LOCATION HUNTIMER SDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Udertic Haplustolls
TYPICAL PEDON: Huntimer silty clay loam - on an east-facing slope of 1 percent in a cultivated field. When described the soil was moist to 12 inches. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark gray (10YR 3/1) moist; moderate fine angular blocky structure parting to weak fine granular; very hard, friable, slightly sticky and slightly plastic; common very fine to medium roots; common medium vesicular pores; neutral; clear smooth boundary. ( 7 to 10 inches thick)
Bw1--7 to 12 inches; dark grayish brown (10YR 4/2) silty clay, very dark gray (10YR 3/1) moist; moderate medium prismatic structure parting to moderate fine subangular blocky; hard, firm, sticky and plastic; common very fine to medium roots; common medium tubular pores; few discontinuous pressure faces; neutral; clear wavy boundary.
Bw2--12 to 18 inches; brown (10YR 5/3) silty clay, dark grayish brown (10YR 4/2) moist; moderate medium prismatic structure parting to moderate fine subangular blocky; hard, firm, sticky and plastic; common very fine to medium roots; common very fine tubular pores; few distinct discontinuous black (10YR 2/1), moist, coats on vertical faces of peds and few discontinuous pressure faces; neutral; clear irregular boundary. (Combined thickness of the Bw horizon is 7 to 18 inches)
Bk1--18 to 26 inches; light olive brown (2.5Y 5/3) silty clay loam, olive brown (2.5Y 4/3) moist; common fine and medium prominent strong brown (7.5YR 4/6) moist and few fine faint gray (10YR 6/1) moist mottles; moderate medium prismatic structure parting to moderate fine subangular blocky; hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular pores; 6 percent calcium carbonate equivalent; very few distinct discontinuous very dark grayish brown (10YR 3/2), moist, coats on vertical faces of peds; common medium and coarse rounded soft masses of carbonate and few fine rounded carbonate concretions; strongly effervescent; slightly alkaline; gradual wavy boundary.
Bk2--26 to 38 inches; light yellowish brown (2.5Y 6/3) silty clay loam, light olive brown (2.5Y 5/3) moist; common fine and medium prominent brown (7.5YR 4/4) moist and common fine and medium gray (10YR 5/1) moist mottles; moderate medium prismatic structure parting to moderate fine angular blocky; hard, firm, slightly sticky and slightly plastic; few fine roots; common very fine tubular pores; 8 percent calcium carbonate equivalent; common medium and coarse rounded soft masses of carbonate and few fine rounded carbonate concretions; strongly effervescent; moderately alkaline; gradual wavy boundary. (Combined thickness of the Bk horizon is 15 to 30 inches)
C1--38 to 50 inches; light brownish gray (2.5Y 6/2) silty clay loam, grayish brown (2.5Y 5/2) moist; common fine and medium prominent strong brown (7.5YR 4/6) moist redox concentrations and common medium faint gray (10YR 5/1) moist redox depletions; moderate medium angular blocky structure; very hard, firm, slightly sticky and slightly plastic; common very fine tubular pores; varved; 8 percent calcium carbonate equivalent; very few prominent discontinuous black (10YR 2/1), moist, manganese or iron-manganese stains; common fine and medium rounded soft masses of carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary.
C2--50 to 60 inches; light gray (2.5Y 7/1) silty clay loam, gray (2.5Y 5/1) moist; common fine and medium prominent strong brown (7.5YR 4/6) moist redox concentrations and common medium faint gray (10YR 5/1) moist redox depletions; massive; very hard, firm, slightly sticky and slightly plastic; common very fine tubular pores; varved; 8 percent calcium carbonate equivalent; very few prominent patchy very dark brown (10YR 2/2), moist, manganese or iron-manganese stains; common fine and medium rounded soft masses of carbonate and few coarse cylindrical iron concretions; strongly effervescent; moderately alkaline; gradual smooth boundary.
C3--60 to 80 inches; light gray (2.5Y 7/2) silty clay loam, grayish brown (2.5Y 5/2) moist; common fine and medium prominent strong brown (7.5YR 4/6) moist, common fine and medium prominent dark brown (7.5YR 3/4) moist redox concentrations, and many fine and coarse faint gray (2.5Y 6/1) moist redox depletions; massive; very hard, firm, slightly sticky and slightly plastic; common very fine and fine tubular pores; varves of silt loam and fine sand; 7 percent calcium carbonate equivalent; few prominent continuous dark brown (7.5YR 3/4), moist, iron stains in root channels and/or pores; common coarse cylindrical iron concretions; strongly effervescent; 1 percent subrounded mixed gravel; moderately alkaline.
TYPE LOCATION: Minnehaha County, South Dakota; about 9 miles west and 1 mile north of Colton; 192 feet south and 415 feet west of the northeast corner of sec. 19, T. 104 N., R. 52 W. USGS Buffalo Trading Post, SD topographic quadrangle; lat. 43 degrees 48 minutes 16 seconds N. and long. 97 degrees 6 minutes 39 seconds W. NAD 27.
RANGE IN CHARACTERISTICS: The depth to carbonates typically is from 14 to 20 inches and ranges from 14 to 30 inches. The control section averages between 35 and 50 percent clay and contains less than 15 percent fine sand or coarser. Maximum clay content is in the A horizon or in the upper part of the B horizon and decreases with depth. The mollic epipedon ranges from 10 to 20 inches thick and extends into the Bw horizon.
The A horizon has hue of 10YR, value of 3 or 4 and 2 or 3, and chroma of 1 or 2. It typically is silty clay loam, but in some pedons it is silty clay. It ranges from moderately acid to neutral.
The Bw horizon has hue of 10YR or 2.5Y, value of 3 to 5 and 2 to 4 moist, and chroma of 1 to 3. Typically, dark colored tongues of A horizon extend into the Bw horizon to depths of 20 to 36 inches. It ranges from slightly acid to slightly alkaline.
The Bk horizon has hue of 10YR or 2.5Y, value of 5 to 7 and 4 or 5 moist, and chroma of 2 to 4. It typically has few to many, distinct or prominent mottles. It is silty clay or silty clay loam. It has few to many accumulation of carbonate. It is slightly or moderately alkaline.
The C horizon has hue of 2.5Y or 5Y, value of 5 to 7 and 4 or 5 moist, and chroma of 1 to 4. It has few to many, fine to coarse accumulations of carbonates. It typically is silty clay loam or silt loam, but some pedons contain thin strata of sandy material. Stratified silt and sand or firm clay loam glacial till is at depths of 40 and 60 inches in some pedons. Some pedons are distinctly laminated. The C horizon is slightly or moderately alkaline.
COMPETING SERIES: These are the Benclare, Corson, Rosehill, and Sutphen series. Benclare soils have a mollic epipedon greater than 20 inches thick. Corson soils average more than 50 percent clay in the series control section and have formed in lacustrine or loess deposits on dissected uplands. Rosehill soils have a paralithic contact with clayey shale at a depth of 20 to 40 inches. Sutphen soils receive more precipitation and have a mollic epipedon 24 to 48 inches thick.
GEOGRAPHIC SETTING: Huntimer soils are on nearly level to gently sloping uplands having plane and convex surfaces with slope gradients of less than 6 percent. The soil formed in clayey glaciolacustrine sediment of ice-locked lakes. The mean annual temperature ranges from 48 to 52 degrees F, and mean annual precipitation from 20 to 26 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Egan, Moody, Nora, Wentworth, and Tetonka soils. All except Tetonka are on adjacent slopes and typically are at a lower elevation in the landscape than the Huntimer soils. The Tetonka soils are in depressions and have an argillic horizon and are wetter. Egan, Moody, Nora, and Wentworth soils have a fine-silty control section.
DRAINAGE AND PERMEABILITY: Well drained and moderately well drained. Runoff is medium or high. Permeability is moderately slow or slow.
USE AND VEGETATION: Mostly cropped to corn, soybeans, small grain, and alfalfa. Native grasses are little bluestem, big bluestem, needlegrass, sideoats grama, blue grama, sedges, and forbs.
DISTRIBUTION AND EXTENT: Southeastern South Dakota. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Lincoln County, South Dakota, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface of the soil to a depth of about 12 inches (Ap, Bw1 horizons); vertic properties - a linear extensibility of more than 6.0 in the upper 100 cm.