LOCATION TOEBRANCH IDInactive Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Cumulic Haploxerolls
TYPICAL PEDON: Toebranch loam, cropland - on a 1 percent slope at an elevation of 6,200 feet. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 6 inches; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; weak medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium roots; many very fine and fine irregular pores; neutral (pH 7.2); clear smooth boundary. (6 to 8 inches thick)
BA--6 to 16 inches; very dark grayish brown (10YR 3/2) clay loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; many fine and medium roots; common very fine and fine tubular pores; neutral (pH 7.2); gradual wavy boundary. (7 to 13 inches thick)
Bw1--16 to 25 inches; brown (7.5YR 5/2) clay loam, dark brown (7.5YR 3/2) moist; weak coarse subangular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium roots; common very fine and fine tubular pores; few faint clay films on faces of peds; slightly alkaline (pH 7.4); clear wavy boundary. (8 to 14 inches thick)
Bw2--25 to 36 inches; brown (7.5YR 5/3) silty clay loam, dark brown (7.5YR 3/2) moist; weak coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; common very fine and fine tubular pores; slightly alkaline (pH 7.4); clear wavy boundary. (7 to 12 inches thick)
BC--36 to 60 inches; brown (7.5YR 5/4) clay loam, brown (7.5YR 4/3) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; common very fine and fine tubular pores; slightly alkaline (pH 7.4).
TYPE LOCATION: Bear Lake County, Idaho; about 1,000 feet east and 600 feet north of the southwest corner of section 15, T. 12 S., R. 46 E. (Latitude 42 degrees 22 minutes 36 seconds N., Longitude 111 degrees 04 minutes 12 seconds W.)
RANGE IN CHARACTERISTICS:
Soil moisture control section - usually moist, dry in all parts for 45 consecutive days or more in the four months following the summer solstice. Xeric moisture regime.
Average annual soil temperature - 42 to 46 degrees F. Frigid soil temperature regime.
Mollic epipedon thickness - 29 to 47 inches.
Particle-size control section
Clay content - 18 to 28 percent
Rock fragments - 0 to 5 percent gravel
Ap horizon
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 2 or 3 dry or moist
Clay content: 12 to 18 percent
Rock fragments: 0 to 5 percent gravel
Reaction: neutral or slightly alkaline
BA horizon
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 2 or 3 dry or moist
Texture: clay loam, loam
Clay content: 18 to 28 percent
Rock fragments: 0 to 5 percent gravel
Reaction: neutral or slightly alkaline
Bw horizons
Hue: 7.5YR or 10YR
Value: 3 to 5 dry
Chroma: 2 or 3 dry or moist
Texture: clay loam, loam, silt loam, silty clay loam
Clay content: 18 to 28 percent
Rock fragments: 0 to 5 percent gravel
Reaction: neutral or slightly alkaline
BC horizon
Hue: 7.5YR or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4 dry or moist
Texture: clay loam, loam, silt loam
Clay content: 18 to 28 percent
Rock fragments: 0 to 5 percent gravel
Reaction: slightly alkaline to neutral
COMPETING SERIES: These are the Echocreek, Koosharem, Oakspring, Roschene, Toehead and Zola series. The Echocreek, Oakspring, Toehead and Zola soils have horizons of secondary carbonate accumulation. The Koosharem soils do not have Bw horizons. The Roschene soils are moderately well drained and have redox features at 30 to 60 inches.
GEOGRAPHIC SETTING:
Landform: stream terraces
Elevation: 6,100 to 6,300 feet
Slope: 0 to 2 percent
Parent material: mixed alluvium
Climate: long, cool winters; moist springs; dry, warm summers.
Average annual precipitation: 13 to 16 inches
Average annual temperature: 40 to 44 degrees F.
Frost-free season: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Thatcher and Thomasfork soils. Thatcher soils are fine-silty and have an argillic horizon on more convex positions on stream terraces. Thomasfork soils are fine family on lower stream terraces.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately slow permeability
USE AND VEGETATION: Mainly used for cropland and hayland. Typical crops are barley and wheat. Native vegetation includes basin big sagebrush, bluebunch wheatgrass, fescue, prairie junegrass, rabbit brush.
DISTRIBUTION AND EXTENT: Southeast Idaho. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Bear Lake County, Idaho, 1999. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon (Cumulic) - the zone from 0 to 36 inches. (Ap, BA, and Bw horizons)
Particle-size control section - the zone from 10 to 40 inches (part of BA, Bw1, Bw2 and part of BC horizon)