LOCATION BURRISCREEK CA
Established Series
Rev: SAA/RLM/ACF/JPS/ET/KP
01/2013
BURRISCREEK SERIES
The Burriscreek series consists of very deep, well drained soils formed from volcanic ash over marine deposits. Burriscreek soils are on upper, dissected marine terraces and have slopes of 2 to 15 percent. The mean annual precipitation is about 1650 millimeters (65 inches) and the mean annual air temperature is about 11 degrees C (52 degrees F).
TAXONOMIC CLASS: Fine-silty, isotic, isomesic Andic Palehumults
TYPICAL PEDON: Burriscreek silt loam - on a gentle slope of 6 percent under redwood, California huckleberry, salal, bracken fern and swordfern, at 213 meters (700 feet) elevation. (Colors are for moist soil unless otherwise stated. When described on June 19, 2007 the soil was slightly moist throughout.)
Oi--0 to 2 centimeters (0 to 1 inches); black (10YR 2/1) slightly decomposed needles, leaves and twigs, very dark grayish brown (10YR 3/2) dry; 98 percent unrubbed, 95 percent rubbed; loose, loose, nonsticky and nonplastic; common very fine, fine and medium roots; many very fine and fine interstitial pores; 5 percent wood fragments; very strongly acid (pH 5.0); clear smooth boundary. (0 to 15 centimeters thick)
A1--2 to 7 centimeters (1 to 3 inches); very dark grayish brown (10YR 3/2) brown ashy silt loam, grayish brown (10YR 5/2) dry; moderate very fine subangular blocky and weak very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine and common very fine and medium roots; many very fine and fine tubular pores; very strongly acid (pH 4.7); clear broken boundary. (5 to 10 centimeters thick)
A2--7 to 20 centimeters (3 to 20 inches); dark grayish brown (10YR 4/2) ashy silt loam, light brownish gray (10YR 6/2) dry; weak very fine and fine subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common very fine, fine, and medium roots; common very fine and fine tubular pores; very strongly acid (pH 4.8); clear wavy boundary. (5 to 15 centimeters thick)
B/A--20 to 34 centimeters (20 to 13 inches); 60 percent dark yellowish brown (10YR 4/4) ashy silty clay loam, light yellowish brown (10YR 6/4) dry; 40 percent dark grayish brown (10YR 4/2) silty clay loam, light brownish gray (10YR 6/2) dry; moderate fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine, medium and coarse roots; common very fine and fine tubular pores; very strongly acid (pH 4.7); clear wavy boundary. (0 to 10 centimeters thick)
Bt1--34 to 50 centimeters (13 to 20 inches); strong brown (7.5YR 5/6) ashy silty clay loam, reddish yellow (7.5YR 6/6) dry; moderate fine and weak medium subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common fine, medium and coarse roots; common very fine and fine irregular and common fine tubular pores; few distinct clay films on ped faces; 3 percent gravel and 3 percent paragravel; very strongly acid (pH 4.7); clear wavy boundary.
Bt2--50 to 85 centimeters (20 to 34 inches); yellowish brown (10YR 5/6) clay loam, brownish yellow (10YR 6/6) dry; moderate fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and medium roots; common fine irregular and tubular pores; few faint clay films on ped faces; 5 percent gravel and 5 percent paragravel; few, distinct, fine and medium yellowish brown (10YR 5/8), sharp masses of relic iron accumulation in the matrix; very strongly acid (pH 4.8); gradual smooth boundary. (Combined thickness of the upper Bt horizons is 50 to 100 centimeters)
Bt3--85 to 111 centimeters (34 to 44 inches); 70 percent yellowish brown (10YR 5/4) paragravelly clay loam, light yellowish brown (10YR 6/4) dry; 30 percent brown(7.5YR 4/3) paragravelly clay loam, light brown (7.5YR 6/3) dry; moderate fine and medium subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common very fine and fine irregular and common fine and medium tubular pores; few distinct clay films on ped faces; few, distinct, fine and medium yellowish brown (10YR 5/8), sharp masses of relic iron accumulation in the matrix; 5 percent gravel and 15 percent paragravel; very strongly acid (pH 4.6); clear wavy boundary.
Bt4--111 to 131 centimeters (44 to 52 inches); pale yellow (2.5Y 7/4) gravelly clay loam, pale yellow (2.5Y 8/4) dry; weak fine subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; moderately few fine and common medium roots; common very fine irregular pores; few distinct clay films on ped faces; common, prominent, medium yellowish brown (10YR 5/8) masses of iron accumulation in the matrix; 20 percent gravel and 15 percent paragravel; very strongly acid (pH 4.5); abrupt smooth boundary. (Combined thickness of the lower Bt horizons is 45 to 100 centimeters)
2Bt5--131 to 170 centimeters (52 to 67 inches); strong brown (7.5YR 5/6) very gravelly sandy clay loam, reddish yellow (7.5YR 7/6) dry; weak medium and moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common very fine and fine interstitial pores; common distinct clay films on ped faces and rock fragments; common, distinct medium ferriargillans in the matrix; 45 percent gravel; very strongly acid (pH 4.7). (0 to 50 centimeters thick)
TYPE LOCATION: Humboldt County, California; approximately 23 meters (75 feet) west of unnamed spur road; northeast quarter, southeast quarter, Section 11, T.8N. R.1W. 41 degrees, 5 minutes, 37.2 seconds north latitude and 124 degrees, 8 minutes, 27.2 seconds west longitude; HBLM, USGS Trinidad Quadrangle; UTM Zone 10 404185mE 4549783mN; NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil is usually moist in all parts in the soil moisture control section in most years, but becomes nearly dry in the upper part from about September 15 to October 15 in most years. The soils have an udic soil moisture regime.
Soil temperature: The mean annual soil temperature is 10 to 13 degrees C (50 to 55 degrees F). The difference between mean summer and mean winter temperature is 2 to 4 degrees C. The soils have an isomesic temperature regime.
Reaction: strongly or very strongly acid
Particle-Size Control Section (weighted average):
Rock fragments: 0 to 5 percent gravel and 0 to 5 percent paragravel.
Clay content: 30 to 35 percent clay.
O horizon
Hue: 10YR.
Value: 2 through 6 dry and moist.
Chroma: 1 through 4 dry and moist.
Texture: slightly decomposed organic material.
Wood fragments: 0 to 35 percent.
Reaction: moderately to very strongly acid.
A horizon
Hue: 10YR.
Value: 5 or 6 dry, 3 through 6 moist.
Chroma: 1 through 3 dry, and 1 or 2 moist.
Texture of fine earth: ashy silt loam.
Clay content: 20 to 27 percent.
Upper Bt horizon
Hue: 10YR.
Value: 6 dry, 4 or 5 moist.
Chroma: 6 dry, 4 through 6 moist.
Texture of fine earth: ashy silty clay loam.
Rock fragments: 0 to 5 percent gravel; 0 to 5 percent paragravel.
Clay content: 28 to 35 percent.
Lower Bt horizon
Hue: 7.5YR, 10YR or 2.5Y.
Value: 6 through 8 dry, 4 through 7 moist.
Chroma: 4 through 8 dry, 3 through 8 moist.
Texture of fine earth: silty clay loam.
Rock fragments: 0 to 20 percent gravel; 0 to 15 percent paragravel.
Clay content: 28 to 35 percent.
Redoximorphic features: fine iron-manganese masses in the matrix
Quantity: very few to common
Hue: 7.5YR or 10YR
Value: 5 to 6
Chroma: 4 through 8
2Bt horizon
Hue: 7.5YR, 10YR or 2.5Y.
Value: 6 through 8 dry, 4 through 7 moist.
Chroma: 4 through 8 dry, 3 through 8 moist.
Texture of fine earth: sandy clay loam.
Rock fragments: 15 to 55 percent gravel; 0 to 15 percent paragravel.
Clay content: 25 to 32 percent.
COMPETING SERIES: At this time there are no other series in this family.
GEOGRAPHIC SETTING: These soils are on upper, dissected marine terraces, and have slopes of 2 to 15 percent. Elevations are 158 to 244 meters (520 to 800 feet). These soils form in volcanic ash over marine deposits. The climate is humid with cool, foggy summers and cool, rainy winters. Mean annual precipitation is 1520 to 1800 millimeters (60 to 70 inches). Mean January temperature is about 8 degrees C; mean July temperature is about 13 degree C; and the mean annual temperature is 10 to 13 degrees C (50 to 55 degrees F). Frost free season is about 260 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Savagecreek soils. Savagecreek soils are fine with greater than 35 percent clay in the particle size control section and are poorly drained with redoximorphic features near the surface. Savagecreek soils are found on linear to slightly concave, nearly level summit positions generally above the Burriscreek soils.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: well drained; medium runoff; moderately low saturated hydraulic conductivity.
USE AND VEGETATION: This soil has been used for commercial timber and is used for wildlife recreation, and watershed. Natural vegetation consists of redwood, Sitka spruce, Douglas-fir, western hemlock, tanoak, cascara, western thimbleberry, California huckleberry, salmonberry, salal, and swordfern.
DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Humboldt County, California, 2013. The source of the name is from Burriscreek Creek, a small stream south of Candy Mountain.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon - the zone from 0 to 7 centimeters (Oi and A horizons).
2. Andic soil properties from 20 to 50 centimeters (B/A and Bt1 horizons.
3. Argillic horizon - the zone from 34 to 170 centimeters (Bt1, Bt2, Bt3, Bt4 horizons).
4. Particle-size control section - the zone from 34 to 84 centimeters, averages 32 percent clay, and 4 percent gravels.
5. Palehumult feature - clay maximum is 36 percent in Bt3 and does not drop off by more than 20 percent in the upper 150 centimeters.
6. Redoximorphic features from 50 to 111 centimeters are relic (Bt2 and Bt3).
ADDITIONAL DATA:
NASIS User Pedon ID 07CA605114
NSSL, Lincoln Lab sample 08N0238
Textures are apparent field textures in accordance with Tech Note #12 (2004)
Soil classified using the 11th Edition of the Keys to Soil Taxonomy. 10th classification was that of fine, isotic, isomesic Andic Haplohumults.
National Cooperative Soil Survey
U.S.A.