LOCATION REDIG SDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Gypsic Haplustepts
TYPICAL PEDON: Redig clay loam - on a 6 percent west-facing slope in native grass. When described the soil was dry throughout. (Colors are for dry soil unless otherwise stated)
A1--0 to 3 inches; grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; weak fine granular structure; slightly hard, friable, slightly sticky; many fine roots; about 10 percent by volume of rock fragments; slight effervescence; neutral; clear smooth boundary. (2 to 5 inches thick)
A2--3 to 7 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky; many fine roots; about 12 percent by volume of rock fragments; strong effervescence; slightly alkaline; clear wavy boundary. (2 to 5 inches thick)
Cy1--7 to 18 inches; white (10YR 8/1) loam, pale brown (10YR 6/3) moist; massive; hard, friable, slightly sticky; common roots; about 10 percent by volume of rock fragments; many gypsum crystals; rock fragments are coated with carbonates; strong effervescence; slightly alkaline; gradual wavy boundary. (6 to 12 inches thick)
Cy2--18 to 30 inches; white (10YR 8/1) gravelly loam, light brownish gray (2.5Y 6/2) moist; massive; hard, friable, slightly sticky; few roots; about 20 percent by volume of rock fragments; many gypsum crystals; rock fragments are coated with carbonates; strong effervescence; slightly alkaline; clear wavy boundary. (10 to 15 inches thick)
Cy3--30 to 45 inches; light brownish gray (2.5Y 6/2) gravelly loam, light olive brown (2.5Y 5/3) moist; massive; slightly hard, friable, slightly sticky; about 30 percent by volume of rock fragments; many gypsum crystals; rock fragments are coated with carbonates; violent effervescence; slightly alkaline; gradual wavy boundary.
C--45 to 60 inches; light brownish gray (2.5Y 6/2) and light gray (2.5Y 7/2) gravelly clay loam, grayish brown (2.5Y 5/2) and light brownish gray (2.5Y 6/2) moist; many fine yellowish brown (10YR 5/6) redoximorphic concentrations; massive; soft, friable, slightly sticky; about 40 percent by volume of rock fragments; common gypsum crystals; rock fragments are coated with carbonates; violent effervescence; slightly alkaline.
TYPE LOCATION: Butte County, South Dakota; about 5 miles east and 4 miles north of Newell; 2,490 feet west and 700 feet south of the northeast corner of sec. 5, T. 9 N., R. 7 E.
RANGE IN CHARACTERISTICS: These soils typically are calcareous to the surface, but are leached to 2 to 4 inches in some pedons. The 10- to 40-inch control section is loam, clay loam or gravelly loam. It is estimated to contain from 18 to 35 percent clay. The amount of rock fragments ranges from 2 to 35 percent by volume throughout the 10- to 40-inch control section.
The A horizon has 10YR or 2.5Y hue, value of 4 to 6 and 3 to 5 moist, and chroma of 2 or 3. Where the color value is as dark or darker than 5.5 dry or 3.5 moist, the A horizon is too thin for a mollic epipedon. It is neutral or slightly alkaline. It commonly is clay loam or loam but is gravelly loam in some pedons.
The Ccs horizons have 10YR or 2.5Y hue, value of 6 to 8 and 5 to 7 moist, and chroma of 1 to 3. The Ccs horizons have an estimated 20 to 35 percent gypsum and 5 to 10 percent calcium carbonate equivalent. The C horizon below depths of 40 inches contains as much as 60 percent by volume of rock fragments in some pedons. The C horizon is slightly or moderately alkaline.
COMPETING SERIES: There are no series in the same family.
GEOGRAPHIC SETTING: Redig soils are on gently sloping to steep, convex surfaces where terrace deposits are remnants that cap ridges and upper slopes of undulating to rolling uplands. Slope gradients range from 6 to 25 percent. The soil formed in old alluvium containing sands, silts, clays, and rock fragments of mixed mineral origin. The mean annual air temperature ranges from 45 to 49 degrees F., and mean annual precipitation ranges from 10 to 15 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bidman, Nunn and Schamber soils. Bidman and Nunn soils have argillic horizons and are on adjacent tablelands. Schamber soils are on landscapes similar to the Redig soils. Schamber soils have more than 35 percent by volume of rock fragments throughout the series control section.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is low to high depending on slope. Permeability is moderate.
USE AND VEGETATION: These soils are used as rangeland. Native vegetation is blue grama, sedges, needlegrasses, western wheatgrass, fringed sagewort and cacti.
DISTRIBUTION AND EXTENT: Western South Dakota. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Butte County, South Dakota, 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon: Ochric epipedon - the zone from the surface of the soil to a depth of 7 inches (A1 and A2 horizons); Gypsic horizon - the zone from 7 to 45 inches (Cy1, Cy2 and Cy3 horizons).