LOCATION SELLE ID+MT

Established Series
Rev. PMH-SHB-RJS
05/2017

SELLE SERIES

The Selle series consists of very deep, well drained soils on dune-like glaciolacustrine terraces. They formed in sandy glaciolacustrine or shoreline sediments with minor amounts of volcanic ash in the surface layers. Permeability is moderately rapid in the upper part and rapid below. Slopes range from 0 to 12 percent. The average annual precipitation is about 750 mm, and average annual air temperature is about 6.1 degrees C.

TAXONOMIC CLASS: Sandy, mixed, frigid Vitrandic Dystrudepts

TYPICAL PEDON: Selle ashy fine sandy loam, forested; on a southeast-facing slope of 2 percent at 650 meters elevation. When described on July 23, 1970, the soil was slightly moist throughout. (Colors are for dry soil unless otherwise stated.)

Oi--0 to 1.5 cm; undecomposed needles and twigs. (1.5 to 5 cm thick)

Oe--1.5 to 5 cm; moderately decayed needles and twigs; matted; some fungi; very strongly acid (pH 5.0). (1.5 to 4 cm inches thick)

Oa--5 to 8 cm; dark gray (10YR 4/1) well decomposed organic matter; strongly acid (pH 5.4). (0 to 3 cm thick)

A--8 to 20 cm; yellowish brown (10YR 5/4) ashy fine sandy loam, dark yellowish brown (10YR 3/4) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine to coarse roots; many very fine irregular pores; moderately acid (pH 6.0); gradual smooth boundary. (3 to15 cm thick)

Bw1--20 to 43 cm; light yellowish brown (10YR 6/4) ashy fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine to coarse roots; common fine tubular and many very fine irregular pores; very few semi-hard manganese accumulations 2 to 3 mm. in diameter; moderately acid (pH 5.8); gradual smooth boundary.

Bw2--43 to 58 cm; light yellowish brown (10YR 6/4) ashy fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine to coarse roots; common fine and few medium tubular and many very fine irregular pores; very few black manganese concretions 1 to 2 mm. in diameter; moderately acid (pH 6.0); gradual smooth boundary. (combined thickness of Bw1, Bw2 horizons -- 25 to 75 cm)

E and Bt1--58 to 94 cm; light yellowish brown (10YR 6/4) loamy fine sand, dark yellowish brown (10YR 4/4) moist; massive; soft, friable, nonsticky and nonplastic; common very fine and fine roots; common fine tubular and many very fine irregular pores; few wavy discontinuous lamellae about 2 mm. thick; few dark brown soft iron accumulations 1 to 2 mm. in diameter; moderately acid (pH 6.0); gradual smooth boundary. (20 to 50 cm thick)

E and Bt2--94 to 122 cm; light yellowish brown (10YR 6/4) loamy fine sand, brown (10YR 4/3) moist; single grain; loose, nonsticky and nonplastic; few fine roots; common fine tubular and many very fine irregular pores; several wavy discontinuous clay bands about 2 mm. thick; few dark brown soft iron accumulations 1 to 2 mm. in diameter; moderately acid (pH 5.8); gradual smooth boundary. (0 to 48 cm thick)

E and Bt3--122 to 152 cm; light yellowish brown (10YR 6/4) loamy fine sand, olive brown (2.5Y 4/4) moist; single grain; loose, nonsticky and nonplastic; few very fine roots; few fine tubular and many very fine irregular pores; several wavy discontinuous clay bands about 2 mm. thick; few light gray splotches; few reddish brown soft iron accumulations 1 to 3 mm. in diameter; moderately acid (pH 5.8)

TYPE LOCATION: Bonner County, Idaho; behind Colburn school; about 354 meters south and 335 meters west of northeast corner of sec. 12, T. 58 N., R. 2 W.; Latitude - 48 degrees, 23 minutes, 50 seconds North; Longitude - 116 degrees, 31 minutes, 45 seconds West; NAD 83; USGS Colburn Quadrangle.

RANGE IN CHARACTERISTICS:
Moisture control section -- dry 15 to 35 days August to mid-September, moist mid-September through July; udic moisture regime
Mean annual soil temperature -- 6.1 to 7.8 degrees C.
Mean summer soil temperature - 15.0 to 17.2 degrees C. without an O horizon
Thin light gray volcanic ash layer (1980 Mt. St. Helens volcanic ash) -- .5 to 1 centimeter thick present in some pedons in undisturbed areas between the organic layers and mineral surface
Base saturation (by NH4OAc) -- 30 to 60 percent in upper 75 cm
Reaction -- moderately acid to neutral throughout

Volcanic ash
Thickness -- 20 to 60 cm
Volcanic glass content -- 5 to 20 percent
Acid-oxalate extractable Al + 1/2 Fe. -- 0.4 to 1.0 percent
Moist bulk density -- 1.0 to 1.2 g/cc
Phosphate retention -- 25 to 55 percent

A horizon
Value: 4 or 5 dry; 2 to 4 moist
Chroma: 1 to 4 dry or moist
Texture (less than 2 mm fraction): ashy fine sandy loam, ashy sandy loam
Clay content: 2 to 4 percent

Ap horizon (present in cultivated areas)
Thickness: 8 to 12 cm

Bw, Bw2 horizons
Hue: 10YR or 7.5YR dry or moist
Value: 5 to 7 dry; 3 or 4 moist
Chroma: 3 or 4 moist or dry
Texture (less than 2 mm fraction): ashy fine sandy loam, ashy sandy loam, loamy fine sand (in lower part of some pedons)
Clay content: 2 to 4 percent

E and Bt1, E and Bt2, E and Bt3 horizons
Hue: 10YR or 2.5Y dry or moist
Value: 5 to 7 dry; 3 to 5 moist
Chroma: 3 or 4 dry or moist
Texture: loamy fine sand, loamy sand, fine sand, sand
Clay content: 2 to 4 percent
Lamellae: 2 to 5 millimeters thick, 10YR or 7.5YR 5/4 or 5/6 dry, clay increase (absolute) less than 3 percent

C horizon - present in some pedons
Hue: 10YR or 2.5Y dry or moisst
Value: 6 or 7 dry; 4 or 5 moist
Chroma: 2 to 4 dry or moist
Texture: fine sand, sand
Clay content: 0 to 2 percent
Fine gravel: 0 to 5 percent

COMPETING SERIES:
Myrtlecreek (ID) -- does not have E and Bt horizons in the subsoil and has coarse sand textures in the substratum
Snowlake (ID) -- does not have E and Bt horizons in the subsoil and has more than 15 percent (by volume) gravel and coarse sand textures in the substratum

GEOGRAPHIC SETTING:
Landform: dune-like glaciolacustrine terraces
Elevation: 600 to 775 meters
Slope: 0 to 12 percent
Parent material: sandy glaciolacustrine or shoreline sediments with minor amounts of volcanic ash in the surface layers
Mean annual precipitation: 600 to 900 mm
Mean annual air temperature: 5.6 to 7.8 degrees C
Frost free period: 100 to 130 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Colburn, Elmira, Mission, and Rubson soils. Colburn soils are on low stream terraces and are somewhat poorly drained. Elmira soils are on dunes and are excessively drained and sandy. Mission soils are on terraces and have a fragipan. Rubson soils are on terraces and are coarse-silty.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; slow to very slow runoff; saturated hydraulic conductivity is high in the upper part and very high in the lower part.

USE AND VEGETATION: These soils are used mainly for timber production, grazing, recreation, and wildlife habitat. Some areas are cleared and used for small grains, hay, and pasture. Natural vegetation is mainly western redcedar, western larch, grand fir, western white pine, Douglas-fir, ponderosa pine, and lodgepole pine, with an understory of myrtle pachystima, American trailplant, piper anemone, elk sedge, Columbia brome, Oregon fairybells, violet, queencup beadlily, goldthread, and longtube twinflower.

DISTRIBUTION AND EXTENT: Northern Idaho, and northwestern Montana, and possibly northeastern Washington. These soils are moderately extensive. MLRA 44A.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Bonner County, Idaho, 1935.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon -- 0 to 20 cm (Oi, Oe, Oa, A horizons);
Cambic horizon -- 20 to 58 cm (Bw1, Bw2 horizons); and
Particle-size control section -- 33 to 108 cm (part of the Bw1, Bw2, E and Bt1, part of the E and Bt2 horizons).

Pedon meets Lamellic taxonomic subgroup criteria per 12th Edition Keys to Soil Taxonomy - the zone from 58 to 152 cm (E and Bt horizons). Currently, 12th Edition Keys to Soil Taxonomy does not recognize a Vitrandic Lamellic subgroup.

ADDITIONAL DATA: KSSL data available for this pedon; Soil Survey Sample Number: S1970ID017001 Bonner County, Idaho. KSSL Pedon Number: 70C008. Additional KSSL data available for Lab Pedon numbers: 94P0240, 98P0031 and 70C0009.

National Cooperative Soil Survey
U.S.A.