LOCATION BRODY IDEstablished Series
TAXONOMIC CLASS: Ashy-skeletal, mixed Typic Vitricryands
TYPICAL PEDON: Brody cobbly silt loam - forested (Colors are for dry soil unless otherwise noted).
Oi--2 to 1 1/2 inches; undecomposed needles, leaves, cones, and twigs; very strongly acid (pH 4.5); abrupt broken boundary. (0 to 1 inch thick)
Oe--1 1/2 - 0.2 inches; very dark brown (10YR 2/2) partially decomposed needles, leaves, cones, and wood; extremely acid (pH 4.4); abrupt broken boundary. (0 to 2 inches thick)
Oa--0.2 to 0 inches; very dark brown (10YR 2/2)
well-decomposed organic matter; strongly acid (pH 5.2 ); abrupt wavy boundary. (0 to 1/2 inch thick)
Bs1--0 to 3 inches; brown (7.5YR 5/4) cobbly silt loam, dark brown (7.5YR 3/3) moist; moderate very fine and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium roots; many very fine irregular pores; about 20 percent cobbles and gravel; moderately acid (pH 5.9); gradual wavy boundary. (0 to 5 inches thick)
Bs2--3 to 13 inches; brown (7.5YR 5/4) cobbly silt loam, dark brown (7.5YR 4/3) moist; weak very fine and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium roots; many very fine irregular pores; about 15 percent cobbles and gravel; slightly acid (pH 6.2); clear wavy boundary. (8 to 15 inches thick)
Bs3--13 to 30 inches; brown (7.5YR 5/4) extremely gravelly silt loam, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure that parts to weak very fine and fine granular; slightly hard, very friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine tubular pores; about 75 percent basalt fragments, mostly angular gravel and cobbles; slightly acid (pH 6 .1); gradual irregular boundary. (5 to 20 inches thick)
R--30 inches; basalt bedrock. Fractured in upper part.
TYPE LOCATION: Idaho County, Idaho; eastward on Lolo Creek Road 0.3 mile past Cedar Creek Road, then right 1/2 mile to pit on right of road; NE 1/4 SW 1/4 sec. 7, T.34N., R.6E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 38 to 45 degrees F.
Average summer soil temperature - 44 to 47 degrees F. with 0 horizon Volcanic ash mantle - 14 to 40 inches
Volcanic glass content in the 0.02 to 2.0 mm fraction - 30 to 50 percent Acid-oxalate extractable Al plus 1/2 Fe - 1.5 to 3.0 percent Phosphate retention - 25 to 50 percent
15-bar water retention on air dry samples - 9 to 12 percent
Moist bulk density - 0.85 to 1.00 g/cc
Depth to bedrock - 20 to 40 inches
Average rock fragments in control section - 50 to 80 percent
Present in some pedons - faint or thin A or E horizons
Bs horizons
Hue - 10YR, 7.5YR or 5YR
Chroma - dominant 3 or 4, range to 5 or 6
Texture - upper part: SIL, L, SL, CB-SIL, CB-L, lower part: GRX-SIL, GRV-L, CBX-L
Structure - weak or moderate, very fine, fine granular, some profiles, lower part, fine or medium subangular blocky
Base saturation - 30 to 60 percent
COMPETING SERIES: These are the Goatrock (T), Joebaldy (T), and Longjohn (T) series. Goatrock and Longjohn soils are very deep. Joebaldy soils are moderately deep to fragmental material.
GEOGRAPHIC SETTING: Brody soils are on mountains at elevations of 2,100 to 6,000 feet. Slopes are 20 t o 90 percent. The soils formed in loess including volcanic ash and in residuum and colluvium weathered from Columbia River basalt or andesite or greenstone from the Seven Devils volcanoes. The average annual precipitation is 28 to 40 inches including 5 to 10 feet of snow. The average annual temperature is 36 to 43 degrees F. The frost-free season is less than 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Caribel, Helmer, Klicker, Potlatch, Wapshilla and Zaza soils. Caribel soils have argillic horizons. Helmer soils have fragipans. Klicker soils have mollic epipedons. Potlatch soils occupy bottomlands and are poorly drained. Wapshilla soils lack Bs horizons and Zaza soils are 10 to 20 inches deep to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; rapid or medium runoff; moderate permeability.
USE AND VEGETATION: Used for timber production, recreation,
wildlife habitat, and watershed. Vegetation is mainly western redcedar, western white pine, grand fir, western larch, Douglas fir, and Pacific yew with an understory of dogwood, lambstongue, pathfinder, huckleberry, Princes' pine, Pachistima , and twinflower.
DISTRIBUTION AND EXTENT: North-central Idaho and surrounding regions. The series is estimated to be extensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Idaho County, Idaho, 1973.
REMARKS: This revision changes the classification from Loamy-skeletal, mixed Andic Cryochrepts to Ashy-skeletal Typic Vitricryands.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 13 inches (Bs1 and Bs2 horizons)
Cambic horizon - the zone from 13 to 30 inches (Bs3 horizon)
Lithic contact - at 30 inches (R horizon)