LOCATION TENEB ID

Established Series
Rev. GAH-BDG-EMM
07/2013

TENEB SERIES

The Teneb series consists of very deep, poorly drained soils formed in mixed alluvium in drainageways on plateaus or in mountains. Permeability is moderately slow and slopes range from 0 to 3 percent. The average annual precipitation is about 36 inches and the average annual temperature is about 42 degrees F.

TAXONOMIC CLASS: Fine-silty, mixed, active, frigid Aquandic Epiaqualfs

TYPICAL PEDON: Teneb ashy silt loam - in native pasture at 3,200 feet elevation. When described on July 19, 1993 the profile was moist throughout. (Colors are for dry soil unless otherwise noted).

A--0 to 2 inches; dark brown (10YR 3/3) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine, common fine and few medium roots; many very fine and fine, and few medium irregular pores; slightly acid (pH 6.2); abrupt smooth boundary. (3 to 23 inches thick)

AB--2 to 7 inches; dark grayish brown (10YR 4/2) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine subangular blocky structure parting to strong very fine and fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; common very fine and fine irregular pores; few fine prominent, dark brown (7.5YR 3/3) moist redox concentrations; moderately acid (pH 5.8); clear smooth boundary. (0 to 7 inches thick)

Bg--7 to 15 inches; grayish brown (10YR 5/2) silty clay loam, dark gray (2.5Y 4/1) moist; strong very fine and fine subangular blocky structure; very hard, friable, moderately sticky and moderately plastic; many very fine roots; common very fine and fine tubular and irregular pores; many fine and medium prominent dark yellowish brown (10YR 4/6) moist redox concentrations in interior of peds; strongly acid (pH 5.2); clear wavy boundary. (8 to 10 inches thick)

Btg--15 to 24 inches; light brownish gray (10YR 6/2) silty clay loam, dark gray (10YR 4/1) moist; moderate very fine and fine subangular blocky structure; very hard, friable, moderately sticky and moderately plastic; common very fine roots; common very fine, fine and medium tubular, and common very fine irregular pores; many fine prominent strong brown (7.5YR 5/6) moist redox concentrations; few faint clay films lining pores and on faces of peds; very strongly acid (pH 5.0); abrupt wavy boundary. (7 to 57 inches thick)

EB--24 to 27 inches; very pale brown (10YR 7/3) silt loam, brown (10YR 5/3) moist; weak very fine and fine subangular blocky structure; very hard, very firm, slightly sticky and slightly plastic; common very fine roots; common very fine and fine tubular, and few very fine irregular pores; common fine prominent brown (7.5YR 4/4) moist redox concentrations; few faint clay films lining pores and on faces of peds; very strongly acid (pH 4.9); abrupt wavy boundary. (0 to 10 inches thick)

BE--27 to 34 inches; pale brown (10YR 6/3) silt loam, yellowish brown (10YR 5/4) moist; moderate very coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; few very fine roots confined to ped faces; many very fine tubular and common very fine irregular pores; many fine and medium prominent strong brown (7.5YR 5/6) moist redox concentrations in interiors of peds; many distinct very pale brown (10YR 7/3) uncoated skeletans coating clay films lining pores and on faces of peds; very strongly acid (pH 4.8); gradual wavy boundary. (0 to 9 inches thick)

Btb1--34 to 49 inches; pale brown (10YR 6/3) silty clay loam, grayish brown (10YR 5/2) moist; weak very coarse prismatic structure; very hard, firm, moderately sticky and moderately plastic; few very fine roots confined to ped faces; common very fine tubular, common very fine and fine, and few medium irregular pores; many prominent strong brown (7.5YR 5/6) moist redox concentrations in interiors of peds; many distint brown (10YR 4/3) clay films lining pores and on faces of peds; 10 percent fine gravel in pockets and lenses; strongly acid (pH 5.2); abrupt wavy boundary. (0 to 15 inches thick)

Btb2--49 to 64 inches; brown (7.5YR 4/4) clay loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine tubular and irregular pores; common fine prominent gray (N 5/ ) moist redox depletions; common distinct gray (5Y 6/1) clay films lining pores and on faces of peds; 10 percent distinct black (10YR 2/1) iron-manganese stains lining pores and on faces of peds; 10 percent fine gravel; strongly acid (pH 5.2).

TYPE LOCATION: Clearwater County, Idaho; about 7 miles north and 1 mile west of Weippe, Idaho; about 2,200 feet south and 2,600 feet east of the northwest corner of sec. 9, T 36 N, R 4 E; Latitude - 46 degrees, 28 minutes, 42 seconds North; Longitude - 115 degrees, 57 minutes, 44 seconds West. USGS Weippe North quadrangle.

RANGE IN CHARACTERISTICS:

Average annual soil temperature - 39 to 45 degrees F. (Frigid temperature regime)
Volcanic glass content in the 0.02 to 2.0 mm fraction - 5 to 20 percent
Acid-oxalate extractable Al + 1/2 Fe - 0.4 to 0.9

A and AB horizons
Hue - 7.5YR or 10YR moist
Value - 3 to 7 dry, 2 to 4 moist
Chroma - 2 or 3 dry, 1 to 3 moist
Texture - ashy-loam or ashy-silt loam
Clay content - 16 to 25 percent
Reaction - strongly acid to slightly acid

Bg and Btg horizons
Hue - 7.5YR to 5Y dry or moist
Value - 5 to 7 dry, 3 to 6 moist
Chroma - 1 to 3 dry, 1 to 6 moist
Texture - silt loam, silty clay loam, clay loam, sandy clay loam or silty clay
Clay content - 18 to 50 percent (weighted average in particle-size control section is less than 35 percent)
Reaction - very strongly acid to moderately acid

EB and BE horizons
Hue - 7.5YR to 5GY dry or moist
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 or 3 dry, 1 to 6 moist
Texture - silt loam, silty clay loam or loam
Clay content - 22 to 29 percent
Rock fragment content - 0 to 5 percent
Reaction - Very strongly acid to slightly acid

Btb horizons
Hue - 5YR to 5G dry or moist
Value - 4 to 7 dry, 2 to 5 moist
Chroma - 1 to 4 dry or moist
Texture - silt loam, loam, silty clay loam or clay loam
Clay content - 15 to 43 percent
Rock fragment content - 0 to 10 percent gravel
Mica content - 0 to 15 percent
Reaction - very strongly acid to slightly acid

Cg and C horizons (present in some pedons)
Hue - 10YR to 5GY
Value - 2 to 5 dry, 4 to 7 moist
Chroma - 1 to 2 dry or moist
Texture - loam, silty clay loam or coarse sandy loam
Clay content - 17 to 33 percent
Reaction - very strongly acid to slightly acid

COMPETING SERIES:

Porrett - has an albic horizon.

GEOGRAPHIC SETTING: Teneb soils are in drainageways on plateaus or in mountains at elevations of 1,600 to 3,500 feet. These soils formed in mixed alluvium. The slope range is 0 to 5 percent. The average annual temperature is 38 to 44 degrees F. The average annual precipitation is 25 to 50 inches and the frost free season is 50 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dowper, Elkridge, Grangemont, Kauder and Placer series. Dowper, Grangemont and Kauder soils are on hills, are well drained and have an ash mantle. Elkridge soils are on mountain and canyon side slopes, are skeletal and are well drained. Placer soils are on hills, are deep to bedrock and are well drained.

DRAINAGE AND PERMEABILITY: Poorly drained, Runoff is slow, permeability is moderately slow. A seasonally perched water table is present. Typically it occurs at 0 to 12 inches above the surface from November through June and 5 to 10 inches below the surface from October through July. An apparent water table is present. Typically it has a phreatic surface at 1 inch above the surface to 3 inches below the surface from November through June and 10 to 47 inches below the surface from July through October. Flooding ranges from none in August and September to frequent, long or very long flooding from January through May.

USE AND VEGETATION: Used mainly for livestock grazing and watershed. Native vegetation is rushes, sedges, common camas, black hawthorn and tufted hairgrass.

DISTRIBUTION AND EXTENT: North central Idaho; Teneb soils are not extensive. MLRA 43A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Clearwater County, Idaho, 2003.

REMARKS: Diagnostic horizons and other features recognized in this pedon are:

Ochric epipedon - The zone from the surface to 7 inches (A and AB horizons)

Argillic horizon - The zone from 15 to 64 inches (Btg, EB, BE, Btb1 and Btb2 horizons)

Particle size control section - The zone from 15 to 35 inches (Btg, EB, BE and part of the Btb1 horizon)

The ranges of values listed under the Range In Characteristics for the soil properties Volcanic glass content and Acid-oxalate Al+1/2 Fe are estimates only.

National Cooperative Soil Survey
U.S.A.