LOCATION EZBIN                   ID

Established Series
Rev. KWH/GAH
02/2011

EZBIN SERIES

The Ezbin series consists of very deep, well drained soils formed in extrusive igneous rocks. Ezbin soils are on mountains and have slopes of 4 to 60 percent. The mean annual precipitation is about 530 mm. and the mean annual temperature is about 2.2 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Typic Argicryolls

TYPICAL PEDON: Ezbin loam - on a 45 percent northeast-facing slope at 1,890 meters, forested. (Colors are for dry soil unless otherwise noted. When described on November 7, 1979, the soil was frozen to 13 cm and moist throughout.) The surface is covered with 10 percent gravel and 3 percent stones.

Oi--0 to 2 cm; slightly decomposed needles, twigs, leaves, and grass. (1 to 3 cm thick)

Oe--2 to 5 cm; moderately decomposed needles, twigs, leaves, and grass. (1 to 5 cm thick)

A--5 to 33 cm; brown (10YR 4/3) loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure parting to moderate very fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and few fine, medium and coarse roots; many very fine and fine irregular pores; 5 percent gravel; neutral (pH 6.8); clear wavy boundary. (7 to 41 cm thick)

Bt1--33 to 55 cm; yellowish brown (10YR 5/4) very gravelly clay loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium prismatic structure parting to moderate very fine and fine subangular blocky; slightly hard, firm, moderately sticky and moderately plastic; common very fine and fine, and few medium and coarse roots; common very fine and fine tubular pores; common distinct clay films lining pores and on faces of peds; 25 percent gravel, 10 percent cobbles; neutral (pH 7.0); gradual wavy boundary.

Bt2--55 to 81 cm; yellowish brown (10YR 5/4) very stony clay loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium prismatic structure parting to moderate very fine and fine subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; common very fine and few fine, medium and coarse roots; common very fine and fine tubular pores; common distinct clay films lining pores and on faces of peds; 25 percent gravel, 10 percent cobbles, 10 percent stones; neutral (pH 7.2); gradual wavy boundary.

Bt3--81 to 132 cm; yellowish brown (10YR 5/4) very stony loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium prismatic structure parting to moderate very fine and fine subangular blocky; slightly hard, friable, slightly sticky and moderately plastic; common very fine and few fine, medium and coarse roots; common very fine and fine tubular pores; common faint clay films lining pores and on faces of peds; 15 percent gravel, 20 percent cobbles, 15 percent stones; neutral (pH 7.2); gradual wavy boundary. (Combined thickness of the Bt horizons is 81 to 127 cm)

BC--132 to 157 cm; yellowish brown (10YR 5/4) extremely stony loam, dark yellowish brown (10YR 4/4) moist; moderate very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; few fine and medium roots; common very fine and fine tubular pores; 15 percent gravel, 20 percent cobbles, 30 percent stones; neutral (pH 7.2).

TYPE LOCATION: Lemhi County, Idaho; Cabin Creek drainage; about 20 kilometers north of Ellis, Idaho; located about 436 meters north and 750 meters west of the southeast corner of sec 19, T. 18 N., R. 21 E.; Hat Creek USGS topographic quadrangle; lat. 44 degrees 52 minutes 18.1 seconds N. and long. 114 degrees 01 minute 30.4 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:

Mean annual soil temperature: 2.2 to 4.8 degrees C.
Mean summer soil temperature: 5.0 to 8.0 degrees C.
Soil moisture regime: udic
Mollic epipedon: 25 to 40 cm thick
Control section average clay: 27 to 35 percent
Control section average rock fragments: 35 to 50 percent
Reaction of profile: slightly acid or neutral

A horizon
Value: 3 to 5 dry, 2 or 3 moist
Chroma: 1 to 3, dry or moist

Bt horizon
Hue: 7.5YR or 10YR, dry or moist
Value: 5 to 7 dry, 3 to 5 moist
Chroma: 3 or 4, dry, 2 to 4 moist
Texture: GRV-CL, CBV-L, GR-CL, CB-CL, STV-CL and STV-L

BC horizon (when present)
Hue: 7.5YR or 10YR, dry or moist
Value: 5 to7 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: STX-L, GRX-L, GRV-FSL, GRX-LS
Total rock fragments: 50 to 80 percent

COMPETING SERIES: These are the Elwood, Quazar, Tahquats and Wander series. Elwood soils are moderately deep. Quazar soils do not have an organic surface layer. Tahquats soils have mean summer soil temperature greater than 12 degrees C. and do not have an organic surface layer. Wander soils have a mean summer soil temperature greater than 10 degrees C. and do not have an organic surface layer.


GEOGRAPHIC SETTING:
Landscape: mountains
Landform: mountain slopes
Elevation: 1,797 to 2,438 meters
Slope: 4 to 60 percent
Parent material: colluvium from extrusive igneous rocks
Mean annual air temperature: 1.7 to 4.4 degrees C.
Mean annual precipitation: 450 to 914 mm
Frost free period: 30 to 60 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Custco, Dawtonia, Gaciba, Klug, Lag, Resoot, and Zeebar soils. Custco and Dawtonia are on mountain slopes and hillslopes and have ochric epipedons. Gaciba soils are on mountain slopes and hillslopes and are shallow to a lithic contact. Klug, Resoot, and Zeebar soils are on mountain slopes and lack O horizons.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Well
Runoff: medium
Saturated hydraulic conductivity: moderately slow

USE AND VEGETATION:
Major uses: timber production and some livestock grazing
Dominant native vegetation: Douglas-fir, pine reedgrass, Idaho fescue and mountain snowberry

DISTRIBUTION AND EXTENT:
Distribution: East-central Idaho; MLRA 12 and 43B.
Extent: these soils are not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Lemhi County, Idaho, 1999.

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

Mollic epipedon: from 5 to 33 cm

Argillic horizon: from 33 to 132 cm

Particle size control section: from 33 to 83 cm
Soil temperature regime: Cryic
Soil moisture regime: Udic

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National Cooperative Soil Survey
U.S.A.