LOCATION TANNER ID

Established Series
Rev. DA/ALH/CLM
12/2019

TANNER SERIES

The Tanner series consists of soils that are well drained and moderately deep to a duripan. They formed in alluvium and loess from basalt and volcanic ash. They are on terraces, calderas and structural benches. Permeability is slow. Slopes range from 1 to 10 percent. The average annual precipitation is about 300 mm and the average annual temperature is about 6.7 degrees C.

TAXONOMIC CLASS: Fine, smectitic, frigid Argiduridic Durixerolls

TYPICAL PEDON: Tanner silt loam -- on a slope of 2 percent under rangeland vegetation at 1,710 meters elevation. When described on August 10, l982, the soil was dry throughout. (Colors are for air dry soil unless otherwise stated.)

A--0 to 8 cm; brown (10YR 5/3) silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many very fine tubular pores; neutral (pH 6.7); abrupt smooth boundary. (8 to 18 cm thick)

AB--8 to 18 cm; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine, fine and medium roots; many very fine tubular pores; slightly acid (pH 6.5); clear smooth boundary. (0 to 18 cm thick)

Bt1--18 to 41 cm; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; strong fine angular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine to medium roots; common very fine tubular pores; common distinct clay films on faces of peds and in pores; neutral (pH 6.6); gradual wavy boundary. (0 to 28 cm thick)

Bt2--41 to 56 cm; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; strong medium angular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine tubular pores; common distinct clay films on faces of peds and in pores; neutral (pH 6.9); gradual wavy boundary. (13 to 38 cm thick)

Bk--56 to 89 cm; very pale brown (10YR 8/3) gravelly loam, pale brown (10YR 6/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; 15 percent gravel and duripan fragments; violently effervescent (30 percent calcium carbonate); slightly alkaline (pH 7.6); abrupt smooth boundary. (13 to 43 cm thick)

Bkqm--89 to 130 cm; white (10YR 8/2) fractured indurated duripan, very pale brown (10YR 7/3) moist; massive; extremely hard, extremely firm; many 3 to 12 mm thick carbonate-silica cemented lenses mixed with basalt gravel and cobbles; fractures are 6 mm wide and 30 cm apart; violently effervescent; moderately alkaline (pH 8.2); abrupt smooth boundary. (8 to 76 cm thick)

2R--130 cm; dark gray (10YR 4/1) basalt; black (10YR 2/1) moist; carbonate coated and violently effervescent.

TYPE LOCATION: Twin Falls County, Idaho; about 20 miles west of Rogerson; about 2,200 feet north and 430 feet east of the southwest corner section 19, T. 14 S., R. 13 E.; USGS Cedar Creek Reservoir 7.5-minute topographic quadrangle; latitude XX degrees XX minutes XX seconds N and longitude YYY degrees YY minutes YY seconds W; WGS84 Decimal Degrees 42.1932778 latitude, -114.9885278 longitude.

RANGE IN CHARACTERISTICS:

Mollic epipedon thickness - 20 to 46 cm. Depth to calcium carbonates - 30 to 64 cm.
Depth to duripan - 50 to 100 cm.
Depth to bedrock - 40 to more than 60 inches
Particle-size control section - 35 to 45 percent clay
Average annual soil temperature - 6.7 to 8.3 degrees C.
Average summer soil temperature - 17.8 to 21.1 degrees C.
Soil moisture: Usually dry, moist winter and spring, dry summer and fall; xeric moisture regime that borders on aridic.

A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist

Bt1 horizon
Chroma - 2 or 3 dry or moist
Structure - subangular or angular blocky
Texture - Silty clay or clay loam
Clay content - 30 to 38 percent

Bt2 horizon
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 2 or 3 dry or moist
Texture - Silty clay, cobbly silty clay or gravelly silty clay.
Clay content - 40 to 48 percent
Gravel - 0 to 10 percent
Cobbles - 0 to 10 percent
Stones - 0 to 5 percent

Bk or Bkq horizon
Value - 6 through 8 dry, 4 through 7 moist
Chroma - 3 or 4 dry or moist
Texture - gravelly loam, loam, silty clay loam, or silt loam.
Clay content - 16 to 30 percent
Gravel - 5 to 20 percent
Cobbles - 0 to 5 percent
Reaction (pH) - mildly or moderately alkaline
Calcium carbonate equivalent - 15 to 30 percent

Bkqm horizon
Thickness of laminar cap - 12 to 25 mm.
Width of fractures - 3 to 25 mm
Distance between fractures - 25 to 60 cm.
Thickness of subsequent laminations - 2.5 to 5 cm
Cementation below cap - weak through strong

COMPETING SERIES: These are the Hodedo, Stampede, and Uana series. Stampede and Uana soils have a Bt horizon texture of clay or clay loam. Hodedo, and Stampede soils lack a calcic horizon. Uana soils have carbonate in the lower part of the argillic horizon.

GEOGRAPHIC SETTING: Tanner soils are on terraces, calderas and structural benches. The slopes range from 1 to 10 percent. The soils formed in alluvium and residuum from basalt, volcanic ash and loess. Elevations are 1,590 to 1,800 meters. The average annual precipitation ranges from 230 to 330 mm. The average annual temperature ranges from 5.6 to 7.8 degrees C. The frost free season is 75 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Budlewis, Chayson, Howcree, and Pigtail series. Budlewis soils occur on the same landscape and have an abrupt textural change between the A and B horizons. Chayson and Howcree soils occur on higher terraces. Chayson soils are fine-loamy. Howcree soils are very deep and clayey-skeletal. Pigtail soils occur on lower terraces and have an abrupt textural change between the A and B horizons.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; slow or medium runoff; slow saturated hydraulic conductivity.

USE AND VEGETATION: Tanner soils are used mainly for rangeland and wildlife habitat. The dominant natural vegetation is basin big sagebrush, Wyoming big sagebrush, bluebunch wheatgrass, western wheatgrass, and lupine.

DISTRIBUTION AND EXTENT: Tanner soils are of moderate extent in south central Idaho.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Twin Falls County, Idaho, l992.

REMARKS: Clay percent by hydrometer: 0 to 8 cm-22 percent; 8 to 18 cm-28 percent; 18 to 41 cm-34 percent; 41 to 56 cm-42 percent. Base saturation: 0 to 8 cm -75 percent; 8 to 18 cm 80 percent; 18 to 41 cm -82 percent; 41 to 56 cm-86 percent. Percent calcium carbonate: 56 to 89 cm-30 percent.

Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon - The zone from 0 to 41 cm (The A, AB and Bt1 horizons).
Argillic horizon - The zone from 18 to 56 cm (The Bt1 and Bt2 horizons).
Calcic horizon - The zone from 56 to 89 cm (The Bk).
Duripan - The zone from 89 to 130 cm (The Bkqm horizon).

National Cooperative Soil Survey
U.S.A.