LOCATION EZBIN IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Xeric Argicryolls
TYPICAL PEDON: Ezbin very stony loam - on a 45 percent northeast-facing slope at 6,200 feet, forested. (Colors are for dry soil unless otherwise noted. When described on November 7, 1979, the soil was frozen to 5 inches and moist throughout.)
Oi--0 to 1 inch; slightly decomposed needles, twigs, leaves, and grass. (0.5 to 1 inch thick)
Oe--1 to 2 inches; moderately decomposed needles, twigs, leaves, and grass. (0.5 to 2 inches thick)
A--2 to 13 inches; brown (10YR 4/3) very stony 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 interstitial pores; 5 percent pebbles, 3 percent stones; neutral (pH 6.8); clear wavy boundary. (10 to 16 inches thick)
Bt1--13 to 22 inches; 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 pebbles, 10 percent cobbles; neutral (pH 7.0); gradual wavy boundary. (5 to 12 inches thick)
Bt2--22 to 32 inches; yellowish brown (10YR 5/4) very gravelly 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 pebbles, 10 percent cobbles, 10 percent stones; neutral (pH 7.2); gradual wavy boundary. (5 to 15 inches thick)
Bt3--32 to 52 inches; yellowish brown (10YR 5/4) very cobbly 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 pebbles, 20 percent cobbles, 15 percent stones; neutral (pH 7.2); gradual wavy boundary. (15 to 25 inches thick)
BC--52 to 62 inches; 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 pebbles, 20 percent cobbles, 30 percent stones; neutral (pH 7.2).
TYPE LOCATION: Lemhi County, Idaho; Cabin Creek drainage; about 2,700 feet east and 110 feet north of the southwest corner of sec. 19, T. 18 N., R. 20 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 36 to 40 degrees F.
Average summer soil temperature - 45 to 47 degrees F.
Mollic epipedon - 10 to 16 inches thick
Control section - percent clay 27 to 33
Coarse fragments - 35 to 50 percent
Reaction of profile - slightly acid or neutral
A horizon
Value - 3 through 5 dry, and 2 or 3 moist
Chroma - 1 through 3, dry or moist
Bt horizon
Hue - 7.5YR or 10YR, dry or moist
Value - 5 through 7 dry, 3 through 5 moist
Chroma - 3 or 4, dry or moist
Texture - GRV-CL, CBV-L, GR-CL, and CB-CL
BC horizon
Hue - 7.5YR or 10YR, dry or moist
Value - 5 through 7 dry, 3 or 4 moist
Chroma - 3 or 4, dry or moist
Texture - STX-L, GRX-L, GRV-FSL, GRX-LS
Rock fragments - 50 to 80 percent
COMPETING SERIES: These are the Blaine, Bowen, Buena Vista, Chamberlain, Elwood, Ess, Fornor (T), Forsey (T), Fourme, Geertson, Forsey, Fourmile, Geertsen, Libeg, Hoodle, Latigo (T), Nathrop, Norriston, Nurkey, Packer, Parkview, Quander, Sedgway (T), Tahquats, Teeler (T), Thiel, Winada, Woodhall, and Zeebar series. The Blaine, Bowen, Buena Vista, Elwood, Nathrop, Parkview, Winada, and Woodhall soils are 20 to 40 inches deep over a lithic or paralithic contact. Chamberlain soils have lime and silica cementation in the lower B horizon. Fornor soils have a Bt horizon that is 9-16 inches thick. Forsey and Teeler soils have a soil temperature warmer than 40 degrees F. Fourme soils are moderately deep to a coarse textured "C". Geertsen, Hoodle, Latigo, Nurkey, Teeler and Thiel soils have a layer of carbonate accumulation. Quander soils have calcareous substratums at a depth of 40 to 60 inches or more and have cobbly argillic horizons. Packer soils have greater than 60 percent coarse fragments in the argillic horizon and the argillic horizon is in a lithologic discontinuity. Libeg and Tauqhats soils have slightly acid to moderately acid reaction classes. Norriston soils have layers of very gravelly sand or coarse sand below 20 inches. Sedgway soils have an "E" horizon. Zeebar soils lack O horizons and are dry in moisture control section for 30 to 60 consecutive days in late summer.
GEOGRAPHIC SETTING: Ezbin soils are on mountains and have slopes of 15 to 60 percent. Elevations are 6,500 to 8,000 feet. The soils formed in slope alluvium from extrusive igneous rocks. The climate is cold and moist in winter and cool and dry in summer. Average annual precipitation is 18 to 25 inches. Average summer temperature is 45 to 47 degrees F and the average annual temperature is 35 to 38 degrees F. Frost-free period is 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Custco, Dawtonia, Gaciba, Klug, Lag, Resoot, and Zeebar soils. Custco and Dawtonia are on mountains and foothills and have ochric epipedons. Gaciba soils are on mountains and foothills and are shallow to a lithic contact. Klug, Resoot, and Zeebar soils are on mountains and lack O horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for timber production. Vegetation is mainly Douglas-fir, pine reedgrass, Idaho fescue, and mountain snowberry.
DISTRIBUTION AND EXTENT: East-central Idaho; MLRA 43. These soils are not extensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lemhi County, Idaho, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 2 to 13 inches (A horizon)
Argillic horizon - The zone from 13 to 52 inches (Bt1, Bt2, and Bt3 horizons)
Particle-control section - the zone from 13 to 33 inches (Bt1, Bt2, and part of Bt3 horizons)