LOCATION HUBUB                   ID

Established Series
Rev. BG-ER-JAL
01/2023

HUBUB SERIES

The Hubub series consists of very deep, well drained soils on terraces and benches. They formed in colluvium and old alluvium derived dominantly from quartzite, gneiss or mica schist, with a thick mantle of volcanic ash. Permeability is moderate. Slopes are 5 to 40 percent. The average annual precipitation is about 38 inches and average annual air temperature is about 42 degrees F.

TAXONOMIC CLASS: Ashy over loamy, amorphic over mixed, active, frigid Alfic Udivitrands

TYPICAL PEDON: Hubub ashy silt loam on a southwest slope of 26 percent at an elevation of 2,950 feet in a forested area. When described on July 24, 1995, the soil was moist throughout. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 0.5 inches; slightly decomposed needles, leaves, twigs and moss.

Oe--0.5 to 2 inches; moderately decomposed needles, leaves, twigs and moss. (O horizons 0 to 2 inches thick)

A--2 to 5 inches; brown (7.5YR 5/4) ashy silt loam, dark brown (7.5YR 3/3) moist; weak fine and medium granular structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine, and common medium and coarse roots; many very fine, common fine and medium irregular and few coarse tubular pores; 5 percent fine rounded iron-manganese concretions; slightly acid (pH 6.2); abrupt wavy boundary. (2 to 6 inches thick)

Bw1--5 to 11 inches; yellowish brown (10YR 5/4) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure parting to moderate very fine and fine granular; soft, very friable, nonsticky and slightly plastic; many very fine, fine and medium, and common coarse and very coarse roots; many very fine and common fine irregular, and few medium and coarse tubular pores; 2 percent fine rounded iron-manganese concretions; moderately acid (pH 6.0); clear wavy boundary.

Bw2--11 to 17 inches; light yellowish brown (10YR 6/4) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure parting to moderate very fine and fine granular; soft, very friable, nonsticky and slightly plastic; many very fine, fine and medium, and common coarse and very coarse roots; many very fine, common fine and few medium and coarse irregular pores; 2 percent fine rounded iron-manganese concretions; moderately acid (pH 6.0); abrupt wavy boundary. (Bw horizons 9 to 17 inches thick)

2E--17 to 19 inches; brown (7.5YR 5/4) silt loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure parting to weak fine and medium granular; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium and coarse roots; common very fine irregular and many very fine and few fine tubular pores; moderately acid (pH 5.6) abrupt wavy boundary. (0 to 13 inches thick)

2Bt1--19 to 24 inches; brown (7.5YR 5/4) silt loam, dark brown (7.5YR 3/4) moist; weak medium prismatic structure parting to moderate fine and medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium, and few coarse roots; common very fine irregular and many very fine and few fine tubular pores; few faint, patchy clay films on faces of peds; few faint skeletans on faces of peds; moderately acid (pH 5.6); clear wavy boundary. (5 to 10 inches thick)

2Bt2--24 to 34 inches; yellowish brown (10YR 5/4) silt loam, brown (7.5YR 4/4) moist; weak medium prismatic structure parting to strong fine and medium subangular blocky; hard, friable, slightly sticky and slightly plastic; common very fine and few medium and coarse roots; common very fine irregular, many very fine and few fine tubular pores; common faint clay films in pores and few faint clay films on faces of peds; few faint skeletans on faces of peds; moderately acid (pH 5.6); clear wavy boundary. (7 to 19 inches thick)

2Bt3--34 to 42 inches; strong brown (7.5YR 4/6) silt loam, dark brown (7.5YR 3/4) moist; weak medium prismatic structure parting to strong fine and medium subangular blocky; hard, friable, moderately sticky and slightly plastic; common very fine and few fine and medium roots; few very fine irregular and many very fine and few fine tubular pores; many faint clay films on faces of peds and in pores; few faint skeletans on faces of peds; trace amount of fine mica flakes; very strongly acid (pH 4.8); abrupt wavy boundary. (0 to 8 inches thick)

2Bt4--42 to 56 inches; strong brown (7.5YR 4/6) very cobbly sandy clay loam, strong brown (7.5YR 4/6) moist; moderate fine, medium and coarse subangular blocky structure; hard, friable, moderately sticky and slightly plastic; few very fine and fine roots; many very fine irregular and many very fine and few fine tubular pores; many distinct brown (7.5YR 5/4) clay films on faces of peds and in pores; 5 percent fine mica flakes; 20 percent rounded gravel; 15 percent rounded cobbles; very strongly acid (pH 4.8); clear wavy boundary. (5 to 15 inches thick)

2Bt5--56 to 62 inches; reddish yellow (7.5YR 6/6) very cobbly loam, strong brown (7.5YR 5/6) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine irregular and common very fine and few fine tubular pores; many prominent dark reddish brown (5YR 3/4) clay films on faces of peds; 5 percent fine mica flakes; 25 percent rounded gravel, 20 percent rounded cobbles and 3 percent rounded stones; very strongly acid (pH 4.8).

TYPE LOCATION: Clearwater County, Idaho; about 3 miles north and 9 miles east of Elk River, Idaho; about 1,900 feet north and 2,150 feet east of the southwest corner of Sec. 7, T40N, R4E; Latitude - 46 degrees, 49 minutes, 22 seconds North; Longitude - 116 degrees, 00 minutes, 24 seconds West; USGS Elk Butte Quadrangle.

RANGE IN CHARACTERISTICS:

Soil moisture - usually dry for less than 45 consecutive days from June to October. Udic moisture regime.
Average annual soil temperature - 43 to 46 degrees F.
Average summer soil temperature - 47 to 50 degrees F with an O horizon. Frigid temperature regime.
Depth to zone containing at least 30 percent rock fragments - 30 to 59 inches
Solum thickness - greater than 60 inches

Volcanic ash mantle - 14 to 21 inches
Volcanic glass content in the 0.02 to 2.0 mm fraction - 15 to 60 percent
Acid-oxalate extractable Al plus 1/2 Fe - 1.0 to 2.7 percent
Phosphate retention - 55 to 95 percent
15-bar water retention on air dried samples - 7 to 12 percent

A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 3 or 4 moist
Chroma - 3 or 4 dry, 2 to 4 moist
Textures - ASHY-SIL, ASHY-L
Clay content - 8 to 14 percent
Rock fragments - 0 to 3 percent gravel
Bulk density - 0.65 to 0.90 g/cc
Reaction - moderately acid to neutral

Bw horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 or 6 dry, 3 or 4 moist
Textures - ASHY-SIL, ASHY-L
Clay content - 8 to 15 percent
Rock fragments - 0 to 5 percent gravel
Bulk density - 0.65 to 1.00 g/cc
Reaction - strongly acid to slightly acid

2E horizon (2EB, 2E/B when present)
Hue - 7.5YR or 10YR dry or moist
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 2 to 4 dry, 3 to 6 moist
Textures - SIL, L, GR-L
Clay content - 12 to 23 percent
Rock fragments - 0 to 15 percent gravel, 0 to 10 percent cobbles, 0 to 25 percent total rock fragment content
Reaction - very strongly acid to slightly acid

2Bt horizons
Upper part:
Hue - 7.5YR or 10YR dry, 5YR to 10YR moist
Value - 4 to 7 dry, 3 to 5 moist
Chroma - 3 to 6 dry or moist
Textures - SIL, SICL, CL, GR-L, GR-SIL, GR-SICL, GR-SCL
Clay content - 20 to 30 percent
Rock fragments - 0 to 25 percent gravel, 0 to 5 cobbles, 0 to 25 percent total rock fragment content
Reaction - very strongly acid to moderately acid

Lower part:
Hue - 7.5YR or 10YR dry or moist
Value - 4 to 6 dry, 4 or 5 moist
Chroma - 4 to 6 dry or moist
Textures - GR-L, GRV-L, CBV-L, GRV-SCL, CBV-SCL, GRV-SL, CBV-SL, CBX-SL
Clay content - 18 to 30 percent
Rock fragments - 20 to 40 percent gravel, 0 to 30 percent cobbles, 0 to 3 percent stones, 30 to 62 percent total rock fragment content
Reaction - very strongly acid to moderately acid

COMPETING SERIES: These are the Bargamin, Berray, Hobnail, Revling, and Tomodo series. Bargamin soils have less than 20 percent rock fragments in the lower argillic. Hobnail soils have a perched water table at 12 to 24 inches February to April making them moderately well drained. Tomodo soils have fragic characteristics. Revling soils have 3Btb horizons.

GEOGRAPHIC SETTING: Hubub soils are on all aspects of terraces and benches. Slopes range from 5 to 40 percent. These soils formed in colluvium and old alluvium derived dominantly from quartzite, gneiss, or mica schist, with a thick mantle of volcanic ash. Elevations range from 1,600 to 3,900 feet. The average annual air temperature ranges from 38 to 44 degrees F, and average annual precipitation is 30 to 50 inches. The frost-free period is from 50 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Grandad, Keeler, Lostpete, and Odonnell series. Grandad soils are on mountains and have a paramicaceous subsoil. Keeler soils are on mountains and have a mixed volcanic ash mantle. Lostpete and Odonnell soils are on mountains and benches and have silt loam and silty clay loam textures in the lower 2Bt horizon.

DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderate permeability.

USE AND VEGETATION: These soils are used for timber production, livestock grazing, recreation, and wildlife habitat. Potential natural vegetation is mainly western redcedar, western white pine, grand fir, Douglas-fir, western larch, and lodgepole pine, with an understory of queencup beadlily, American trailplant, Columbia brome, darkwoods violet, starry false-Solomon's-seal, sweetscented bedstraw, goldthread, Oregon fairybells, oneleaf foamflower, piper anemone, northern twinflower, and western rattlesnake plantain.

DISTRIBUTION AND EXTENT: Northern Idaho. This soil is not extensive.

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

SERIES ESTABLISHED: Clearwater County, Idaho, 2003.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - the zone from 2 to 5 inches (A horizon).

Cambic horizon - the zone from 5 to 17 inches (Bw1 and Bw2 horizons)

Albic horizon (not present in all pedons) - the zone from 17 to 19 inches (2E horizon).

Argillic horizon - the zone from 19 to 62 inches (2Bt1, 2Bt2, 2Bt3, 2Bt4 horizons).

Volcanic ash mantle - the zone from 2 to 17 inches (A, Bw1, and Bw2 horizons).

Particle-size control section - the zone from 2 to 42 inches (A, Bw1, Bw2, 2E, 2Bt1, 2Bt2, and a portion of 2Bt3 horizons).

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National Cooperative Soil Survey
U.S.A.