LOCATION YAGERCREEK CA

Established Series
Rev. JTB/SAA/ET
08/2016

YAGERCREEK SERIES

The Yagercreek series consists of very deep, well drained soils formed in colluvium and residuum from sandstone and mudstone. Yagercreek soils are on mountains and slopes range from 15 to 75 percent. The mean annual precipitation is about 1520 millimeters and the mean annual air temperature is about 11 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, isomesic Dystric Eutrudepts

TYPICAL PEDON: Yagercreek on a southeast facing slope of 60 percent under a canopy of redwood, tanoak, and evergreen huckleberry. (Colors are for moist soil unless otherwise stated.) When described on September 30, 2002 the soil was dry to 100 centimeters.

Oi--0 to 5 centimeters; slightly decomposed plant material; dark brown (7.5YR 3/2) rubbed; 90 percent fibers, 50 percent rubbed; moderately acid (pH 6.0); abrupt wavy boundary.

Oe--5 to 10 centimeters; moderately decomposed plant material; black (10YR 2/1) rubbed and unrubbed, 60 percent fiber, 30 percent rubbed; 10 percent gravel; slightly acid (pH 6.4); abrupt wavy boundary. (Combined thickness of the O horizons is 0 to 10 centimeters)

A--10 to 30 centimeters; very dark grayish brown (10YR 3/2) gravelly silt loam, grayish brown (10YR 5/2) dry; moderate fine and very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, fine, medium, and common coarse and very coarse roots throughout; common very fine, fine, and few medium tubular pores; 20 percent gravel; neutral (pH 6.8); clear wavy boundary. (5 to 50 centimeters thick)

AB--30 to 50 centimeters; dark yellowish brown (10YR 4/4) gravelly loam, yellowish brown (10YR 5/4) dry; moderate fine subangular and very fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, fine, medium, and common coarse and very coarse roots throughout; few very fine, fine, and common medium tubular pores;; 35 percent gravel; neutral (pH 6.8); clear wavy boundary.)

Bt1--50 to 95 centimeters; yellowish brown (10YR 5/6) very gravelly loam, brownish yellow (10YR 6/6) dry; moderate very fine and fine subangular blocky structure; moderately hard, friable, moderately sticky and moderately plastic; many very fine, fine, medium, and common coarse and very coarse roots throughout; common very fine, fine, and common coarse tubular pores; few distinct clay films on all faces of peds and few prominent clay films on fragments; 35 percent gravel, 5 percent cobbles, and 2 percent stones; neutral (pH 6.6); gradual wavy boundary. (0 to 91 centimeters thick)

Bt2--95 to 140 centimeters; light olive brown (2.5Y 5/4) very gravelly clay loam, light yellowish brown (2.5Y 6/4) dry; moderate very fine and fine subangular blocky structure; moderately hard, friable, moderately sticky and very plastic; few fine and common medium, coarse, and very coarse roots throughout; few very fine and fine tubular pores; common distinct clay films on all faces of peds and common prominent clay films on fragments; 35 percent gravel; slightly acid (pH 6.3); gradual wavy boundary. (0 to 40 centimeters thick)

Bt3--140 to 180 centimeters; light olive brown (2.5Y 5/4) extremely gravelly clay loam, light yellowish brown (2.5Y 6/4) dry; weak very fine subangular blocky structure; moderately hard, friable, moderately sticky and very plastic; few fine, medium ,and common coarse and very coarse roots throughout; few very fine and fine tubular pores; common prominent clay films on all faces of peds, and common prominent clay films on rock fragments; 56 percent gravel, 10 percent cobbles, and 2 percent stones; slightly acid (pH 6.4) gradual wavy boundary. (0 to 40 centimeters thick)

Bt4--180 to 200 centimeters; light olive brown (2.5Y 5/4) extremely gravelly clay loam, light yellowish brown (2.5Y 6/4) dry; weak fine subangular blocky structure; hard, friable, moderately sticky and very plastic; few fine, common medium, and common coarse roots throughout; few very fine and fine tubular pores; common prominent clay films on all faces of peds, and common prominent clay films on rock fragments; 40 percent gravel, 10 percent cobbles, and 5 percent stones; slightly acid acid (pH 6.4). (0 to 50 centimeters thick)

TYPE LOCATION: Humboldt County, California in the northeast quarter of the northwest quarter, section 13, T. 1 S., R. 2 E., HB&M; USGS Redcrest Quadrangle; WGS84 Decimal degrees 40.3855556 latitude and -123.9030556 longitude, UTM 423349mE 4470947mN, 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 soil moisture regime.

Soil Temperature: The mean annual soil temperature at 50 centimeters is 10 to 12 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: Less than 35 percent by sum of cations at 125cm below the upper boundary of the argillic horizon.

Organic matter: Greater than 0.9 percent organic carbon in the upper 15 centimeters of the argillic horizon.

Particle size control section (weighted average):
Pararock fragments: 0 to 35 percent moderately cemented paragravels
Rock fragments: 35 to 75 percent strongly cemented gravel, 0 to 35 percent strongly cemented cobble and stones
Clay content: 24 to 35 percent

A horizon
Hue: 10YR
Value: 2 to 4 moist, 4 to 6 dry
Chroma: 2 to 3, moist or dry
Texture of fine earth: loam, or silt loam
Pararock fragments: 0 to 15 percent paragravel
Rock fragments: 15 to 60 percent gravel; 0 to 35 percent cobbles and stones
Clay content: 15 to 27 percent
Reaction: moderately acid to neutral

Some pedons have an AB or ABt horizon

Upper Bt horizon
Hue: 7.5YR, 10YR and 2.5Y, moist or dry
Value: 4 or 5 moist, 5 to 7 dry
Chroma: 2 to 4 moist or dry
Texture of fine earth: loam, clay loam
Pararock fragments: 0 to 35 percent moderately cemented mudstone paragravel
Rock fragments: 35 to 60 percent strongly cemented sandstone gravel and 0 to 35 percent strongly cemented sandstone cobbles and stones
Clay content: 15 to 30 percent
Reaction: moderately acid to slightly acid

Lower Bt horizon
Hue: 7.5YR, 10YR and 2.5Y, moist or dry
Value: 4 or 5, 5 to 7 dry
Chroma: 2 to 6 moist or dry
Texture of fine earth: loam, clay loam, sandy clay loam
Pararock fragments: 0 to 35 percent moderately cemented mudstone
Rock fragments: 35 to 90 percent strongly cemented sandstone gravel and 0 to 35 percent strongly cemented sandstone cobbles and stones
Clay content: 22 to 38 percent
Reaction: strongly to slightly acid

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

GEOGRAPHIC SETTING: Yagercreek soils are on mountain slopes. Slopes are 15 to 75 percent. Elevations are 60 to 1150 meters. These soils formed in colluvium and residuum from interbedded and sandstone, mudstone. The climate is humid with cool, foggy summers and cool, wet winters. Mean annual precipitation is 1015 to 2160 millimeters. Mean January temperature is about 8 degrees C, mean July temperature is about 13 degrees C, and the mean annual temperature is 9 to 11 degrees C. Frost free season is about 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mailridge, Mountbaldy, and Redwoodhouse soils. Mailridge and Redwoodhouse have a 20 percent increase in clay within 30 centimeters of the eluvial horizon and C horizons with less than 22 percent clay between 100 and 150 centimeters. Mountbaldy soils are less than 100 centimeters to a lithic contact. Redwoodhouse soils have less than 35 percent rock fragments in the particle size control section. Mailridge and Mountbaldy soils are on convex ridge and bench shoulder positions. Redwoodhouse soils are on mountain slope positions dominated by moderately cemented mudstone.

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, and watershed. Natural vegetation includes coast redwood, Douglas-fir, tan oak, California huckleberry, salal, western swordfern.

DISTRIBUTION AND EXTENT: 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, 2011. The name is from Yager Creek.

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

1. Ochric epipedon - the zone from 0 to 30 centimeters (A horizons).
2. Cambic horizon - the zone from 30 to 200 centimeters (AB, Bt1, Bt2, Bt3, Bt4 horizons).
3. Particle-size control section - the zone from 25 to 100 centimeters averages 20 percent clay by weight and 39 percent rock fragments by volume. (A, AB, Bt1, and Bt2 horizons)
4. Dystric Eutrudepts subgroup: no free carbonates within 100 centimeters

ADDITIONAL DATA: National Soil Survey Laboratory Pedon No. 03N0870; NASIS User Pedon ID 02CA601094

Keys to Soil Taxonomy, 12th edition.

National Cooperative Soil Survey
U.S.A.