LOCATION JURY IDEstablished Series
TAXONOMIC CLASS: Medial over loamy, amorphic over isotic, frigid Typic Udivitrands
TYPICAL PEDON: Jury medial silt loam, forested, on a 45 percent slope at 4,280 feet elevation. Aspect is northwest. When described on September 18, 1984
Oi--0 to 2 inches; slightly decomposed needles, leaves, and twigs. (1 to 2 inches thick)
A--2 to 6 inches; brown (10YR 5/3) medial silt loam, dark brown (7.5YR 3/2) moist; weak very fine, fine, and medium granular structure; soft, very friable, slightly sticky and nonplastic; many very fine, fine, and medium roots; many very fine through coarse tubular and irregular pores; 3 percent gravel; moderately acid (pH 6.0); clear smooth boundary.
Bw--6 to 29 inches; pale brown (10YR 6/3) medial silt loam, dark brown (10YR 3/3) moist; weak very fine, fine, and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine through coarse roots; common very fine and fine tubular and irregular pores; 5 percent gravel; 3 percent mica flakes; 3 percent iron concretions; moderately acid (pH 6.0); abrupt wavy boundary.
2Bw--29 to 48 inches; very pale brown (10YR 7/3) sandy loam, yellowish brown (10YR 5/4) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine through coarse roots; common very fine and fine tubular and irregular pores; 5 percent gravel; moderately acid (pH 5.6); gradual wavy boundary.
2C--48 to 62 inches; very pale brown (10YR 7/3) loamy sand, yellowish brown (10YR 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common fine roots; common very fine and fine tubular pores; 10 percent gravel; few faint clay films lining pores; strongly acid (pH 5.4).
TYPE LOCATION: Clearwater County, Idaho; approximately 7 miles northeast of Pierce, Idaho; about 1,800 feet south and 2,400 feet east of the northwest corner of section 17, T.37N., R.6E.; Latitude - 46 degrees, 33 minutes, 07 seconds North; Longitude - 115 degrees, 46 minutes, 56 seconds, West. USGS French Mountain Quadrangle.
RANGE IN CHARACTERISTICS:
Soil temperature - 43 to 46 degrees F. Frigid temperature regime.
Soil moisture regime - dry for less than 45 consecutive days during the four months following the summer solstice. Udic moisture regime.
Thickness of volcanic ash mantle - 14 to 27 inches
Volcanic glass content - 30 to 50 percent
Acid-oxalate extractable Al+1/2Fe - 1.5 to 2.5 percent
Phosphate retention - 60 to 80 percent
15 bar water retention on air dried samples - 12 to 16 percent (averages less than 15 percent)
A horizon
Hue - 7.5YR or 10YR
Value - 4 or 5 dry, 2 to 3 moist
Chroma - 3 or 4 dry, 1 to 4 moist
Textures - MEDIAL-L, MEDIAL-SIL
Clay content - 8 to 10 percent
Rock fragments - 0 to 3 percent gravel
Reaction - strongly acid to neutral
Bulk density - 0.65 to 0.90 g/cc
Bw horizon
Hue - 7.5YR or 10YR
Value - 4 to 6 dry, 2.5 to 4 moist
Chroma - 3 or 4 dry, 2 to 6 moist
Textures - MEDIAL-L, MEDIAL-SIL, GR-MEDIAL-SIL
Clay content - 8 to 10 percent
Rock fragments - 0 to 16 percent gravel
Reaction - strongly acid to neutral
Bulk density - 0.65 to 1.00 g/cc
2Bw horizon
Hue - 7.5YR to 2.5Y
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 3 to 6 dry, 3 to 8 moist
Textures - L, SL, GR-SL, GR-L, CB-SL, COSL, GR-COSL, CB-COSL
Clay content - 5 to 22 percent
Rock fragments - 0 to 25 percent gravel, 0 to 10 percent cobbles, 0 to 35 percent total rock fragments
Reaction - very strongly acid to slightly acid
2BC horizon (present in some pedons)
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 4 or 6 dry, 3 to 6 moist
Textures - L, SL, FSL, COSL, LS, LCOS, GR-L, ST-L, GR-SL, GRV-COSL
Clay content - 3 to 17 percent
Rock fragments - 0 to 30 percent gravel, 0 to 10 percent cobbles, 0 to 10 percent stones, 0 to 40 percent total rock fragment content
Reaction - very strongly acid to moderately acid
2C horizon
Hue - 10YR or 2.5Y
Value - 6 to 8 dry, 3 to 7 moist
Chroma - 3 to 6 dry or moist
Textures - L, FSL, SL, LS, LCOS, S, COS, GR-SL, CB-SL, STV-SL, GR-COSL CB-COSL, GR-LS, GRV-LS, GR-LCOS, GRV-LCOS
Clay content - 2 to 20 percent
Rock fragments - 0 to 40 percent gravel, 0 to 5 percent cobbles, 0 to 50 percent stones, 0 to 50 percent total rock fragment content
Reaction - very strongly acid to moderately acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Jury soils are on mountain slopes and ridges at elevations of 3,000 to 5,200 feet with slopes of 5 to 65 percent. These soils formed in material from granitic or metamorphic rocks with a thick mantle of volcanic ash. The average annual air temperature is 38 to 44 degrees F. The average precipitation is 40 to 60 inches and the frost-free season is 50 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dullaxe, Judgetown, Fico and Weitas soils. Dullaxe soils are on convex mountain sides and lower ridges and are in an ashy family. Judgetown soils are on convex mountain sides and lower ridges, are in an ashy family and are deep to a paralithic contact. Fico soils are on higher convex mountain slopes and summits and are cryic. Weitas soils are on higher concave mountain slopes, have an umbric epipedon and are cryic.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderate permeability in the upper part and moderately rapid to rapid in the lower part.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, watershed and recreation. Potential natural vegetation is western red cedar, grand fir, western white pine, western larch and Douglas-fir with an understory of wild ginger, queencup beadlily, common goldthread, oneleaf foamflower, bunchberry dogwood, prince's pine and rustyleaf menziesia.
DISTRIBUTION AND EXTENT: North Central Idaho, Jury soils are not extensive
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 2 to 6 inches (A horizon)
Volcanic ash mantle - the zone from 2 to 29 inches (A and Bw1 horizons)
Cambic horizon - the zone from 6 to 48 inches (Bw1 and 2Bw2 horizons)
Particle size control section - the zone from 2 to 42 inches (A, Bw1 and part of the 2Bw2 horizons)
Additional data: A pedon very near this location was sampled by the NSSL. Soil Survey Sample No. S92-ID-035-032, Pedon No. 92P 970.
The ranges in values listed in the Range In Characteristics for Acid-oxalate extractable Al+1/2Fe, Phosphate retention and 15 bar water retention are estimates only.