LOCATION TANEY IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Vitrandic Argixerolls
TYPICAL PEDON: Taney ashy silt loam, forested; on an 8 percent northwest-facing slope at 2,760 feet elevation. Pedon initially described on August 13, 1965, and was redescribed on July 18, 2002. When redescribed, the soil was dry to 10 inches and slightly moist from 10 to 60 inches. (Colors are for moist soil unless otherwise noted.)
Oi-- 0 to 1 inch; slightly decomposed needles, twigs, leaves, bark and cones.
Oe-- 1 to 2 inches; moderately decomposed organic matter mixed with 1980 Mt. St. Helens volcanic ash
A-- 2 to 4 inches; very dark gray (10YR 3/1) ashy silt loam, grayish brown (10YR 5/2) dry; weak fine subangular blocky structure parting to moderate very fine and fine granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, common medium and few coarse roots; many very fine tubular pores; neutral (pH 7.3); clear wavy boundary. (2 to 9 inches thick)
BA-- 4 to 15 inches; very dark grayish brown (10YR 3/2) ashy silt loam, brown (10YR 5/3) dry; weak and moderate fine and medium subangular blocky structure; slightly hard, friable; slightly sticky and slightly plastic; many very fine, fine, common medium and few coarse roots; many very fine and few medium tubular pores; slightly acid (pH 6.5); gradual wavy boundary. (4 to 11 inches thick)
Bw-- 15 to 22 inches; dark brown (10YR 3/3) silt loam, brown (10YR 5/3) dry; weak fine and medium subangular blocky structure; moderately hard, friable; slightly sticky and slightly plastic; many very fine, common medium and few coarse roots; many very fine, few fine and medium tubular pores; few very fine manganese masses; neutral (pH 6.6); gradual wavy boundary. (4 to 9 inches thick)
Bt-- 22 to 29 inches; dark brown (10YR 3/3) silt loam, pale brown (10YR 6/3) dry; weak and moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine, medium and few coarse roots; many very fine, fine and few medium tubular pores; common faint continuous clay films on faces of peds; few very fine manganese masses; slightly acid (pH 6.5); abrupt wavy boundary. (0 to 7 inches thick)
EBc-- 29 to 31 inches; light olive brown (2.5Y 5/3) silt loam, light gray (2.5Y 7/2) dry; weak fine and medium subangular blocky structure; moderately hard, friable, slightly sticky and slightly plastic; common very fine, few medium and coarse roots; many very fine, fine and few medium tubular pores; about 90 percent of horizon is uncoated silt grains (E material) and 10 percent B material; many very fine and few fine iron-manganese concretions; common fine prominent yellowish brown (10YR 5/4) iron masses, light yellowish brown (10YR 6/4)dry; very strongly acid (pH 4.6); abrupt wavy boundary. (0 to 5 inches thick)
Btxcb1-- 31 to 37 inches; mixed brown (10YR 4/3) and dark yellowish brown (10YR 4/4) silty clay loam, mixed yellowish brown (10YR 5/4) and light yellowish brown (10YR 6/4) dry; moderate medium prismatic structure; very hard, extremely firm and brittle, moderately sticky and moderately plastic; common very fine, few fine, medium and coarse roots between peds; many very fine, fine and few medium tubular pores; many prominent discontinuous brown (7.5YR 4/3) dry clay films on faces of peds; about 15 percent white (10YR 8/1) dry E material on vertical and top faces of peds; common very fine and few fine iron-manganese concretions; about 60 percent fragic material; very strongly acid (pH 4.7); gradual wavy boundary.
Btxcb2-- 37 to 53 inches; yellowish brown (10YR 5/4) silty clay loam, light yellowish brown (10YR 6/4) dry; weak fine and medium prismatic structure; very hard, extremely firm and brittle, moderately sticky and moderately plastic; few very fine, fine and medium roots between peds; many very fine, fine and few medium tubular pores; many prominent discontinuous brown (7.5YR 4/3) dry clay films on faces of peds and in pores, and few continuous light gray (10YR 7/2) dry silt coats and E material on vertical and top faces of peds; about 75 percent fragic material; strongly acid (pH 5.1); gradual wavy boundary. (combined thickness of Btxcb horizons is 14 to 25 inches thick)
Btxb-- 53 to 60 inches; yellowish brown (10YR 5/4) silty clay loam, very pale brown (10YR 7/4) dry; weak fine and medium prismatic structure; very hard, extremely firm, moderately sticky and moderately plastic; few very fine, fine and medium roots between peds; many very fine and fine tubular pores; many distinct continuous brown (7.5YR 4/3) dry clay films on faces of peds, and few discontinuous light gray (10YR 7/2) dry silt coats and E material on vertical and top faces of peds; few very fine iron-manganese concretions; about 60 percent fragic material; slightly acid (pH 6.1).
TYPE LOCATION: Benewah County, Idaho; about 5.5 miles west of the town of Plummer, Idaho; about 1875 feet north and 250 feet west of the southeast corner of section 18, T.46N., R.5W.; Latitude 47 degrees, 19 minutes, 40 seconds North; Longitude 117 degrees, 00 minutes, 08 seconds West; NAD 83; USGS Tekoa Mountain quadrangle.
RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry for 45 to 60 consecutive days mid-July to mid-September, moist mid-September to mid-July (xeric moisture regime)
Average annual soil temperature - 41 to 47 degrees F
Average summer soil temperature - 51 to 55 degrees F with an O horizon (frigid temperature regime)
Thickness of mollic epipedon - 10 to 20 inches
Depth to base of argillic - 45 to 60 inches or more
Depth to fragipan - 27 to 40 inches
Particle-size control section (weighted average): Clay content - 18 to 20 percent
Vitrandic feature thickness - 10 to 20 inches
Volcanic glass content in the 0.02 to 2.0 mm fraction - 5 to 20 percent
Acid-oxalate extractable Al plus 1/2 Fe - 0.4 to 1.0 percent
Phosphate retention - 30 to 40 percent
15-bar water retention on air dried samples - 10 to 13 percent
Moist bulk density - 1.2 to 1.3 g/cc
A horizon (Ap horizons when present)
Hue - 10YR or 7.5YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 1 to 3, dry or moist
Texture - ashy silt loam
Clay content - 15 to 25 percent
Reaction - strongly acid to neutral
BA horizon
Hue - 10YR or 7.5 YR
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3, dry or moist
Texture - ashy silt loam
Clay content - 15 to 23 percent
Reaction - moderately acid to neutral
Bw or Bt horizons
Hue - 10YR
Value - 4 to 6 dry, 3 to 5 moist
Chroma - 2 to 4, dry or moist
Texture - silt loam
Clay content - 18 to 25 percent
Reaction - moderately acid to neutral
EBc
Hue - 10YR
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 to 4 dry, 3 moist
Texture - silt loam
Clay content - 10 to 20 percent
Reaction - very strongly acid to moderately acid
Ec or E horizons (present in some pedons)
Hue - 10YR or 2.5Y
Value - 6 to 8 dry, 3 to 6 moist
Chroma - 1 to 4 dry, 3 or 4 moist
Texture - silt loam, silt
Clay content - 10 to 20 percent
Reaction - strongly acid to slightly acid
Btxcb horizons (Btxb/E in some pedons)
Hue - 7.5YR or 10YR
Value - 5 or 6 dry, 3 to 5 moist
Chroma - 3 to 6 dry, 2 to 6 moist
Texture - silty clay loam, silt loam
Clay content - 23 to 36 percent
Gravel content - 0 to 5 percent
Total rock fragment content - 0 to 5 percent
Reaction - very strongly acid to slightly acid
Bulk density - 1.60 to 1.75 g/cc
Btxb (Btb in some horizons)
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 3 or 4, dry or moist
Texture - silty clay loam, silt loam, silty clay
Clay content - 20 to 42 percent
Gravel content - 0 to 5 percent
Total rock fragment content - 0 to 5 percent
Reaction - moderately acid to neutral
Bulk density - 1.5 to 1.75 g/cc
COMPETING SERIES: These are the Hurwal and Powwatka series. Hurwal soils have a mollic epipedon 20 to 30 inches thick, a lithic contact at 40 to 60 inches and do not have an albic horizon. Powwatka soils are 20 to 40 inches to a lithic contact.
GEOGRAPHIC SETTING: The Taney soils are on dissected hills and hills on basalt plains, plateaus, and structural benches. The soils formed in deep loess or reworked loess with an influence of volcanic ash in the upper part. Elevation is typically 2,300 to 4,000 feet but may range down to 1,200 feet on north-facing slopes. Slopes are 0 to 35 percent. The average annual precipitation is 24 to 33 inches, including 4 to 5 feet of snow. The average annual temperature is 40 to 45 degrees F. The frost-free period is 80 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Benewah, Santa, and Setters soils. Benewah soils on mountain footslopes, have an ochric epipedon, and do not have a fragipan. Santa soils on loess hills have an ochric epipedon and are less than 18 percent clay in the control section. Setters soils on loess hills, have more than 35 percent clay in the particle-size control section, and do not have a fragipan.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow to very rapid runoff; permeability is moderate above the fragipan and very slow in the fragipan. There is a seasonally perched water table at depths of 16 to 37 inches from November through June.
USE AND VEGETATION: These soils are used mainly for dryland small grain, hay, pasture and woodland. Potential natural vegetation is mainly Douglas fir and ponderosa pine, with an understory of common snowberry, white spirea, creambush oceanspray, mallow ninebark, Nootka rose, Woods rose, Columbia brome, sweetscented bedstraw and pinegrass.
DISTRIBUTION AND EXTENT: Northern Idaho; MLRA 9. The series is of large extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benewah County, Idaho, 1975.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - the zone from 2 to 22 inches (the A, BA and Bw horizons). Mollic epipedon may exclude the Bw in some pedons.
Albic horizon - the zone from 29 to 31 inches (the E/Bc horizon) with chroma never less than 3 moist.
Argillic horizon - the zone from 31 to 60 inches (the Btxcb1, Btxcb2 and Btxb horizons)
Vitrandic feature - the zone from 2 to 15 inches.
Oxyaquic feature - the zone beginning at 29 inches having saturation with water for 30 or more cumulative days.
Particle-size control section - the zone from 10 to 31 inches (part of the BA, the Bw, Bt and E/Bc horizons)
Fragipan- the zone from 31 to 60 inches (the Btxcb and Btxb horizons)
This pedon does not meet Albolls suborder criteria based on presence of moist chroma of 3 within the albic horizon and the E horizon (albic) does not lie directly below the mollic epipedon.
This pedon does not meet aquic subgroup criteria based on the absence of redox depletions (zones of chroma less than those in the matrix) within 30 inches of the mineral soil surface.
ADDITIONAL DATA: This soil has been sampled in Nez Perce County, Idaho by NSSL. Laboratory sample numbers 86P881, soil survey sample numbers S86ID-069-002 and S88ID-069-002 (88P23); Lewis County by NSSL S88ID-061-001 (88p924) and S85ID-061-054 (86O0242); and Clearwater County by NSSL S84ID-035-003 (85P640).