LOCATION HUCKLE IDTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Udivitrands
TYPICAL PEDON: Huckle ashy silt loam, forested; on a northwest-facing slope of 42 percent at 3,500 feet elevation. When described on June 19, 2000, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1.5 inches; slightly decomposed needles, leaves, twigs, cones, and bark. (0.5 to 1.5 inches thick)
Oe--1.5 to 3 inches; decomposed organic matter mixed with 1980 Mt. St. Helens volcanic ash. (0.5 to 1.5 inches thick)
A--3 to 4 inches; dark grayish brown (10YR 4/2) ashy 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 common medium and coarse roots; many very fine, fine, and common medium tubular pores; 10 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (1 to 3 inches thick)
Bwl--4 to 8 inches; yellowish brown (10YR 5/4) ashy silt loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and common medium and coarse roots; many very fine, fine, and common fine tubular pores; 10 percent gravel; neutral (pH 6.8); gradual wavy boundary. (4 to 6 inches thick)
Bw2--8 to 13 inches; light yellowish brown (10YR 6/4) ashy silt loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and common medium and coarse roots; many very fine, fine, and common medium tubular pores; 10 percent gravel; neutral (pH 6.6); gradual wavy boundary. (5 to 14 inches thick)
Bw3--13 to 19 inches; light yellowish brown (10YR 6/4) gravelly ashy silt loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many very fine, fine, and common medium tubular pores; 15 percent gravel; slightly acid (pH 6.5); abrupt wavy boundary. (0 to 6 inches thick)
2Bw4--19 to 28 inches; pale brown (10YR 6/3) very cobbly silt loam, brown (10YR 4/3) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; many very fine, fine, and few medium and coarse tubular pores; 15 percent gravel and 35 percent cobbles; neutral (pH 6.6); clear wavy boundary. (5 to 18 inches thick)
2BC--28 to 38 inches; very pale brown (10YR 8/4) extremely cobbly silt loam, light yellowish brown (10YR 6/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; common very fine, fine, and few medium and coarse tubular pores; 20 percent gravel, 40 percent cobbles, and 3 percent fine paragravel; slightly acid (pH 6.5); gradual wavy boundary. (8 to 12 inches thick)
2C--38 to 47 inches; yellow (10YR 8/6) extremely cobbly loam, brownish yellow(10YR 6/6) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; common very fine, fine, and few medium and coarse tubular pores; 20 percent gravel, 40 percent cobbles, 5 percent stones, and 10 percent fine paragravel; slightly acid (pH 6.5); clear wavy boundary. (8 to 10 inches thick)
2Cr--47 to 60 inches; weathered and fractured metasedimentary siltite bedrock.
TYPE LOCATION: Benewah County, Idaho; southeast of Plummer, about 1,650 feet north and 1,880 feet west of the southeast corner of sec. 26, T. 46 N., R. 4 W. Latitude 47 degrees, 17 minutes, 54 seconds North; Longitude 116 degrees, 47 minutes, 48 seconds West; NAD 83; USGS Chatcolet Quadrangle.
RANGE IN CHARACTERISTICS:
(Depth to diagnostic horizons and features measured from the top of the first mineral layer.)
Moisture control section - usually dry for 25 to 40 consecutive days August to September, moist mid-September through July
Average annual soil temperature - 43 to 47 degrees F.
Average summer soil temperature - 48 to 52 degrees F with an O horizon
Depth to paralithic contact - 40 to 60 inches
Volcanic ash mantle - 14 to 24 inches thick
Volcanic glass content - 30 to 50 percent
Acid-oxalate extractable Al + 1/2 Fe - 0.5 to 2.0 percent
Phosphate retention - 55 to 70 percent
15 bar water (air dried) - 7 to 12 percent
A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - ASHY SIL, GR-ASHY SIL
Gravel content - 0 to 20 percent
Clay content - 5 to 10 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - slightly acid or neutral
Bw horizons
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - ASHY SIL, GR-ASHY SIL
Gravel content - 0 to 20 percent
Clay content - 5 to 10 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - slightly acid or neutral
2Bw horizon
Hue - 10YR, 7.5YR, or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - CBV-SIL, GRV-L, CBV-L, GRV-SIL, CBX-L
Gravel content - 15 to 40 percent
Cobble content - 0 to 50 percent
Clay content - 5 to 15 percent
Reaction - moderately acid to neutral
2BC horizon (when present)
Hue - 10YR, 7.5YR, or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - CBX-SIL, CBX-L, CBV-SIL, CBV-L, CBV-FSL, GRV-SIL
Gravel content - 15 to 40 percent
Cobble content - 5 to 45 percent
Paragravel content - 0 to 5 percent
Clay content - 5 to 15 percent
Reaction moderately acid or slightly acid
2C horizon
Hue - 10YR or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 to 6 dry or moist
Texture - CBX-L, CBX- SIL, CBV- L, CBV-SIL, CBX-FSL, CBX-SL
Gravel content - 10 to 30 percent
Cobble content - 15 to 50 percent
Stone content - 0 to 10 percent
Paragravel content - 0 to 10 percent
Clay content - 5 to 15 percent
Reaction - moderately acid or slightly acid
COMPETING SERIES: These are the Boulderjud(T), Bulgar(T), Bullroar(T), Deardorf(T), Ferguson, Gutridge(T), Stalter(T), Threecent(T) and Twobit(T) series.
Boulderjud soils: loamy-skeletal part of the particle-size control section is dominated by subangular rock fragments of granitic origin; have loamy sand textures in the 2C horizon with greater than 40 percent coarse and very coarse sand.
Bulgar soils: very deep; ashy part of the particle-size control section has 60 to 90 percent glass; loamy-skeletal part of the particle-size control section is dominated by rounded rock fragments of granitic till origin.
Bullroar soils: very deep; ashy part of the particle-size control section has 60 to 90 percent glass; loamy-skeletal part of the particle-size control section is dominated by rounded rock fragments of mixed alluvial origin.
Deardorf soils: are moderately deep to a lithic contact.
Ferguson soils: are very deep; texture of ash mantle is fine sandy loam; depth to 2C horizon with loamy coarse sand or sand (sandy-skeletal) is 40 to 60 inches; have subrounded and rounded granitic rock fragments of glaciofluvial origin in the lower particle-size control section.
Gutridge soils: are deep to a lithic contact; have an EBb horizon; and a glass content in the 0.02-2.0 mm fraction of the ashy part of the particle-size control of 60 to 90 percent.
Stalter soils: are moderately deep to a paralithic contact; have a 2Eb horizon; and have and a glass content in the 0.02-2.0 mm fraction of the ashy part of the particle-size control of 60 to 90 percent.
Threecent soils: are moderately deep to a lithic contact; have a 2Eb horizon; and have and a glass content in the 0.02-2.0 mm fraction of the ashy part of the particle-size control of 60 to 90 percent.
Twobit soils: are moderately deep to a lithic contact; have a 2Eb horizon; have a glass content in the 0.02-2.0 mm fraction of the ashy part of the particle-size control of 60 to 90 percent; and have 18 to 27 percent clay in the lower loamy-skeletal part of the particle-size control section.
Similar soils that have mixed mineralogy are the
Bonnash,
Bouldercreek and
Dewberry series. These soils are very deep.
Bonnash soils: very deep; mixed alluvium and glacial till origin.
Bouldercreek soils: very deep; granitic,schist, or quartzite origin
Dewberry soils: very deep; alluvial origin
Similar soils that have glassy mineralogy are the Honeyjones and Swift series.
Honeyjones soils: very deep to bedrock.
Swift soils: very deep; upper part of particle-size control section has 10 to 35 percent pumice cinders.
GEOGRAPHIC SETTING: Huckle soils are on north aspects of mountain backslopes. Slope ranges from 5 to 70 percent. The soils formed in residuum and colluvium derived from metasedimentary bedrock, predominantly siltite and fine grained quartzite, with a thick mantle of volcanic ash. Elevation is 2,200 to 4,800 feet. The mean annual air temperature is 42 to 46 degrees F. The mean annual precipitation is 25 to 40 inches. The frost-free period is 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ardenvoir and Saint Maries (T) soils. Ardenvoir soils are loamy-skeletal, do not have a thick volcanic ash mantle, and are on adjacent south aspects of mountains. Saint Maries soils do not have a thick volcanic ash mantle, are very deep, and are on east and west aspects of concave mountain backslopes.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for timber production, recreation, wildlife habitat, and watershed. Potential natural overstory vegetation is mainly western red cedar, grand fir, Douglas fir, western white pine, and western larch and with an understory of queencup beadlily, longtube twinflower, starry false Solomons-seal, hooker fairybells, Idaho goldthread, pacific trillium, darkwoods violet, myrtle pachystima, and western rattlesnake plantain.
DISTRIBUTION AND EXTENT: Northern Idaho and possibly eastern Washington; MLRA 43. This series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Benewah County, Idaho, 2004. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 7 inches (Oi, Oe, A and part of the Bwl horizon)
Cambic horizon - the zone from 4 to 28 inches (Bwl, Bw2, Bw3 and 2Bw4 horizons)
Andic soil properties - the zone from 3 to 19 inches (A, Bwl, Bw2 and Bw3 horizons)
Particle-size control section - the zone from 3 to 43 inches (A, Bwl, Bw2, Bw3, 2Bw4, 2BC and part of the 2C horizon)
ADDITIONAL DATA: Laboratory data available for Soil Survey Sample Number: S02ID009-003 Benewah County, Idaho. NSSL Pedon Number: 02N1053