LOCATION TROSKY MN+SDEstablished Series
TAXONOMIC CLASS: Fine-silty over sandy or sandy-skeletal, mixed, superactive, calcareous, frigid Typic Endoaquolls
TYPICAL PEDON: Trosky silty clay loam on a 1 percent slope in a cropped field. (Colors are for moist soil unless otherwise indicated.)
Ap--0 to 8 inches; black (N 2/0) silty clay loam, very dark gray (10YR 3/1) dry; weak fine subangular blocky structure; friable; slightly effervescent; slightly alkaline; abrupt smooth boundary. (5 to 9 inches thick)
A--8 to 14 inches; black (N 2/0) silty clay loam, very dark gray (10YR 3/1) dry; moderate very fine subangular blocky structure; friable; slightly effervescence; slightly alkaline; clear smooth boundary. (4 to 12 inches thick)
AB--14 to 20 inches; very dark gray (N 3/0) and dark gray (5Y 4/1) silty clay loam, dark gray (2.5Y 4/1) and gray (5Y 5/1) dry; weak very fine subangular blocky structure; friable; slightly effervescent; moderately alkaline; clear irregular boundary. (4 to 10 inches thick)
Bg1--20 to 28 inches; olive (5Y 5/3) silty clay loam; weak fine and medium subangular blocky structure; friable; few fine distinct light olive brown (2.5Y 5/6) redoximorphic concentrations; strongly effervescent; moderately alkaline; gradual smooth boundary. (5 to 10 inches thick)
Bg2--28 to 38 inches; olive gray (5Y 5/2) silty clay loam; weak very fine and fine subangular blocky structure; friable; few medium distinct light olive brown (2.5Y 5/6) redoximorphic concentrations; slightly effervescent; moderately alkaline; clear smooth boundary. (0-14 inches thick)
2Cg1--38 to 62 inches; olive gray (5Y 5/2) and light olive gray (5Y 6/2) gravelly loamy coarse sand; single grain; loose; common medium distinct yellowish brown (10YR 5/4) redoximorphic concentrations; slightly effervescent; moderately alkaline; gradual smooth boundry.
2Cg2--62 to 80 inches; olive gray (5Y 5/2) and light olive gray (5Y 6/2) loamy coarse sand; single grained; loose; common medium distinct yellowish brown (10YR 5/4) redoximorphic concentrations; slightly effervescent; moderately alkaline.
TYPE LOCATION: Pipestone County, Minnesota; about 2 miles north and 3 miles west of, Pipestone Minnesota; 40 feet north and 1250 feet east of the northwest quarter of sec. 28, T. 107 N., R. 46 W. USGS Elkton, SW quadrangle, latitude 44 degrees, 2 minutes, and 42.9 seconds, W. longitude 96 degrees 22 minutes and 57.7 seconds N., NAD 83.
RANGE IN CHARACTERISTICS: Free carbonates typically are in all horizons but in some pedons the upper 10 inches or less of the A horizon lack free carbonates. Thickness of the mollic epipedon is 14 to 24 inches. The depth to the 2C horizon range from 24 to 40 inches. Calcium carbonate equivalent of the A horizon and the upper part of the B horizon is less than 15 percent, but larger amounts are in the lower part of the B horizon in some pedons. The 2C horizon has 10 to 40 percent by gravel of mixed lithology. The A and B horizons typically lack gravel. However, in some pedons the horizon above the 2C horizon contains as much as 10 percent gravel. Between depths of 10 inches and the top of the 2C horizon the soil averages between 22 and 35 percent clay and less than 15 percent--typically less than 10 percent fine sand and coarser.
The A horizon has a hue of 10YR, 2.5Y, or 5Y, value of 2 or 3, and chroma of 1, or is N 2/0 or N 3/0. Redoximorphic concentrations are in this horizon in some pedons. It typically is a silty clay loam but silt loam is included in the range. The reaction ranges from neutral to moderately alkaline.
The B horizon has a matrix of 2.5Y or 5Y, value of 4 through 6, and chroma of 1 through 3. Redox depletions range from distinct to prominent. The B horizon typically is silty clay loam but silt loam is included in the range. Also, the lower few inches of this horizon in some pedons is sandy loam, loam, or clay loam. The reaction ranges from mildly to moderately alkaline.
The 2C horizon has hue of 2.5Y or 5Y, value of 5 or 6, and chroma of 1 or 2. It commonly has redoximorphic features. It typically is coarse sand, gravelly coarse sand, loamy coarse sand, or gravelly loamy coarse sand, but some pedons have a thin C1 horizon that is sandy loam, loam, silt loam, silty clay loam, or clay loam. The C horizon ranges from mildly to moderately alkaline.
COMPETING SERIES: No other series is in this family.
GEOGRAPHIC SETTING: These soils typically are on plain positions, and less commonly on slightly convex or slightly concave outwash plains and valley trains. Slope gradient is less than 2 percent. Trosky soils formed in 24 to 40 inches of silty aeolian or glaciofluvial deposits that are underlain by glacial outwash sand and gravel. These materials primarily were deposited during the pre-Cary substage of the Wisconsinan glaciation. Mean annual temperature is about 38 to 45 degrees F, and mean annual precipitation is about 19 to 27 inches. The frost free period ranges from 120 to 170 days. Elevation ranges from 890 to 1950 feet above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Estelline soils. The Estelline soils are well drained and formed in materials similar to the Trosky soils.
DRAINAGE AND PERMEABILITY: Poorly drained. Surface runoff is slow or very slow. Permeability is moderate or moderately slow in the upper mantle and rapid in the underlying sand and gravel. The apparent seasonal high water table is at .5 to 1.5 feet and some time during the months of March to May in normal years.
USE AND VEGETATION: Most of this soil is cropped to corn or soybeans. Some areas are in pasture. Native vegetation was a wet association of the tall grass prairie.
DISTRIBUTION AND EXTENT: LRR M. MLRA-102A encompassing parts of southwestern Minnesota and possibly northeastern South Dakota. Moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Pipestone County, Minnesota, 1971.
REMARKS: This series was classified as a Humic-Gley in the former system. Classification only was changed 5/94. Refer to MAES Central File Code No. 1085 for results of some laboratory analysis of the typifying pedon. Diagnostic horizons recognized in this pedon are: mollic epipedon- the zone from the surface to 20 inches (Ap, A, AB horizons); cambic horizon- the zone from 20 to 38 inches (Bg1, Bg2 horizons); udic moisture regime.