loam, gravelly silty clay, silty clay or silty clay loam. Clay content ranges from 28 to 55 percent. Organic matter ranges from 0.20 to 0.5 percent. Rock fragments range from 5 to 80 percent gravel and 0 to 20 percent cobbles. NaF pH ranges from 8.8 to 9.9. Reaction ranges from very strongly acid to neutral.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Rogerville soils are on ultramafic Sierra Nevada mountains. Slopes range from 2 to 70 percent. These soils formed in residuum and colluvium weathered from ultramafic rocks, mainly talc schist and some serpentinite. Elevation is 3300 to 4200 feet, (1006 to 1280 m). Mean annual precipitation is 65 to 80 inches, (1651 to 2032 mm). The mean annual temperature is 52 to 54 degrees F, (11 to 12 degrees C). Frost free season is 140 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Jocal, Powellton, Sites and Toadtown soils. Jocal soils are very deep, fine-loamy, and formed from metasedimentary rocks. Powellton soils are very deep, are fine-loamy, have andic materials in the upper 15 inches, have parasesquic mineralogy and formed from medidiorite and metavolcanic rocks. Sites soils are very deep to paralithic contact of metasedimentary rock, are fine and have parasesquic mineralogy. Toadtown soils are very deep, fine, have andic materials in the upper 13 inches, have parasesquic mineralogy and have formed from metadiorite and metavolcanic rocks.
DRAINAGE AND PERMEABILITY: Well drained; moderate to high runoff; moderate saturated hydraulic conductivity in the A horizon and moderately slow in the Bt horizon.
USE AND VEGETATION: This soil is used for timber production, wildlife habitat and watershed. Vegetation is ponderosa pine, Douglas-fir, sugar pine, incense cedar, white fir, Pacific madrone, California black oak, and tanoak with an understory of deerbrush, whiteleaf manzanita, dogwood, brackenfern, princes pine, wood rose, scattered greenleaf manzanita and Pacific poison oak.
DISTRIBUTION AND EXTENT: Butte County, California and occur in (M261Ef) Granitic and Metamorphic Hills subsection of the (M261E) Sierra Nevada section. MLRA: 22A - Sierra Nevada Range. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Butte County, California 2005. Source of name from historic logging camp in the Feather Falls area.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 2 to 7 inches, (5 to 18 cm) (A)
Kandic horizon - zone from 7 to 51 inches, (18 to 130 cm) (Bt1, Bt2, Bt3, Bt4, Bt5)
Paralithic contact - zone from 51 to 55 inches, (130 to 140 cm).
Particle-size control section for this pedon: 7 to 27 inches, (18 to 69 cm).
The soil moisture control section - zone from 8 to 21 inches, (20 to 53 cm) is dry in all parts from about July 1 to October (about 90 days).
Difference between mean summer and mean winter soil temperatures is slightly more than 6 degrees C (borderline to isomesic).
ADDITIONAL DATA: Reference data from lab pedon number: 96P0132, NSSL, Lincoln, NE.