LOCATION ZEEBAR IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Xeric Argicryolls
TYPICAL PEDON: Zeebar gravelly loam - on a west-facing mountain slope of 15 percent on rangeland at 7,000 feet elevation. When described on September 12, 1977, the soil was air-dry throughout. Colors are for air-dry soil unless otherwise stated.
A--0 to 8 inches; dark brown (10YR 3/3) gravelly loam, very dark brown (10YR 2/2) moist; weak very fine subangular blocky structure; slightly hard, very friable; slightly sticky and slightly plastic; many very fine and fine roots; many very fine and common fine tubular pores; 20 percent gravel; neutral (pH 6.6); clear wavy boundary. (6 to 13 inches thick)
Bt1--8 to 14 inches; dark yellowish brown (10YR 4/4) very gravelly loam, dark brown (10YR 3/3) moist; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine and few medium roots; common very fine and fine tubular pores; common faint clay films lining pores and on faces of peds; 35 percent gravel and 5 percent cobbles; neutral (pH 6.6); gradual wavy boundary.
Bt2--14 to 22 inches; yellowish brown (10YR 5/4) very gravelly loam, dark yellowish brown (10YR 4/4) moist; moderate fine prismatic structure parting to moderate fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine and few medium roots; common very fine and fine tubular pores; common faint clay films lining pores and on faces of peds; 35 percent gravel and 10 percent cobbles; neutral (pH 6.7); gradual wavy boundary.
Bt3t--22 to 35 inches; light olive brown (2.5Y 5/4) very gravelly sandy clay loam, brown (10YR 4/3) moist; moderate fine and medium prismatic structure; hard, firm, moderately sticky and moderately plastic; common very fine roots; common very fine and fine tubular pores; common distinct clay films lining pores and on faces of peds; 25 percent gravel and 20 percent cobbles; neutral (pH 6.9); gradual wavy boundary.
Bt4--35 to 49 inches; light olive brown (2.5Y 5/4) extremely gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine and fine tubular pores; common faint and few distinct clay films lining pores and on faces of peds; 35 percent gravel and 25 percent cobbles; neutral (pH 7.2); gradual wavy boundary. (Combined thickness of the Bt horizons is 35 to 50 inches.)
C--49 to 60 inches; light olive brown (2.5Y 5/4) extremely gravelly sandy clay loam; dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine tubular pores; 40 percent gravel and 30 percent cobbles; slightly alkaline (pH 7.4).
TYPE LOCATION: Custer County, Idaho; about 600 feet north and 1,200 feet east of the southwest corner, sec. 10 T. 10 N., R. 20 E.(Latitude 44 degrees, 12 minutes, 20 second N., Longitude 114 degrees, 06 minutes, 18 seconds W.)
RANGE IN CHARACTERISTICS:
Mollic epipedon - 10 to 16 inches thick
Reaction - neutral or slightly alkaline
Soil moisture - dry for 60 to 90 consecutive days during the four months following the summer solstice (xeric)
Soil temperature - mean annual soil temperature is 37 to 42 degrees F., mean summer soil temperature is 50 to 59 degrees F.
Particle-size control section:
Clay - 18 to 35 percent
Rock fragments 40 to 75 total with 35 to 65 gravel, 5 to 35 cobbles
A horizon:
Hue - 7.5YR or 10YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 1 to 3 dry or moist
Bt horizon:
Hue - 5YR to 7.5YR, 10YR
Value - 4 to 6 dry, 3 to 5 moist
Chroma - 2 to 4 dry or moist
Texture - loam, sandy clay loam, or clay loam
Rock fragments - 40 to 80 percent total, 35 to 65 percent gravel, 5 to 30 percent cobbles, 0 to 5 percent stones
C horizon (absent in some pedons):
Hue, moist - 2.5Y, 7.5YR, or 10YR
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 to 4 dry
Texture - loam, sandy clay loam, or sandy loam
Rock fragments - 45 to 90 percent total, 40 to 75 percent gravel, 5 to 35 percent cobbles, 0 to 5 percent stones
COMPETING SERIES: These are the, Bullville, Chamberlain, Cowlow, Crandall, Ezbin, Forsey, Fourme, Itwo, Jackflat, Packer, Scuffe (T), Stopatoe (T), Tagum (T), Toquima, and Winada series. Bullville, Cowlow, Itwo, Scuffe, Stopatoe, Tagum (T), Toquima, and Winada soils have lithic or paralithic contact at depths shallower than 40 inches. Crandall soils have a lithic contact at 40 to 60 inches. Chamberlain soils have a layer of carbonate accumulation below the argillic horizon. Ezbin soils have O horizons and have an average summer soil temperature of 45 to 47 degrees F. Forsey soils have average annual soil temperatures of 40 to 44 degrees F. Fourme soils are dry for 45 to 60 consecutive days following the summer solstice. Jackflat soils have a paralithic contact at 40 to 60 inches. Packer soils are less than 21 inches deep to the base of the argillic horizon.
GEOGRAPHIC SETTING: Zeebar soils are on ridges, mountains, foothills, and fan remnants. Slopes are 4 to 70 percent. Elevations are 5,000 to 9,000 feet. The soils formed in slope alluvium weathered from quartzite, basalt, or tuff. Some areas may be influenced by loess. The climate is cold and moist in winter and spring, and cool and dry in summer. The mean annual precipitation is 11 to 20 inches. Mean summer temperature is 48 to 57 degrees F; mean annual temperature is 35 to 40 degrees F. Frost-free period is 10 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dawtonia, Frailton, and Parkay soils. Dawtonia and Frailton soils lack mollic epipedons. Also, Frailton is shallow to a paralithic contact. Parkay soils has a mollic epipedon greater than 16 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: The soils are used dominantly for range. Vegetation is mainly three-tip sagebrush and Idaho fescue, mountain big sagebrush and Idaho fescue.
DISTRIBUTION AND EXTENT: East-central and southeastern Idaho. These soils are moderately extensive. MLRA 12 and 43B.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho, 1999.
REMARKS: Diagonostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from 0 to 14 inches thick (A and Bt1 horizons)
Argillic horizon - The zone from 8 to 49 inches (Bt1, Bt2, Bt3 and Bt4 horizons)
Particle-size control section - The zone from 8 to 28 inches (Bt1, Bt2, and upper Bt3 horizons)
Soil moisture regime - xeric