LOCATION REDCREST CA
Established Series
Rev: JTB/SAA/ET
10/2016
REDCREST SERIES
The Redcrest series consists of very deep, well drained soils formed in colluvium and residuum from siltstone and fine-grained sandstone. Redcrest soils are on mountains and slopes range from 15 to 75 percent. The mean annual precipitation is about 1520 milimeters and the mean annual air temperature is about 11 degrees C.
TAXONOMIC CLASS: Fine-silty, mixed, superactive, isomesic Dystric Eutrudepts
TYPICAL PEDON: Redcrest very paragravelly silt loam on a northeast facing slope of 74 percent under a canopy of coast redwood, tanoak, Pacific madrone, big-leaf maple, and western swordfern. (Colors are for moist soil unless otherwise stated.) When described on September 20, 2005 the soil was dry to 100 centimeters.
A1--0 to 9 centimeters; brown (10YR 4/3) very paragravelly silt loam, pale brown (10YR 6/3) dry; moderate medium granular structure; moderately hard, friable, slightly sticky and slightly plastic; many very fine and common fine, medium, and coarse roots; common very fine, fine and medium irregular pores; 45 percent paragravel; moderately acid (pH 5.9); clear smooth boundary.
A2--9 to 27 centimeters; very dark brown (10YR 2/2) very paragravelly silt loam, dark grayish brown (10YR 4/2) dry; moderate medium granular structure; moderately hard, friable, slightly sticky and slightly plastic; common very fine, fine, coarse, and very coarse, and many medium roots; common very fine, fine, and medium irregular pores; 50 percent paragravel; moderately acid (pH 5.8); clear smooth boundary. (Combined thickness of the A horizons is 5 to 36 centimeters thick)
Bt1--27 to 48 centimeters; olive brown (2.5Y 4/3) extremely paragravelly loam, light yellowish brown (2.5Y 6/3) dry; moderate fine subangular blocky structure; moderately hard, friable, slightly sticky and slightly plastic; common very fine, few fine, common medium, coarse, and very coarse roots; common very fine, and few fine tubular pores; few prominent clay films on all faces of peds; 74 percent paragravel, 2 percent paracobbles; moderately acid (pH 5.9); clear wavy boundary.
Bt2--48 to 67 centimeters; light olive brown (2.5Y 5/3) extremely paragravelly loam, pale yellow (2.5Y 7/3) dry; moderate fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine, few fine, many medium, and common coarse and very coarse roots; common very fine and few fine tubular pores; few prominent clay films on all faces of peds; 59 percent paragravel, 2 percent paracobbles; moderately acid (pH 6.0); gradual wavy boundary.
Bt3--67 to 85 centimeters; light olive brown (2.5Y 5/3) very paragravelly silt loam, pale yellow (2.5Y 7/3) dry; 10 percent coarse prominent yellowish brown (10YR 5/6) mottles; moderate fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine, many medium, and common coarse and very coarse roots; many very fine and few fine tubular pores; many distinct clay films on all faces of peds; 50 percent paragravel, 2 percent paracobbles; moderately acid (pH 5.9); gradual wavy boundary.
Bt4--85 to 110 centimeters; light olive brown (2.5Y 5/3) extremely paragravelly loam, pale yellow (2.5Y 7/3) dry; 10 percent coarse prominent yellowish brown (10YR 5/6) mottles; moderate fine and very fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine, common fine, many medium, common coarse, and common very coarse roots; common fine and few very fine tubular pores; few distinct clay films on all faces of peds; 68 percent paragravel, 15 percent paracobbles; moderately acid (pH 5.9); clear wavy boundary. (Combined thickness of the Bt horizons is 110 to 195 centimeters thick)
BCt--110 to 200 centimeters; light olive brown (2.5Y 5/3) extremely paragravelly loam, pale yellow (2.5Y 7/3) dry; 10 percent coarse prominent yellowish brown (10YR 5/6) mottles; moderate fine and very fine subangular blocky structure; hard, friable, slightly sticky and moderately plastic; few very fine and fine, and common medium roots; common very fine, and few fine tubular pores; few distinct clay films on rock fragments and few distinct clay films on all faces of peds; 69 percent paragravel, 20 percent cobbles; slightly acid (pH 6.4). (Combined thickness of the BCt horizons is 0 to 140 centimeters thick)
TYPE LOCATION: Humboldt County, California; Located approximately 4 kilometers west of the town of Redcrest, southwest quarter of the northeast quarter of section 12, T. 1S, R. 2E, HB&M; 40 degrees 23 minutes 42 seconds north latitude (40.3950000) and 123 degrees 54 minutes 1 second west longitude(-123.9002778); USGS Redcrest 7.5 minute series Quadrangle; UTM 10T 423586e, 4471991n; NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section, from a depth of 13 to 38 centimeters, is not dry in any part for as long as 90 cumulative days in normal years. The soils have a udic moisture regime.
Soil Temperature: The mean annual soil temperature at 50 centimeters is 10 to 13 degrees C. The difference between mean summer and mean winter temperature is less than 6 degrees C. The soils have an isomesic temperature regime.
Base Saturation: More than 60 percent by ammonium acetate in one or more horizons between 25 and 75 centimeters.
Surface Fragments: 0 to 5 percent paragravel
Particle size control section (weighted average):
Pararock fragments: 15 to 60 percent subangular moderately cemented siltstone paragravel, 0 to 15 percent subangular moderately cemented siltstone paracobbles
Clay content: 18 to 30 percent
O horizon (where present)
Value: 2 through 3, 2 to 4 dry
Chroma: 1 or 2, moist or dry
Pararock fragments: 0 to 5 percent moderately cemented siltstone paragravel
Reaction: very strongly acid to neutral
A horizon
Hue: 10YR or 2.5Y
Value: 2 to 4, 4 to 6 dry
Chroma: 1 to 3, moist or dry
Texture of fine earth: loam and silt loam
Pararock fragments: 0 to 50 percent moderately cemented siltstone paragravel
Clay content: 12 to 27 percent
Reaction: strongly acid to neutral
Upper Bt horizon
Hue: 10YR, 2.5Y, and 5Y moist and dry
Value: 4 or 5, 5 to 7 dry
Chroma: 3 to 6, moist or dry
Texture of fine earth: loam, silt loam, silty clay loam, and clay loam
Pararock fragments: 15 to 75 percent moderately cemented siltstone paragravel , and 0 to 15 percent moderately cemented siltstone paracobbles, and 0 to 5 percent subangular moderately cemented siltstone parastones
Clay content: 18 to 30 percent
Reaction: strongly acid to moderately acid
Lower Bt horizon
Hue: 10YR, 2.5Y, and 5Y moist and dry
Value: 4 or 5, 5 to 7 dry
Chroma: 3 to 6 moist or dry
Texture of fine earth: loam, silt loam, silty clay loam, and clay loam
Pararock fragments: 35 to 75 percent moderately cemented siltstone paragravel, 0 to 20 percent subangular moderately cemented siltstone paracobbles, and 0 to 5 percent subangular moderately cemented siltstone parastones.
Clay content: 20 to 35 percent
Reaction: very strongly acid to slightly acid
C horizon
Hue: 10YR, 2.5Y, and 5Y moist and dry
Value: 4 or 5, 5 to 7 dry
Chroma: 3 to 6 moist or dry
Texture of fine earth: loam, silt loam, silty clay loam, and clay loam
Pararock fragments: 35 to 89 percent moderately cemented siltstone paragravel in the lower part, 0 to 20 percent moderately cemented siltstone paracobbles and 0 to 5 percent moderately cemented siltstone parastones.
Clay content: 20 to 35 percent
Reaction: very strongly acid to slightly acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Redcrest soils are on slightly convex to linear mountain slopes.. Slopes are 5 to 75 percent. Elevations are 60 to 640 meters. These soils formed in colluvium and residuum from siltstone and fine-grained sandstone. The climate is humid with cool, foggy summers and cool, wet winters. Mean annual precipitation is 1140 to 2160 millimeters. Mean January temperature is about 9 degrees C, mean July temperature is about 14 degrees C, and the mean annual temperature is 10 to 13 degrees C. Frost free season is about 240 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Rootcreek (TCA),
Salmoncreek (TCA), and
Scoutcamp (TCA) soils. Rootcreek soils have redoximorphic features between 50 and 100 centimeters from the soil surface. Salmoncreek soils have redoximorphic features between 10 to and 25 centimeters from the soil surface. Scoutcamp soils have less than 15 percent paragravel in the particle size control section. Rootcreek soils are on linear to concave positions and in drainageways. Salmoncreek soils are on linear to concave positions on broad summits and backslopes, ridges, and mountain slopes. Scoutcamp soils are on linear and to slightly concave to or convex backslope positions on mountain slopes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, high runoff, moderately high saturated hydraulic conductivity.
USE AND VEGETATION: This soil is used for commercial timber production, wildlife habitat, watershed, and recreation. Natural vegetation includes coast redwood, Douglas-fir, tanoak, California hazel, California huckleberry, salal, western swordfern, Douglas iris, and thimbleberry.
DISTRIBUTION AND EXTENT: California Coastal Redwood Belt; MLRA 4B. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Humboldt County, South Part, California, 2010. The name is from the town of Redcrest.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon - the zone from 0 to 27 centimeters (A horizons).
2. Cambic horizon - the zone from 27 to 200 centimeters (Bt1, Bt2, Bt3, Bt4, and BCt horizons).
3. Particle-size control section - the zone from 25 to 100 centimeters (A2, Bt1, Bt2 Bt3, and Bt4 horizons) averages 22 percent clay and
ADDITIONAL DATA: NASIS User Pedon ID: 02CA601111
Pedon No. 06N0220 was analyzed by the National Soil Survey Laboratory. Particles greater than 2 mm reported in the Lab Characterization data are parafragments.
Soil classified using the 12th Edition of the Keys to Soil Taxonomy.
National Cooperative Soil Survey
U.S.A.