LOCATION SLEEPYHOLLOW CA

Established Series
REV: SAA/ET
08/2016

SLEEPYHOLLOW SERIES

The Salmoncreek series consists of very deep, poorly drained soils formed in colluvium and residuum from siltstone. Salmoncreek soils are on mountains and slopes range from 2 to 50 percent. The mean annual precipitation is about 1015 milimeters and the mean annual air temperature is about 11 degrees C.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, isomesic Humic Dystrudepts

TYPICAL PEDON: Salmoncreek silty clay loam on a southwest-facing convex slope of 25 percent under coast redwood, red alder, oxalis, swordfern, Himalayan blackberry, and salal at 199 meters elevation. (Colors are for moist soil unless otherwise stated. When described September 10, 2003, the soil was moist throughout.)

Oi--0 to 9 centimeters; black (10YR 2/1) slightly decomposed plant material; about 90 percent fiber, 80 percent rubbed; strongly acid (pH 5.2); clear wavy boundary. (0 to 9 centimeters thick)

A--9 to 24 centimeters; very dark brown (10YR 2/2) silty clay loam, grayish brown (10YR 5/2) dry; strong fine subangular blocky structure; hard, friable, slightly sticky and moderately plastic; many very fine and common fine roots; many very fine dendritic tubular and common fine dendritic tubular pores; neutral (pH 6.6); gradual wavy boundary. (9 to 17 centimeters thick)

Bt1--24 to 50 centimeters; olive brown (2.5Y 4/3) silty clay loam, pale brown (10YR 6/3) dry; strong medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine, common fine and medium roots; common very fine irregular pores; few distinct very dark grayish brown (10YR 3/2) clay films on all faces of peds; 5 percent fine distinct grayish brown (10YR 5/2) iron depletions in matrix and 15 percent fine distinct yellowish brown (10YR 5/6) iron-manganese masses in matrix; moderately acid (pH 6.0); gradual wavy boundary.

Bt2--50 to 66 centimeters; olive brown (2.5Y 4/3) silty clay loam, pale brown (10YR 6/3) dry; strong medium subangular blocky structure; hard, friable, very sticky and very plastic; common very fine and fine roots; common very fine irregular pores; common distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 10 percent fine distinct grayish brown (10YR 5/2) iron depletions in matrix and 20 percent fine distinct dark yellowish brown (10YR 4/6) iron-manganese masses in matrix; moderately acid (pH 6.0); gradual wavy boundary.

Bt3--66 to 85 centimeters; olive brown (2.5Y 4/3) silty clay loam, pale brown (10YR 6/3) dry; strong medium subangular blocky structure; hard, friable, very sticky and very plastic; common very fine, fine, and medium roots; common very fine and fine dendritic tubular pores; common distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 25 percent fine distinct grayish brown (10YR 5/2) iron depletions in matrix and 35 percent medium distinct dark yellowish brown (10YR 4/6) iron-manganese masses in matrix; moderately acid (pH 5.8); gradual wavy boundary. (combined thickness of Bt horizons is 29 to 122 centimeters)

Btg1--85 to 132 centimeters; grayish brown (2.5Y 5/2) silty clay loam, light gray (2.5Y 7/2) dry; moderate medium subangular blocky structure; hard, friable, very sticky and very plastic; common very fine and fine roots; common very fine irregular and very fine dendritic tubular pores; common distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 35 percent medium distinct dark yellowish brown (10YR 4/6) iron-manganese masses in matrix; moderately acid (pH 5.8); gradual wavy boundary.

Btg2--132 to 160 centimeters; grayish brown (2.5Y 5/2) silty clay loam, light gray (2.5Y 7/2) dry; moderate medium subangular blocky structure; hard, friable, very sticky and very plastic; common very fine roots; common very fine irregular and common very fine dendritic tubular pores; few distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 35 percent medium distinct strong brown (7.5YR 4/6) iron-manganese masses in matrix; moderately acid (pH 6.0). (combined thickness of Btg horizons is 40 to 122 centimeters)

TYPE LOCATION: Humboldt County, California; WGS84 Decimal degrees 40.6366944 latitude and -124.1624167 longitude; USGS Fields Landing Quadrangle; UTM Zone 10 403111mE 4498660mN; NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section 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: By the sum of cations is greater than 35 percent at 125cm below the upper boundary of the argillic horizon.

Depth to Redoximorphic Features: 10 to 25 centimeters

Particle size control section (weighted average):
Clay content: 28 to 35 percent
Pararock fragment: 0 to 25 percent weakly cemented siltstone paragravels

Oi horizon:
Value: 2 or 3, 5 or 6 dry
Chroma: 1 or 2, moist or dry
Pararock fragments: 0 to 5 percent siltstone paragravels
Reaction: strongly acid to neutral

A horizon:
Hue: 10YR or 2.5Y
Value: 2 or 3, 5 or 6 dry
Chroma: 2 to 3, moist or dry
Texture of fine earth: silt loam, silty clay loam
Pararock fragments: 0 to 15 percent siltstone paragravels
Clay content: 22 to 30 percent
Reaction: strongly acid to neutral

Bt horizon:
Hue: 10YR and 2.5Y, moist and dry
Value: 4 or 5 moist, 5 to 7 dry
Chroma: 3 or 4 moist, 2 or 3 dry
Texture of fine earth: silt loam, silty clay loam, and clay loam
Pararock fragments: 0 to 59 percent siltstone paragravels
Clay content: 22 to 40 percent
Reaction: strongly acid to slightly acid

Redoximorphic Features: fine and medium iron-manganese masses in the matrix
Quantity: common to many
Hue: 10YR
Value: 4 or 5
Chroma: 4 or 6

Redoximorphic Features: fine and medium iron depletions in the matrix
Quantity: common to many
Hue: 10YR, 2.5Y
Value: 4 to 6
Chroma: 1 or 2

Btg horizon:
Hue: 10YR and 2.5Y, moist and dry
Value: 4 or 5, 5 to 7 dry
Chroma: 1 or 2 moist or dry
Texture of fine earth: silt loam, silty clay loam, and clay loam
Pararock fragments: 0 to 59 percent siltstone paragravels
Clay content: 25 to 40 percent
Reaction: strongly acid to slightly acid

Redoximorphic Features: fine and medium iron-manganese masses in the matrix
Quantity: common to many
Hue: 7.5YR, 10YR
Value: 4 or 5
Chroma: 4 or 6

COMPETING SERIES: There are no other series in this family.

GEOGRAPHIC SETTING: Salmoncreek soils are on broad summits, ridges, and mountain slopes. Slopes are 2 to 50 percent. Elevations are 50 to 500 meters. These soils formed in colluvium and residuum from interbedded siltstone, fine-grained sandstone, and mudstone. The climate is humid with cool, foggy summers and cool, wet winters. Mean annual precipitation is 890 to 2030 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 275 to 330 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Redcrest (T,) Rootcreek (T) soils. Redcrest soils have redoximorphic features beginning below 100 centimeters. Rootcreek soils have 24 to 35 percent clay and redoximorphic features starting between 50 and 100 centimeters below the mineral soil surface. Redcrest soils occur on mountain slopes on inclusions of weakly to moderately cemented siltstone and fine-grained sandstone

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: somewhat poorly drained, very high runoff, and moderately low 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, red alder, grand fir, California hazel, California huckleberry, salal, western swordfern, and thimbleberry.

DISTRIBUTION AND EXTENT: California Coastal Redwood Belt; MLRA 4. The series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Humboldt County, California, 2016; Proposed 2005. Name is from Salmon Creek, a tributary to Humboldt Bay south of Eureka.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

1. Ochric epipedon - the zone from 0 to 22 centimeters (Oi and A horizon).
2. Argillic horizon - the zone from 56 to 200 centimeters averages 34 percent clay and 4 percent fine sand or coarser.(Bt2, Bt3, Btg1 and Btg2 horizons).
3. Particle-size control section - the zone from 56 to 106 centimeters (Bt1, Bt2 and Bt3 horizons)

ADDITIONAL DATA: NSSL Pedon number 060222
NASIS User Pedon ID: 03CA600087

Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.