LOCATION GARVESON IDEstablished Series
TAXONOMIC CLASS: Ashy over sandy or sandy-skeletal, amorphic over isotic, frigid Typic Udivitrands
TYPICAL PEDON: Garveson ashy silt loam, forested, on a convex north-facing slope of 35 percent at 3,200 feet elevation. When described on April 27, 1982, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1 inch; undecomposed needles, bark, twigs, cones, and moss.
Oe--1 to 2 inches; partially decomposed organic matter.
A--2 to 4 inches; brown (10YR 5/3) ashy silt loam, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky, slightly plastic; many very fine, fine, and few medium and coarse roots; common very fine and few fine tubular and irregular pores; 5 percent fine pebbles; neutral (pH 7.0); clear wavy boundary. (1 to 4 inches thick)
Bw1--4 to 9 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, slightly plastic; many very fine, fine, and few medium and coarse roots; common very fine and few fine tubular and irregular pores; 5 percent fine pebbles; neutral (pH 7.0); clear wavy boundary. (5 to 7 inches thick)
Bw2--9 to 18 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, slightly plastic; common very fine, fine, and few medium roots; common very fine and few fine tubular and irregular pores; 10 percent fine pebbles; neutral (pH 7.0); abrupt wavy boundary. (8 to 10 inches thick)
2BC--18 to 25 inches; pale brown (10YR 6/3) very gravelly loamy coarse sand, brown (10YR 4/3) moist; weak coarse subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; common very fine and few fine tubular and irregular pores; 40 percent fine pebbles; slightly acid (pH 6.5); clear wavy boundary. (0 to 7 inches thick)
2C1--25 to 32 inches; very pale brown (10YR 7/3) very gravelly loamy coarse sand, brown (10YR 5/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine irregular pores; 40 percent fine pebbles; moderately acid (pH 6.0); gradual wavy boundary. (7 to 14 inches thick)
2C2--32 to 62 inches; variegated very gravelly coarse sand; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine irregular pores; 40 percent fine pebbles; moderately acid (pH 6.0).
TYPE LOCATION: Benewah County, Idaho; about 1.5 miles west of Pettis Peak, about 500 feet south and 800 feet west of the northeast corner of sec. 22, T. 45 N., R. 1 W. Latitude - 47 degrees, 14 minutes, 16 seconds North; Longitude - 116 degrees, 26 minutes, 20 seconds West; USGS Santa quadrangle.
RANGE IN CHARACTERISTICS:
Soil moisture - usually dry for 25 to 35 consecutive days August to September, moist mid-September through July. Udic moisture regime.
Average annual soil temperature - 39 to 45 degrees F
Average summer soil temperature - 48 to 50 degrees F with an O horizon. Frigid temperature regime.
Depth to bedrock - greater than 60 inches
Solum thickness - 18 to 28 inches
Volcanic ash mantle - 14 to 20 inches
Volcanic glass content - 15 to 65 percent
Acid-oxalate extractable Al + 1/2 Fe - 1.0 to 3.0 percent
Phosphate retention - 55 to 95 percent
15-bar water retention on air dried samples - 7 to 12 percent
A horizon
Hue - 10YR or 7.5YR
Value - 5 or 6 dry and 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - ASHY-SIL, ASHY-L
Clay content - 3 to 9 percent
Rock fragments - 0 to 10 percent gravel
Bulk density - 0.65 to 0.85 g/cc
Reaction - moderately acid to neutral
Bw horizons
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 to 6 dry or moist
Texture - ASHY-SIL, ASHY-L, CB-ASHY-SIL
Clay content - 3 to 9 percent
Rock fragments - 0 to 10 percent gravel, 0 to 25 percent cobbles, 0 to 30 percent total rock fragments
Bulk density - 0.65 to 1.00 g/cc
Reaction - moderately acid to neutral
2BC horizon
Value - 6 to 8 dry and 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - GR-LS, GR-LCOS, GRV-LS, GRV-LCOS, LS, CB-SL, CBX-SL
Clay content - 2 to 5 percent
Rock fragments - 5 to 40 percent gravel, 0 to 45 percent cobbles, 5 to 65 percent total rock fragments
Reaction - moderately acid or slightly acid
2C horizon
Hue - Variegated or 10YR or 2.5Y
Value - 6 to 8 dry and 4 to 7 moist
Chroma - 3 to 6 dry or moist
Texture - GR-LS, GR-LCOS, GR-COS, GRV-LS, GRV-LCOS, GRV-COS, GRX-COS, ST-LCOS,
Clay content - 0 to 10 percent
Rock fragments - 20 to 75 percent gravel, 0 to 15 percent cobbles, 0 to 25 percent stones, 20 to 90 percent total rock fragment content
Reaction - very strongly acid to moderately acid
COMPETING SERIES: This is the Hysing series. Hysing soils are deep to a paralithic contact.
GEOGRAPHIC SETTING: Garveson soils are on all aspects of foothills and mountains. Slopes range from 15 to 65 percent. These soils formed in residuum weathered from gneiss or granitic bedrock with a thick mantle of volcanic ash. Elevations range from 1,600 to 5,500 feet. The average annual air temperature ranges from 38 to 45 degrees F, and the average annual precipitation is 30 to 65 inches. The average frost-free period is from 50 to 110 days (9 years in 10 to 1 year in 10 respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bouldercreek (T), Floodwood (T), Jacot, and Nakarna soils. The Bouldercreek soils are loamy-skeletal in the lower part of the control section and are on north-facing mountains. The Jacot soils are ashy over loamy and are on foothills. The Nakarna soils are ashy over loamy and are on mountains. The Floodwood soils have fine-loamy argillic horizons and are on mountains.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability in the solum and very rapid permeability in the substratum.
USE AND VEGETATION: These soils are used mainly for timber production, wildlife habitat, recreation, livestock grazing, and watershed. A few areas are used for homesites. Potential natural vegetation is mainly western hemlock, western redcedar, western white pine, grand fir, Douglas-fir, western larch and lodgepole pine with an understory of queencup beadlily, myrtle pachystima, longtube twinflower, oneleaf foamflower, pacific trillium, starry false-Solomons-seal, goldthread, bunchberry dogwood, and common prince's pine. Soils with high precipitation have wild ginger.
DISTRIBUTION AND EXTENT: Northern Idaho. This soil is not extensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Benewah County, Idaho, 1975.
REMARKS: These soils were formerly classified as medial over sandy or sandy-skeletal, mixed, frigid Typic Vitrandepts.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone 2 to 4 inches (A horizon)
Cambic horizon - the zone from 4 to 18 inches (Bw1 and Bw2 horizons)
Volcanic ash mantle - the zone from 2 to 18 inches (A, Bw1 and Bw2 horizons)
Particle-size control section - the zone from 2 to 42 inches (A, Bw1, Bw2, 2BC, 2C1 and part of the 2C2 horizons)
ADDITIONAL DATA: Laboratory data exists for a similar pedon that was sampled as Garveson. Classification using the data showed this pedon to be in a closely related family. Soil Survey Sample Number S92ID-035-031 (project no. 92P 181, pedon no. 92P 969) Clearwater County, Idaho by NSSL, Lincoln NE.