LOCATION GOATROCK IDEstablished Series
TAXONOMIC CLASS: Medial-skeletal, glassy Typic Fulvicryands
TYPICAL PEDON: Goatrock very stony medial silt loam, open alpine forest; on a south facing slope of 70 percent at 5600 feet elevation. When described on August 23, 1984, the soil was very slightly moist to 24 inches and dry below. (Colors are for dry soil unless otherwise stated).
Oi--0 to 0.5 inch; slightly decomposed grasses, leaves, and twigs.
A--0.5 to 8 inches; grayish brown (10YR 5/2) very stony medial silt loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, medium, and coarse roots; many very fine and fine tubular pores; 20 percent pebbles, 20 percent cobbles, and 10 percent stones; neutral (pH 6.6); gradual wavy boundary. (6 to 8 inches thick)
Bw1--8 to 17 inches; brown (10YR 5/3) very cobbly medial silt loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, medium, and coarse roots; many very fine and fine tubular pores; 15 percent pebbles, 30 percent cobbles, and 10 percent stones; neutral (pH 6.8); clear wavy boundary. (8 to 10 inches thick)
Bw2--17 to 26 inches; yellowish brown (10YR 5/4) extremely cobbly medial silt loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, fine, medium, and few coarse roots; many very fine and fine tubular pores; 30 percent pebbles, 30 percent cobbles, and 10 percent stones; neutral (pH 6.8); clear wavy boundary. (9 to 12 inches thick)
2BC--26 to 36 inches; light yellowish brown (10YR 6/4) extremely gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular pores; 40 percent pebbles, 15 percent cobbles, and 10 percent stones; slightly acid (pH 6.5); gradual wavy boundary. (10 to 12 inches thick)
2C1--36 to 46 inches; light yellowish brown (10YR 6/4) extremely gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, nonsticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular and interstitial pores; 40 percent pebbles, 20 percent cobbles, and 10 percent stones; moderately acid (pH 5.8); gradual wavy boundary. (10 to 13 inches thick)
2C2--46 to 60 inches; very pale brown (10YR 7/4) extremely gravelly loamy sand, yellowish brown (10YR 5/4) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine and fine interstitial pores; 50 percent pebbles, 20 percent cobbles, and 10 percent stones; moderately acid (pH 6.0).
TYPE LOCATION: Shoshone County, Idaho; about 20 miles east of Clarkia, about 400 feet south and 1100 feet west of the northeast corner of section 22, T.42 N., R.5 E.
RANGE IN CHARACTERISTICS:
Depth to bedrock - more than 60 inches
Solum thickness - 35 to 42 inches
Umbric epipedon thickness - 14 to 18 inches
Moisture control section - dry August to mid September (15 to 25 days); moist September through July. Udic moisture regime.
Volcanic ash mantle - 25 to 30 inches thick
Volcanic glass content in the 0.02 to 2.0 mm fraction - 30 to 65 percent
Acid-oxalate extractable Al + 1/2 Fe - 2.0 to 4.0 percent
Phosphate retention - 80 to 100 percent
15 bar water retention on air dried samples - 15 to 18 percent
Average annual soil temperature - 39 to 42 degrees F
Average summer soil temperature - 44 to 46 degrees F with an O horizon
Surface stones - 3 to 15 percent
A horizon
Chroma - 2 or 3 dry or moist
Rock fragments - 35 to 55 percent
Bulk density - 0.65 to 0.85 g/cc
Reaction - slightly acid or neutral
Organic carbon content - 8 to 11 percent
Bw horizon
Value - 5 or 6 dry and 3 or 4 moist
Texture - CBV-SIL, CBX-SIL, STV-SIL, STX-SIL
Rock fragments - 50 to 70 percent
Bulk density - 0.65 to 0.85 g/cc
Reaction - slightly acid or neutral
Organic carbon content - 1 to 7 percent
2C horizon
Chroma - 3 or 4 dry or moist
Texture - GRX-SL, CBX-SL, STX-SL, GRX-LS, CBX-LS, STX-LS
Rock fragments - 65 to 90 percent
Reaction - strongly acid to slightly acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Goatrock soils are on south-facing high elevation mountain slopes. Slopes range from 35 to 75 percent. These soils formed in material weathered from granite, gneiss, or schist with a thick mantle of volcanic ash. Elevations range from 5000 to 6300 feet. The average annual air temperature ranges from 38 to 42 degrees F, average annual precipitation is 55 to 65 inches, and frost-free season is from 30 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Floodwood, Odonnell, and Vay soils. Floodwood and Odonnell soils are on foothills and have argillic horizons. Vay soils are on mountain ridgetops on north, east, and west-facing slopes and are ashy over loamy-skeletal.
DRAINAGE AND PERMEABILITY: well drained; medium to rapid runoff; moderate permeability in the solum and rapid in the substratum.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, recreation, and watershed. Potential natural vegetation is mainly sparse subalpine fir and mountain hemlock with and understory of big blueberry, common beargrass, common yarrow, Columbia brome, green fescue, sedges, and Sitka mountainash.
DISTRIBUTION AND EXTENT: Northern Idaho. This soil is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Shoshone County, Idaho, 1993.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - the zone from the mineral soil surface to 17 inches (A and Bw1 horizons)
Cambic horizon - the zone from 17 to 36 inches (Bw2 and 2BC horizons)
Volcanic ash mantle - the zone from the mineral soil surface to 26 inches (A, Bw1,and Bw2 horizons)
Particle-size control section - the zone from the mineral soil surface to 40 inches (A, Bw1, Bw2, 2BC, and part of 2C1 horizon)