LOCATION ARAVETON IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Calcic Haploxerolls
TYPICAL PEDON: Araveton extremely stony loam, grassland; (Color is for air dry soil unless otherwise noted.)
A1--0 to 4 inches; dark grayish brown (10YR 4/2) extremely stony loam, very dark brown (10YR 2/2) moist; moderate very fine and fine granular structure; hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine irregular pores; 10 percent stones; neutral (pH 6.8); gradual smooth boundary. (3 to 7 inches thick)
A2--4 to 7 inches; dark grayish brown (10YR 4/2) grayish brown (10YR 5/2) crushed loam, very dark grayish brown (10YR 3/2) moist; moderately fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine tubular pores; 10 percent stones; neutral (pH 7.0); gradual smooth boundary. (3 to 7 inches thick)
Bw--7 to 16 inches; brown (10YR 5/3) stony loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine tubular pores; 15 percent stones; neutral (pH 7.0); clear wavy boundary. (7 to 19 inches thick)
Bk1--16 to 24 inches; pale brown (10YR 6/3) stony loam, dark brown (10YR 4/2) moist; weak medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine tubular pores; 20 percent angular rock fragments; strongly effervescent; common veins and coating of calcium; mildly alkaline (pH 7.6); clear wavy boundary. (6 to 12 inches thick)
Bk2--24 to 38 inches; pale brown (10YR 6/3) stony loam, brown (10YR 5/3) moist; massive; hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine and fine tubular pores; 25 percent angular rock fragments; violently effervescent; mildly alkaline (pH 7.8); gradual wavy boundary. (10 to 18 inches thick)
Bk3--38 to 52 inches; light gray (2.5Y 7/2) loam, grayish brown (2.5Y 5/2) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine tubular pores; 10 percent angular rock fragments; strongly effervescent; common veins and coatings of calcium carbonate; mildly alkaline (pH 7.6); clear wavy boundary. (3 to 20 inches thick)
Bk4--52 to 66 inches; very pale brown (10YR 7/3) very stony loam, brown (7.5YR 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; many very fine and fine tubular pores; 40 percent angular rock fragments; strongly effervescent; common lime veins; mildly alkaline (pH 7.6).
TYPE LOCATION: Bingham County, Idaho; about 15 mile southeast of Alridge; about 1,000 feet north and 900 feet east of the southwest corner of sec. 18, T.4 S., R.39 E.
RANGE IN CHARACTERISTICS:
Thickness of Mollic epipedon - 7 to 17 inches
Depth to secondary lime - 20 to 30 inches
Average annual soil temperature - 40 to 47 degrees F.
Particle size control section
Clay content - averages 18 to 26 percent
Rock fragment content - averages 5 to 30 percent
A horizons
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Reaction - neutral to mildly alkaline
Bw horizon
Value - 5 or 6 dry, 3 through 5 moist
Chroma - 2 or 3 dry or moist
Rock fragments - 5 to 20 percent
Reaction - neutral or mildly alkaline
Texture - SIL, L, ST-L
Bk horizons
Hue - 10YR or 2.5Y
Value - 5 through 8 dry, 4 through 7 moist
Chroma - 2 or 3 dry or moist
Rock fragments - 10 to 40 percent
Reaction - mildly to strongly alkaline
Texture - STV-L, CB-L, GR-L, SIL, L
Calcium carbonate equivalent - 15 to 35 percent
COMPETING SERIES: These are the Causey, Kerl, Picayune, and Reavis (T) soils. Causey and Picayune soils are less than 20 inches deep to secondary lime. Kerl soils lack a calcic horizon. Reavis soils have volcanic ash influence in the upper part and have very gravelly textures at 40 to 60 inches.
GEOGRAPHIC SETTING: Araveton soils are on fan terraces, basalt plains, foothills and mountain slopes. Slopes range from 4 to 60 percent. Elevations range from 4,500 to 6,500 feet. The soil formed in alluvium and colluvium with some loess from rhyolite or closely related rock. The average annual precipitation ranges from 13 to 16 inches including 4 to 6 feet of snowfall. The average annual air temperature is 38 to 45 degrees F and the frost free season is 80 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Swanner and Rexburg soils. Swanner soils are less than 20 inches deep to rhyolite bedrock. Rexburg soils have a silt loam control section containing less than 15 percent particles coarser than very fine sand.
DRAINAGE AND PERMEABILITY: Well drained; moderate to very rapid runoff; moderate permeability.
USE AND VEGETATION: Araveton soils are used for nonirrigated cropland and rangeland. Typical crops consist of small grains. The potential natural vegetation is threetip sagebrush, bluebunch wheatgrass and phlox.
DISTRIBUTION AND EXTENT: Southeastern Idaho. These soils are moderately extensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Bingham County, Idaho, 1972.
Remarks: Diagnostic features and horizons recognized in this pedon are:
Mollic epipedon - the zone from the surface to 7 inches (the A1 and A2 horizons)
Cambic horizon - the zone from 7 to 16 inches (the Bw horizon)
Calcic horizon - the zone from 16 to 60 inches (the Bk1, Bk2, Bk3 and Bk4 horizons)
Particle-size control section - 10 to 40 inches (part of the Bw horizon, the Bk1, Bk2, and part of the Bk3 horizons)