LOCATION GOSINTA IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Gosinta silt loam - on a creek bank cut next to a field of alfalfa hay at 4,300 feet elevation. When described on August 12, 1977, the soil profile was dry to 38 inches and slightly moist below. (Colors are for dry soil unless otherwise noted.)
A1--0 to 2 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate medium platy structure; hard, friable, slightly sticky and slightly plastic; many roots; few very fine tubular pores; neutral (pH 7.0); abrupt smooth boundary. (1 to 4 inches thick)
A2--2 to 8 inches; grayish brown (10YR 5/2) silt loam, black (10YR 2/1) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many roots; many very fine tubular pores; mildly alkaline (pH 7.4); gradual wavy boundary. (4 to 8 inches thick)
AB--8 to 24 inches; grayish brown (10YR 5/2) silt loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; many fine to coarse roots; many very fine tubular pores; strongly effervescent in places (5 percent calcium carbonate equivalent); mildly alkaline (pH 7.4); gradual wavy boundary. (12 to 18 inches thick)
Bw--24 to 38 inches; light brownish gray (10YR 6/2) loam, dark brown (10YR 3/3) moist; common, medium mottles, strong brown (7.5YR 5/6) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine tubular pores; neutral (pH 7.2); clear smooth boundary. (10 to 20 inches thick)
C1--38 to 50 inches; pale brown (10YR 6/3) sandy loam, very dark grayish brown (10YR 3/2) moist; common, medium to large mottles, strong brown (7.5YR 5/6) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; 10 percent gravel; neutral (pH 7.0); abrupt smooth boundary. (0 to 16 inches thick)
2C2--50to 65 inches; grayish brown (10YR 5/2) very gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; common, medium to large mottles, strong brown (7.5YR 5/6) moist; massive; slightly hard, friable; few very fine roots; few very fine irregular pores; 45 percent gravel; neutral (pH 7.0).
TYPE LOCATION: Twin Falls County, Idaho; about 3 miles south of Rock Creek, Idaho; in the northeast 1/4, southeast 1/4, southeast 1/4, sec. 11, T.12S., R.18E.
RANGE IN CHARACTERISTICS:
Depth to bedrock - more than 60 inches
Depth to high water table - 2 to 4 feet
Depth to mottles -24 to 60 inches
Thickness of the mollic epipedon -24 to 30 inches
Average clay content in control section average - 20 to 30 percent Average annual soil temperature - 49 to 52 degrees F.
A horizon
Color value, dry - 3 through 5
Chroma - 2 or 3 dry or moist
Reaction - neutral or mildly alkaline
Gravel - 0 to 10 percent
Bw and C1 horizons
Color value, dry - 5 or 6
Chroma - 2 through 4 dry or moist
Texture - L, SL, or CL
2C2 horizon
Color value, dry - 5 or 6
Chroma - 2 or 3
Texture - GRV-SL or GRV-L
Gravel - 35 to 55 percent
COMPETING SERIES: These are the Birdow, Blackrock, Coit, Dagor, Eastcan, Goose Creek, Lakeview, Monroe, Shoepeg (T), Soquel, and Willowdale series. Birdow, Blackrock Dagor, Lakeview and Monroe soils are well drained. Coit soils are poorly drained. Eastcan soils have mildly to strongly alkaline A horizons, and have an average annual soil temperature of 47 to 49 degrees F. Goose Creek soils have a control section which is dominantly silty clay loam. Soquel soils have an average annual soil temperature of 56 to 58 degrees F, and a frost-free season of 220 to 275 days. Shoepeg soils are somewhat poorly drained. Willowdale soils have 10 to 20 percent pumice.
GEOGRAPHIC SETTING: Gosinta soils are on alluvial terraces. The slope ranges from 0 to 2 percent. The soils formed in recent alluvium from mixed sources. Elevations are 3,000 to 5,000 feet. The average annual precipitation ranges from 10 to 12 inches. The average annual temperature is 47 to 50 degrees F. The frost free season is 110 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Escalante, Minveno, Nawt, Stricker, and Trevino soils. Escalante, Minveno, and Trevino soils occur on higher terraces. Escalante soils are coarse-loamy. Minveno soils are shallow to a hardpan. Trevino soils are shallow to basalt bedrock. Nawt and Stricker soils occur on breaks. Nawt soils are fine. Stricker soils are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Moderately well drained, slow runoff; moderately slow permeability.
USE AND VEGETATION: Gosinta soils are used for irrigated cropland and rangeland. Major crops grown are alfalfa for hay, barley, sweet corn, sugar beets, and wheat. Native vegetation is bluebunch wheatgrass, Sandberg bluegrass, basin wildrye, Thurber needlegrass, and basin big sagebrush.
DISTRIBUTION AND EXTENT: Gosinta soils are of small extent in south central Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Twin Falls County, Idaho, 1981. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - surface to 24 inches (A1, A2, and AB horizons)