LOCATION SOUTIN                  UT

Established Series
Rev. RSJ/MJD-JVC
12/2022

SOUTIN SERIES

The Soutin series consists of very deep, well drained soils that formed in alluvium derived from sedimentary rocks. Soutin soils are on fan remnants. Slopes are 2 to 5 percent. The mean annual precipitation is about 11 inches and the mean annual air temperature is about 47 degrees F.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Xeric Haplogypsids

TYPICAL PEDON: Soutin loam--rangeland. (Colors are for dry soil unless otherwise noted.)

Ay1--0 to 6 inches; light brown (7.5YR 6/4) loam, reddish brown (5YR 4/4) moist; weak thin platy structure; soft, friable, slightly sticky and slightly plastic; many fine and very fine roots; common fine and very fine random tubular and interstitial pores; few fine gypsum crystals (11 percent gypsum); strongly effervescent (13 percent calcium carbonate equivalent), carbonates are disseminated; slightly alkaline (pH 7.8); abrupt smooth boundary. (3 to 8 inches thick)

Ay2--6 to 10 inches; light brown (7.5YR 6/4) silt loam, reddish brown (5YR 4/4) moist; weak thick platy structure parting to weak very fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common fine and very fine roots; common fine and very fine random tubular pores; few fine gypsum filaments (2 percent gypsum); strongly effervescent (15 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 7.9); abrupt wavy boundary. (0 to 5 inches thick)

By1--10 to 15 inches; light brown (7.5YR 6/4) loam, reddish brown (5YR 4/4) moist; weak coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and very fine roots; many very fine, common fine and few medium random tubular pores; common fine gypsum filaments (2 percent gypsum); strongly effervescent (16 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 7.9); clear wavy boundary. (3 to 8 inches thick)

By2--15 to 27 inches; light brown (7.5YR 6/4) silt loam, reddish brown (5YR 4/4) moist; weak coarse subangular blocky structure parting to weak medium subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; few fine and very fine roots; common medium, fine and very fine random tubular pores; many fine gypsum filaments (4 percent gypsum); strongly effervescent (18 percent calcium carbonate equivalent), carbonates are disseminated; slightly alkaline (pH 7.8); gradual wavy boundary. (10 to 15 inches thick)

By3--27 to 37 inches; light brown (7.5YR 6/4) gypsiferous silt loam, reddish brown (5YR 4/4) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; many very fine, common fine and few medium random tubular pores; many fine gypsum filaments (17 percent gypsum); strongly effervescent (15 percent calcium carbonate equivalent), carbonates are disseminated; slightly alkaline (pH 7.8); gradual wavy boundary. (7 to 15 inches thick)

By4--37 to 48 inches; light brown (7.5YR 6/4) silt loam, reddish brown (5YR 4/4) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; many very fine, common fine and few medium random tubular pores; many fine and medium gypsum filaments (13 percent gypsum); strongly effervescent, (17 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 8.0); gradual wavy boundary. (7 to 12 inches thick)

BCy--48 to 60 inches; light brown (7.5YR 6/4) silt loam, reddish brown (5YR 4/4) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; few fine and very fine roots; common fine, many very fine and few medium pores; many fine gypsum filaments (10 percent gypsum); strongly effervescent (16 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 8.2).

TYPE LOCATION: Iron County, Utah; in Cedar City about 1.3 miles south of Center and Main Street; approximately 200 feet south and 2,600 feet east of the northwest corner of section 23, T. 36 S., R. 11 W; USGS Cedar City 7.5 minute topographic quadrangle; 37 degrees 39 minutes 45 seconds north latitude and 113 degrees 03 minutes 41 seconds west longitude, NAD27.

RANGE IN CHARACTERISTICS:

Soil moisture - The moisture regime is aridic bordering on xeric.

Mean annual soil temperature - 47 to 52 degrees F.

Mean summer soil temperature - 60 to 63 degrees F.

Depth to gypsic horizon - 20 to 40 inches.

Particle-size control section - Clay content: 18 to 27 percent;
Rock fragments: Less than 15 percent; Lithology of fragments is sandstone, shale, and conglomerate.


Ay horizons
Hue: 5YR or 7.5YR.
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4, dry or moist.
Texture: Loam or silt loam.
Gypsum content: 2 to 15 percent.
Reaction: Slightly alkaline or moderately alkaline.


By horizons
Hue: 5YR or 7.5YR.
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 2 through 6, dry or moist.
Texture: Silt loam, loam, silty clay loam, or clay loam; gypsiferous modifiers are present when gypsum content is 15 to 20 percent.
Gypsum content: 2 to 5 percent in the By1 and By2 horizons; 10 to 20 percent in the By3 and By4 horizons.
Reaction: Slightly alkaline or moderately alkaline.


BCy horizon
Hue: 5YR or 7.5YR.
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 2 through 6, dry or moist.
Texture: Silt loam, loam, silty clay loam, or clay loam.
Gypsum content: 5 to 15 percent.
Reaction: Moderately alkaline or strongly alkaline.

COMPETING SERIES: This is the Deseret series. Deseret soils are saturated with water for 90 or more days within a depth of 40 inches.

GEOGRAPHIC SETTING: Soutin soils are on fan remnants. These soils formed in alluvium derived from sedimentary rocks such as shale, sandstone, and conglomerate. Slopes are 2 to 5 percent. Elevations range from 5,700 to 5,900 feet. The mean annual precipitation is 10 to 12 inches. The mean annual air temperature is 45 to 50 degrees F. The frost-free period is 120 to 140 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ashdown and GraffPoint soils. Ashdown soils are fine-loamy. GraffPoint soils are loamy-skeletal.

DRAINAGE AND PERMEABILITY: Well drained; low surface runoff; moderate permeability (moderately high or high saturated hydraulic conductivity).

USE AND VEGETATION: Soutin soils are used for rangeland and urban development. Important plants are Wyoming big sagebrush, rabbitbrush, Indian ricegrass, and bottlebrush squirreltail.

DISTRIBUTION AND EXTENT: Southwestern Utah. These soils are not extensive with about 360 acres of the series mapped to date. MLRA 28A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.

SERIES ESTABLISHED: Iron County (Iron-Washington Area), Utah, 1997.

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

Ochric epipedon - The zone from the soil surface to 10 inches (Ay1 and Ay2 horizons).

Gypsic horizon - The zone from 27 to 60 inches (By3, By4, and BCy horizons).

Particle-size control section - The zone from 10 to 40 inches (By1, By2, and By3 horizons and part of the By4 horizons).


The cation exchange activity class is an estimate based on NASIS data.

ADDITIONAL DATA: The typical pedon at the series type location has partial characterization data by the Soil Survey Laboratory (SSL) as soil survey sample number 72UT021008 (pedon # 72C0126). Another pedon having partial data is soil survey sample number 72UT021009 (pedon # 72C0127).

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National Cooperative Soil Survey
U.S.A.