LOCATION SWANNER                 ID+NV WY

Established Series
Rev. TAM/RWW/GHL
02/2011

SWANNER SERIES

The Swanner series consists of shallow, well drained soils that formed in loess and silty alluvium and material weathered from rhyolite, andesite and other igneous rocks. They are on mountain slopes and ridges and have slopes of 0 to 80 percent. The mean annual precipitation is about 14 inches and the mean annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Haploxerolls

TYPICAL PEDON: Swanner extremely stony loam, rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 6 inches; grayish brown (10YR 5/2) extremely stony loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine pores; slightly alkaline (pH 7.4); clear wavy boundary. (4 to 7 inches thick)

Bw--6 to 10 inches; brown (10YR 5/3) very stony loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots matted on top of rock fragments; many very fine tubular pores; many very fine and fine tubular pores; moderately alkaline (pH 7.9); clear wavy boundary. (4 to 8 inches thick)

Bk--10 to 16 inches; light yellowish brown (10YR 6/4) extremely stony loam, brown (10YR 4/3) moist; weak coarse prismatic structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine tubular pores; violently effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (2 to 9 inches thick)

2R--16 inches; pinkish gray (5YR 6/2) rhyolite or rhyolitic tuff bedrock with coatings of carbonate on rock surfaces.

TYPE LOCATION: Madison County, Idaho; about 2.5 miles east of Lyman; 1,520 feet north and 275 feet west of the southeast corner of section 28, T. 5 N., R. 40 E.

RANGE IN CHARACTERISTICS:

Thickness of mollic epipedon - 6 to 17 inches
Depth to bedrock - 10 to 20 inches
Rock fragments in the control section - 35 to 80 percent
Mean annual soil temperature - 40 to 47 degrees F

A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Reaction - neutral through moderately alkaline

Bw horizon
Value - 4 or 5 dry, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Clay content - 12 to 22 percent
Reaction - slightly alkaline or moderately alkaline
Rock fragments - 50 to 80 percent
Texture - STV-L, STX-L

Bk horizon where present
Value - 6 or 7 dry
Value - 4 or 5 moist
Chroma - 2 through 4 dry or moist
Clay content - 12 to 22 percent
Reaction - slightly alkaline or moderately alkaline
Rock fragments - 50 to 80 percent
Texture - STV-L, STX-L

COMPETING SERIES: These are the Agassiz, Anatone, Bocker, Cedaran, Falula, Foxol, Little Pole, Rexmont, and Van Wagoner series. The Agassiz soils are somewhat excessively or excessively drained. The Anatone and Bocker soils have hue of redder than 10YR in the B horizons. The Cedaran and Little Pole soils lack lime. Falula soils have hue of 7.5YR or redder. Foxol soils lack lime and have B horizons that are slightly or medium acid. Rexmont soils lack horizons of secondary carbonate accumulation. Van Wagoner soils lack lime and are neutral to medium acid in the lower part of the profile.

GEOGRAPHIC SETTING: Swanner soils are on mountain slopes and ridges. Slopes are 0 to 80 percent. They formed in loess and silty alluvium and material weathered from andesite and other igneous rocks. The mean annual precipitation 12 to 16 inches and the mean annual temperature is 39 to 45 degrees F. Frost-free season is 70 to 110 days. Elevation is 4,500 to 7,000 feet.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Araveton, Ard, Hondoho, Rammel, Tetonia, and Watercanyon () soils. The Araveton, Ard, Hondoho, and Watercanyon soils lack lithic contact. Tetonia and Watercanyon soils formed in deep loess and are coarse-silty. Araveton soils are on footslopes below the Swanner soils. Tetonia soils are on loess mantled uplands above the Swanner soils. Ard and Rammel soils are on mountain slopes where the overlying mantel is thicker. The Watercanyon soils dominantly are on south and west-facing slopes of mountains and foothills where associated with Swanner. Hondoho soils are on east-facing concave slopes and lower west-facing convex slopes where associated with Swanner.

DRAINAGE AND PERMEABILITY: Well drained; runoff is slow to very rapid; permeability is moderate.

USE AND VEGETATION: The Swanner series is used mainly for grazing. The potential natural vegetation is mainly low sagebrush and bluebunch wheatgrass.

DISTRIBUTION AND EXTENT: Southeastern Idaho. This series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Teton County, Idaho, 1972.

REMARKS: In 2/2011 the type location was moved from Teton County, Idaho to Madison County, Idaho. The extensive revision of the terton Soil Survey no longer recognized Swanner as a soil series in the survey area.

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National Cooperative Soil Survey
U.S.A.