LOCATION YECROSS SDEstablished Series
TAXONOMIC CLASS: Mixed, frigid Typic Ustipsamments
TYPICAL PEDON: Yecross loamy sand - on a slope of less than 1 percent in native grass. When described the soil was dry throughout. (Colors are for dry soil unless otherwise stated)
A1--0 to 8 inches; dark gray (10YR 4/1) loamy sand, very dark gray (10YR 3/1) moist; weak medium and fine granular structure; soft, very friable; many fine roots; neutral; clear wavy boundary. (5 to 10 inches thick)
C1--8 to 40 inches; brown (10YR 5/3) sand, brown (10YR 4/3) moist; single grained; loose; few fine roots in upper part; slight effervescence; slightly alkaline; gradual wavy boundary. (25 inches to several feet thick)
C2--40 to 60 inches; grayish brown (10YR 5/2) gravelly sand, dark grayish brown (10YR 4/2) moist; single grained; loose; about 15 percent by volume of rock fragments up to 1 inch in diameter; few rock fragments of shale; slight effervescence; moderately alkaline.
TYPE LOCATION: Campbell County, South Dakota; about 8 miles south and 4 miles east of Mound City; 1,245 feet north and 42 feet east of the southwest corner of sec. 27, T. 125 N., R. 76 W.
RANGE IN CHARACTERISTICS: Depth to carbonates typically is 8 to 10 inches but ranges from 0 to 20 inches. Colors with moist values of less than 3.5 extend below depths of 10 inches in some pedons but lack sufficient organic carbon to qualify for mollic epipedons.
The A horizon has hue of 10YR or 2.5Y, value of 4 or 5 and 2 or 3 moist, and chroma of 1 or 2 dry or moist. It is loamy sand, loamy fine sand, or sandy loam and is neutral or slightly alkaline.
The C horizon has hue of l0YR or 2.5Y, value of 5 to 7 and 4 to 6 moist, and chroma of 2 to 4 dry or moist. The control section ranges from loamy sand to coarse sand, of which more than 50 percent of the sand is medium or coarse. Coarse fragments range from 1 to 20 percent by volume. It is slightly alkaline or moderately alkaline. Thin layers of contrasting finer-textured material are below depths of 24 inches in some pedons as are thin buried A horizons.
COMPETING SERIES: These are the Beisigl, Blanchard, Kenray, Seroco and Zilditloi soils. Beisigl soils are moderately deep. Blanchard and Seroco soils contain less than 50 percent medium and coarser sand in the control section. In addition, Seroco soils do not have carbonates within depths of 30 inches. Kenray and Zilditloi soils are very deep to carbonates.
GEOGRAPHIC SETTING: The Yecross soils are on nearly level to strongly sloping uplands. Slope gradients are dominantly less than 6 percent but range from 0 to 15 percent. They formed in sandy glacial outwash sediments. Mean annual air temperature is 40 degrees to 45 degrees F., and mean annual precipitation ranges from 15 to l8 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lehr, Maddock, Tally, Wabek and Wyndmere soils. Lehr, Maddock and Wabek soils occupy similar positions in the landscape. Lehr soils have mollic epipedons and are fine-loamy over sandy or sandy-skeletal. Maddock soils have mollic epipedons. Wabek soils are sandy-skeletal. Tally soils are coarse-loamy and are on nearby landscapes. Wyndmere soils have calcic horizons and are in swales.
DRAINAGE AND PERMEABILITY: Excessively drained. Very slow runoff. Rapid permeability.
USE AND VEGETATION: Mainly used for rangeland, but some areas are farmed mainly to small grain. Native vegetation is sand bluestem, prairie sandreed, little bluestem, needleandthread, sand dropseed, blue grama, sedges and shrubs.
DISTRIBUTION AND EXTENT: North-central South Dakota and adjoining parts of North Dakota. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Walworth County, South Dakota, 4/75.