LOCATION STONER CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Typic Haploxerepts
TYPICAL PEDON: Stoner gravelly sandy loam - on a south facing convex 5 percent slope under a cover of buckbrush, juniper, white oak, annual grasses and forbs at an elevation of 3,160 feet. (Colors are for dry soil unless, otherwise stated. When described May 26, 1966, the soil was dry throughout)
A1--0 to 1 inch; brown (10YR 5/3) gravelly sandy loam, dark brown (10YR 3/3 rubbed) moist, dark brown (10YR 3/4) moist faces of peds; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; 25 percent fine and moderately gravel; moderately acid (pH 5.8); abrupt smooth boundary. (1 to 2 inches thick)
A2--1 to 3 inches; brown (10YR 5/3) gravelly sandy loam, dark yellowish brown (10YR 3/4) moist; massive; slightly hard, friable, slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; common fine and few medium tubular pores; 25 percent fine and moderately gravel; moderately acid (pH 5.8); abrupt smooth boundary. (2 to 4 inches thick)
A3--3 to 12 inches; brown (10YR 5/3) gravelly sandy loam, dark yellowish brown (10YR 3/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and plastic; many fine and very fine roots; many fine tubular pores; few thin clay films in pores; 17 percent fine and medium gravel; moderately acid (pH 6.0); abrupt smooth boundary. (8 to 10 inches thick)
Bt1--12 to 21 inches; brown (10YR 5/3) gravelly sandy loam, dark brown (10YR 4/3) moist; very weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, sticky and plastic; common very fine, fine and medium roots; many fine tubular pores; few thin clay films in pores and on peds; 18 percent fine and medium gravel; moderately acid (pH 5.9); clear smooth boundary. (7 to 11 inches thick)
Bt2--21 to 27 inches; light yellowish brown (10YR 6/4) gravelly sandy loam, yellowish brown (10YR 5/4 rubbed) moist, yellowish brown (10YR 5/6) faces of peds, moist; very weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, sticky and plastic; common fine and parting to moderate medium subangular blocky; slightly hard, friable, sticky and plastic; common fine and very fine roots; common fine tubular pores; many thin and common moderately thick clay films in pores and on peds; 17 percent fine and medium gravel; moderately acid (pH 5.9); clear smooth boundary. (4 to 9 inches thick)
Bt3--27 to 36 inches; light yellowish brown (10YR 6/4) gravelly sandy loam, yellowish brown (10YR 5/6 rubbed) moist, dark yellowish brown (10YR 4/4) faces of peds, moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common fine and very fine roots; common fine tubular pores; many thin and common moderately thick clay films in pores and on peds; 20 percent fine and medium gravel; moderately acid (pH 5.8) abrupt smooth boundary. (8 to 11 inches thick)
2Bt--36 to 60 inches; strong brown (7.5YR 5/6) very gravelly heavy loam, yellowish brown (10YR 5/8) moist; massive; hard, firm, very sticky and plastic; few fine roots; few fine tubular pores; many moderately thick clay films in pores; 55 percent pebbles; moderately acid (pH 5.9).
TYPE LOCATION: Siskiyou County, California; about 6 miles (airline) southeast of Etna; 1/4 mile up Dockery Gulch from McConnaugh Gulch Road in Scott Valley;2,500 feet S and 1,800 feet W from the NE corner of section 5, T.41N., R.8W. Etna NE Quadrangle. (7.5 minute series)
RANGE IN CHARACTERISTICS: Thickness of the solum is 30 to 47 inches over unrelated 2B horizon or stratified C horizon. The mean annual soil temperature is 51 to 57 degrees F. The soil temperature exceeds 41 degrees F. from early March to early December (345 days) and exceeds 47 degrees F. from early April to early December. The soil moisture control section (5 to 20 inches) is dry in all parts from mid July to mid October (90 to 110 days). The particle-size control section (10 to 40 inches) ranges 8 to 18 percent clay, more than 15 percent soil coarser than very fine sand, 50 to 65 percent total sand and 15 to 35 percent rock fragments, mostly gravel. Some pedons have more rock fragments in the 2Bt horizon where present. Base saturation by ammonium acetate ranges from 75 to 95 percent in the A horizon and Bt horizon. Some pedons do not have a buried unrelated 2Bt horizon. Rock fragments, mostly gravel, on the soil surface, range from 20 to 30 percent.
The A horizon color is 10YR 4/2, 4/3, 5/2, 5/3, 5/4, 6/2, 6/3; 7.5YR 4/2, 5/2, 5/4. Moist color is 10YR 3/2, 3/3, 3/4; 7.5YR 3/2, or 3/4. Those colors that are dark lack the thickness to qualify for a mollic epipedon. Organic matter ranges from 1 to 4 percent. Clay content ranges from 8 to 17 percent. Rock fragments, mostly gravel range from 15 to 35 percent.
The Bt horizon color is 10YR 5/3, 5/4, 5/6, 6/3, 6/4, 6/6, 7/3; 7.5YR 5/4, 5/6 or 6/4, 6/6. Moist color is 10YR 3/3, 3/4, 4/3, 4/4, 5/3, 5/4, 5/6; 7.5YR 3/4, 4/4, or 5/4. Texture is gravelly sandy loam or gravelly loam. Clay content ranges from 8 to 17 percent. Rock fragments, mostly gravel range from 15 to 35 percent.
The C horizon where present is stratified with varying textures and amounts of rock fragments, but color ranges are similar to the B horizon.
COMPETING SERIES: These are the Arrastre, Barron, Bestrom, Cassolary, Clayton, Frailey, Green Bluff, Hudnut, Kartar, Koerling, Koseth, Minersville, Scala, and Tallowbox. Arrastre, Bestrom and Tallowbox have bedrock at depths of 20 to 40 inches. Barron, Clayton and Scala soils have less than 15 percent rock fragments in the particle-size control section. Cassolary soils are dry for 60 to 75 consecutive days. Frailey soils are dry 60 to 80 consecutive days, have a mean annual soil temperature of 47 to 51 degrees and have less than 52 percent saned throughout the profile. Green Bluff soils are 35 to 60 percent pyroclastic material and have less than 15 percent rock fragments in the textural control section. Hudnut and Kartar are dry for 75 to 90 consecutive days and have a mean annual soil temperature of 47 to 50 degrees F. Koerling and Kosath soils are calcarcous and are dry less than 80 days. Minersville soils have mean annual soil temperatures of 47 to 51 degrees F.
GEOGRAPHIC SETTING: Stoner soils are on terraces and alluvial fans. Slopes are 0 to 15 percent. These soils formed in alluvium from metamorphosed sedimentary and igneous rock with some rocks high in serpentine minerals. Elevation is 2,000 to 4,000 feet. The climate is continental and subhumid with warm dry summers and cold moist winters. Mean annual precipitation is 12 to 30 inches. Snowfall is 20 to 36 inches. The mean annual temperature is 47 to 51 degrees F. The mean January temperature is 32 to 36 degrees F. The mean July temperature is 67 to 69 degrees F. Frost-free period is 80 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Atter, Bidwell, Bonnet, Dotta, Duzel, Facey, Hilt, Jilson, Kinkel, Marpa, and Serpa soils. Atter soils lack a cambic horizon and have a sandy-skeletal control section. Bonnet soils have a mollic epipedon and calcareous loamy-skeletal control section. Bidwell, Dotta, Duzel, Facey, Hilt, Jilson, Kinkel, Marpa, and Serpa soils have an argillic horizon with more than 18 percent clay. Also, Bidwell, Dotta, Duzel, Facey, Jilson, and Serpa soils have a mollic epipedon. Hilt soils have a paralithic contact at depths of 20 to 40 inches. Kinkel and Marpa soils have more than 35 percent rock fragments in the control section. Serpa soils are poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff; moderate permeability.
USE AND VEGETATION: Principally cultivated crops of hay, pasture, and small grains, both irrigated and dryland. Where not cultivated, they are used for timber production and/or livestock grazing. The vegetation is white oak, black oak, mountain alder, buckbrush, manzanita, mountain whitethorn, deer brush, rabbitbrush, blue bunch wheatgrass, Idaho fescue, sandberg bluegrass, and annual brome grasses. At higher elevations and precipitation, ponderosa pine and Douglas-fir are present.
DISTRIBUTION AND EXTENT: Siskiyou County, California and may occur in the Klamath Mountain areas in norther California and southwester Oregon. The soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Siskiyou County, California, 1978.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 12 inches (A1, A2, A3).
Cambic horizon - the zone from 12 to 60 inches (Bt1, Bt2, Bt3, Bct).
ADDITIONAL DATA: This pedon was sampled by the Riverside Laboratory in June 1966. Pedon number is S66 Calif-47-10 published and is described in the California SSIR No. 24, page 384 to 385. Highway sample depths were: 0-12", 12-36", 36-60".