LOCATION CHATTIN                 ID

Established Series
Rev. DT/AH/RWL
07/2012

CHATTIN SERIES

The Chattin series consists of very deep, well drained soils with moderately slow permeability that formed in silty alluvium from loess and weathered volcanic ash over loamy alluvium from basalt and volcanic ash. Slopes range from 0 to 4 percent on plains. The average annual precipitation is about 7 inches and the average annual temperature is about 54 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Calciargids

TYPICAL PEDON: Chattin silt loam -- on a nearly level lava flow trough at 2,830 feet elevation in rangeland. When described on June 10, 1999, the soil was dry throughout. (Colors are for air-dry soil unless otherwise stated.)

A1--0 to 2 inches; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; weak very fine platy structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine tubular and irregular pores; slightly effervescent (about 2 percent CaCO3); calcium carbonate is disseminated throughout the peds; moderately alkaline (pH 7.9); clear smooth boundary. (1 to 3 inches thick)

A2--2 to 5 inches; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; weak medium platy structure; slightly hard, very friable, nonsticky and nonplastic; common very fine roots; many very fine and fine tubular and irregular pores; moderately alkaline (pH 8.1); clear smooth boundary. (2 to 4 inches thick)

Bt--5 to 9 inches; pale brown (10YR 6/3) silt loam, brown (10YR 5/3) moist; weak coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; common very roots; common very fine, fine, and medium, few coarse tubular pores; about 1 percent gravel; few faint clay films on faces of peds; moderately alkaline (pH 8.4); abrupt smooth boundary. (4 to 7 inches thick)

2Bk--9 to 17 inches; pale brown (10YR 6/3) loam, brown (10YR 5/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; common very fine tubular pores; about 1 percent gravel; strongly effervescent (about 15 percent CaC03); calcium carbonate is disseminated throughout the peds; moderately alkaline (pH 8.1); clear smooth boundary. (5 to 20 inches thick)

2Btk1--17 to 23 inches; light yellowish brown (10YR 6/4) silty clay loam, brown (10YR 5/3) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine and fine, few course tubular pores; common distinct clay films on faces of peds and in pores; violently effervescent (about 25 percent CaC03); many large irregular shaped soft lime masses; moderately alkaline (pH 8.0); clear wavy boundary.

2Btk2--23 to 30 inches; very pale brown (10YR 7/3) silty clay loam, pale brown (10YR 6/3) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine and fine, few medium tubular pores; common faint clay films on faces of peds; violently effervescent (about 30 percent CaC03); many large irregular shaped soft lime masses; slightly alkaline (pH 7.7); clear smooth boundary. (combined Btkb horizon - 10 to 20 inches thick)

3C--30 to 60 inches; pale brown (10YR 6/3) sandy loam, brown (10YR 5/3) moist; massive; soft, very friable, nonsticky and nonplastic; about 5 percent gravel; violently effervescent (about 20 percent CaC03); calcium carbonate is disseminated throughout the peds; moderately saline (EC 8); slightly alkaline (pH 7.4).

TYPE LOCATION: Elmore County, Idaho; about 8.5 miles northeast of Grandview; 300 feet north and 1400 feet west of southeast corner of section 1, T.4 S., R.2 E.; USGS Jackass Butte Quadrangle; (Latitude - 43 degrees, 04 minutes, 03 seconds N. and Longitude - 116 degrees, 09 minutes, 36 seconds W.)

RANGE IN CHARACTERISTICS:
Average annual soil temperature - 54 to 56 degrees F.
Depth to bedrock - more than 60 inches
Depth to calcium carbonate - 0 to 5 inches
Depth to buried argillic horizon - 14 to 30 inches
Particle-size control section - 18 to 24 percent clay; 0 to 5 percent rock fragments
Reaction - slightly alkaline or moderately alkaline
Volcanic glass content - 2 to 15 percent Alox + 1/2 Feox - less than 0.2 percent
Moisture control section - dry for more than 180 days when the soil temperature is greater than 41 degrees F.

A horizon
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 or 3 dry or moist
Clay content - 7 to 12 percent
Rock fragments - 0 to 5 percent gravel
Calcium carbonate content - 0 to 3 percent

Bt horizon
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 through 4 dry or moist
Clay content - 18 to 24 percent
Rock fragments - 0 to 5 percent gravel

Bkb horizon
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Texture - SIL or L
Clay content - 10 to 18 percent
Rock fragments - 0 to 5 percent gravel
Calcium carbonate content - 15 to 30 percent

Btkb horizon
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - SIL or SICL
Clay content - 24 to 35 percent
Rock fragments - 0 to 5 percent gravel
Calcium carbonate content - 15 to 30 percent

2C horizon
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - SL, LS or FSL
Clay content - 2 to 10 percent
Rock fragments - 0 to 5 percent gravel
Calcium carbonate content - 15 to 30 percent
Salinity - slight or moderate

COMPETING SERIES: These are the Cataract, Grieta, Mack, Mesa, Neiber, Nannyton and Saddle series. The Cataract, Neiber and Saddle soils are 20 to 40 inches deep to lithic or paralithic contact and lack buried argillic horizons. The Grieta and Mack soils have textures in the argillic horizons that have greater than 35 percent fine sand or coarser and lack buried argillic horizons. Mesa soils have greater than 35 percent rock fragments in the Bk and C horizons and lack buried argillic horizons. Nannyton soils have sandy or sandy-skeletal textures above 40 inches and lack buried argillic horizons.

GEOGRAPHIC SETTING: Chattin soils are on lava flow troughs on shield volcanoes of plains. Elevation is 2,800 to 3,000 feet. Slopes range from 0 to 4 percent. These soils formed in silty alluvium from loess and weathered volcanic ash over loamy alluvium from basalt and volcanic ash. Average annual precipitation is 6 to 7 inches. Average annual temperature is 53 to 54 degrees F. The frost-free period is 150 to 160 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Tadpole (T) and Strike (T) soils. Tadpole and Strike soils have Bkq horizons with durinodes and lack fine-loamy argillic horizons. Landscape positions are similar.

DRAINAGE AND PERMEABILITY: Well drained; very slow to slow runoff; moderately slow permeability.

USE AND VEGETATION: Chattin soils are used mainly for rangeland. Natural vegetation is shadscale, bud sagebrush, Thurber needlegrass and Indian ricegrass.

DISTRIBUTION AND EXTENT: Ada and Elmore counties, Idaho; MLRA 11. These soils are of limited extent.

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

SERIES ESTABLISHED: Ada County, Idaho, 2012.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - zone from the surface to 5 inches (A1 and A2 horizons)

Argillic horizons - zones from 5 to 9 and 17 to 30 inches (Bt, 2Btk1 and 2Btk2 horizons)

Calcic horizon - zone from 9 to 30 inches (2Bk, 2Btk1 and 2Btk2 horizons)

Particle-size control section - zone from 5 to 40 inches

Soil moisture regime - aridic

The classification of this pedon has been revised as of 4/00 from coarse-silty to fine-loamy particle-size family class.

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National Cooperative Soil Survey
U.S.A.