LOCATION JOEBALDY IDEstablished Series
TAXONOMIC CLASS: Medial-skeletal over fragmental or cindery, glassy over mixed Typic Fulvicryands
TYPICAL PEDON: Joebaldy stony medial silt loam, alpine grassland; on a south facing convex slope of 35 percent at 5400 feet elevation. When described on September 8, 1981, the soil was dry throughout. (Colors are for dry soil unless otherwise stated).
Oe--0 to 0.5 inch; slightly decomposed needles, leaves, and twigs mixed with Mt. St. Helens volcanic ash.
A1--0.5 to 3 inches; dark gray (10YR 4/1) stony medial silt loam, black (10YR 2/1) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and few medium roots; many very fine and fine tubular and irregular pores; 15 percent pebbles and 10 percent cobbles; about 0.1 percent of the surface is covered with stones; strongly acid (pH 5.5); clear wavy boundary. (3 to 8 inches thick)
A2--3 to 10 inches; dark grayish brown (10YR 4/2) stony medial silt loam, very dark brown (10YR 2/2) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and medium roots; many very fine and fine tubular and irregular pores; 15 percent pebbles, 5 percent cobbles, and 10 percent stones; strongly acid (pH 5.5); clear wavy boundary. (5 to 12 inches thick)
Bw1--10 to 17 inches; brown (10YR 5/3) very stony medial silt loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, fine, and few medium roots; common very fine and fine tubular and irregular pores; 15 percent pebbles, 10 percent cobbles, and 15 percent stones; moderately acid (pH 5.8); clear wavy boundary. (5 to 12 inches thick)
Bw2--17 to 28 inches; light yellowish brown (10YR 6/4) very stony medial silt loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular and irregular pores; 20 percent pebbles, 15 percent cobbles, and 20 percent stones; moderately acid (pH 6.0); abrupt wavy boundary. (7 to 12 inches thick)
2C--28 to 60 inches; 25 percent pebbles, 35 percent cobbles, and 40 percent stones with no fines in voids.
TYPE LOCATION: Benewah County, Idaho; about 0.75 miles south of Rochat Peak, about 1800 feet east and 2300 feet north of the southwest corner of section 25, T.47 N., R.1 W.
RANGE IN CHARACTERISTICS:
Umbric epipedon thickness - 12 to 20 inches
Depth to fragmental material - 20 to 40 inches
Solum thickness - 20 to 36 inches
Moisture control section - dry August (15 to 30 days) moist - September through July. Udic moisture regime
Average annual soil temperature - 38 to 40 degrees F
Average summer soil temperature - 44 to 47 degrees F with an O horizon
Volcanic ash mantle thickness - 20 to 36 inches
Volcanic glass content in the 0.02 to 2.0 mm fraction - 30 to 65 percent
Ammonium-oxalate extractable Al + 1/2 Fe - 2.0 to 4.0 percent Phosphate retention - 80 to 100 percent
15-bar water retention on air dried samples - 15 to 18 percent
A horizon
Value - 4 or 5 dry and 2 or 3 moist
Chroma - 1 or 2 dry or moist
Rock fragments - 15 to 30 percent
Bulk density - 0.65 to 0.85 g/cc
Base saturation - 2 to 20 percent
Reaction - strongly acid to moderately acid
Organic carbon content - 8 to 11 percent
Bw horizon
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - CBV-SIL, STV-SIL, CBX-SIL, STX-SIL, CBV-L, STV-L, CBX-L, STX-L
Rock fragments - 40 to 80 percent
Bulk density - 0.65 to 0.85 g/cc
Base saturation - 2 to 20 percent
Reaction - moderately acid or slightly acid
Organic carbon content - 1.5 to 7 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Joebaldy soils are on high elevation mountain ridges. Slopes range from 10 to 50 percent. These soils formed in material weathered from talus and colluvium from metasedimentary rock, with a thick mantle of volcanic ash. Elevations range from 5200 to 6300 feet. The average annual air temperature ranges from 38 to 42 degrees F, average annual precipitation is 45 to 55 inches, and frost-free season is from 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Buckhouse, Latour (T), and Vay soils. Buckhouse soils are ashy over loamy-skeletal and are on high elevation mountain slopes. Latour soils lack a fragmental horizon within the control section and are on high elevation mountain slopes. Vay soils are ashy over loamy-skeletal and are on high elevation mountain slopes.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability in the solum and very rapid in the substratum.
USE AND VEGETATION: These soils are used for wildlife habitat, recreation, and watershed. Potential natural vegetation is mainly common beargrass, big blueberry, common yarrow, Columbia brome, green fescue, sedges, and Sitka mountainash, with a few scattered whitebark pine.
DISTRIBUTION AND EXTENT: Northern Idaho. This soil is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Shoshone County, Idaho, 1993.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - the zone from the mineral soil surface to 17 inches (A and Bw1 horizons)
Cambic horizon - the zone from 17 to 28 inches (Bw2 horizon)
Volcanic ash mantle - the zone from the mineral soil surface to 28 inches (A and Bw horizons)
Particle-size control section - the zone from the mineral soil surface to 40 inches (A, Bw1, Bw2, and part of the 2C horizons)