LOCATION GARVESON ID

Established Series
Rev. CJW-BDG-RJS
10/2015

GARVESON SERIES

The Garveson series consists of very deep, well drained soils on hillslopes and mountain slopes. They formed in volcanic ash over residuum weathered from gneiss or granitic bedrock. Slope ranges from 15 to 65 percent. The mean annual air temperature is about 6.1 degrees C and the mean annual precipitation is about 1,150 mm.

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 an elevation of 975 meters. When described on April 27, 1982, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)

Oi--0 to 3 cm; undecomposed needles, bark, twigs, cones, and moss.

Oe--3 to 5 cm; partially decomposed organic matter. (combined thickness of O horizons - 2 to 10 cm)

A--5 to 10 cm; 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 gravel; neutral (pH 7.0); clear wavy boundary. (3 to 10 cm thick)

Bw1--10 to 23 cm; 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 gravel; neutral (pH 7.0); clear wavy boundary. (13 to 18 cm thick)

Bw2--23 to 46 cm; 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 gravel; neutral (pH 7.0); abrupt wavy boundary. (20 to 25 cm thick)

2BC--46 to 64 cm; 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 gravel; slightly acid (pH 6.5); clear wavy boundary. (0 to 18 cm thick)

2C1--64 to 81 cm; 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 gravel; moderately acid (pH 6.0); gradual wavy boundary. (18 to 36 cm thick)

2C2--81 to 157 cm; 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 gravel; moderately acid (pH 6.0).

TYPE LOCATION: Benewah County, Idaho; about 1.5 miles west of Pettis Peak, about 150 meters south and 245 meters 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, 24 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 - 3.9 to 7.2 degrees C
Average summer soil temperature - 8.9 to 10.0 degrees C with an O horizon.
Depth to bedrock - greater than 150 cm
Solum thickness - 45 to 71 cm
Volcanic ash mantle - 35 to 50 cm
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 dry or moist
Value - 5 or 6 dry and 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - ashy silt loam or ashy loam
Clay content - 3 to 9 percent
Rock fragments - 0 to 10 percent gravel
Bulk density - 0.65 to 0.85 g/cc
Reaction - pH 5.6 to 7.3

Bw horizons
Hue - 10YR or 7.5YR dry or moist
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 to 6 dry or moist
Texture - ashy silt loam or ashy loam
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 - pH 5.6 to 7.3

2BC horizon
Value - 6 to 8 dry and 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - loamy sand, loamy coarse sand, coarse sand, or sandy loam
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 - pH 5.6 to 6.5

2C horizon
Hue - Variegated or 10YR or 2.5Y dry or moist
Value - 6 to 8 dry and 4 to 7 moist
Chroma - 3 to 6 dry or moist
Texture - loamy sand, loamy coarse sand, or coarse sand
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 - pH 4.5 to 6.0

COMPETING SERIES:
Cosho (WA) - are moderately deep to a lithic contact
Hysing (WA) - are deep to a paralithic contact

GEOGRAPHIC SETTING:
Landform - hillslopes and mountain slopes
Elevation - 490 to 1,675 meters
Aspect - all aspects
Slopes - 15 to 65 percent
Parent material - volcanic ash over residuum weathered from gneiss or granitic bedrock
Mean annual precipitation - 750 to 1,650 mm.
Mean annual temperature - 3.3 to 7.2 degrees C.
Frost-free period - 50 to 110 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bouldercreek, Floodwood, 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 saturated hydraulic conductivity in the solum and very rapid saturated hydraulic conductivity 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-Solomon's 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 43A.

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

SERIES ESTABLISHED: Benewah County, Idaho, 1975.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone 0 to 10 cm (Oi, Oe, A horizons)
Cambic horizon - the zone from 10 to 46 cm (Bw1, Bw2 horizons)
Volcanic ash mantle - the zone from 5 to 46 cm (A, Bw1, Bw2 horizons)
Particle-size control section - the zone from 5 to 105 cm (A, Bw1, Bw2, 2BC, 2C1, 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.

Additional Comments: These soils were formerly classified as medial over sandy or sandy-skeletal, mixed, frigid Typic Vitrandepts.

National Cooperative Soil Survey
U.S.A.