LOCATION ROLLINGSTONE MN+IAEstablished Series
TAXONOMIC CLASS: Very-fine, mixed, active, mesic Typic Paleudalfs
TYPICAL PEDON: Rollingstone silt loam with a 15 percent convex south-facing slope in the uplands in a hay field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak very fine subangular blocky structure; friable; slightly acid; clear smooth boundary. (5 to 9 inches thick)
BE--6 to 13 inches; dark yellowish brown (10YR 4/4) silt loam, yellowish brown (10YR 5/4) dry; moderate fine subangular blocky structure; slightly hard, friable; medium acid; clear smooth boundary. (0 to 10 inches thick)
2Bt1--13 to 25 inches; red (2.5YR 4/6) gravelly clay; strong fine angular blocky structure; very firm; common moderately thick reddish brown (5YR 4/4) and yellowish red (5YR 4/6) clay films on faces of peds and in pores; about 25 percent angular chert gravel; strongly acid; gradual smooth boundary.
2Bt2--25 to 40 inches; red (2.5YR 4/6) gravelly clay; strong coarse prismatic structure parting to strong coarse and medium angular blocky; very firm; continuous thick reddish brown (5YR 4/4) clay films on faces of peds and in pores; about 30 percent angular chert gravel; strongly acid; gradual smooth boundary.
2Bt3--40 to 66 inches; red (2.5YR 4/6) gravelly clay; strong very coarse prismatic structure parting to strong coarse angular blocky; very firm; continuous thick reddish brown (5YR 4/4) clay films on faces of peds and in pores; about 25 percent angular chert gravel; strongly acid.
TYPE LOCATION: Houston County, Minnesota; about 2.5 miles west of LaCrescent; 2,000 feet east and 1,200 feet north of the SW corner, sec. 7, T. 104 N., R 4 W.
RANGE IN CHARACTERISTICS: Thickness of the solum and depth to free carbonates ranges from 60 to 90 inches or more. Depth to dolomite bedrock is typically 60 to 90 inches, but ranges to 120 inches or more. The loess is 5 to 15 inches thick. The content of chert gravel is less than 5 percent in the A and BA horizons and 10 to 35 percent in the 2B horizon. The Ap horizon or its equivalent has value of 3 or 4 moist, 6 or 7 dry and chroma of 2 or 3. The A horizon, which ranges from 1 to 4 inches in thickness, has hue of 10YR, value of 3 or 4, and chroma of 2 or 3. Some pedons have an E horizon as much as 4 inches in thickness. It has 10YR hue, value of 4 or 5, and chroma of 2 or 3. The A and E horizons are medium acid through neutral.
The BA horizon has chroma of 3 or 4. It is slightly acid through strongly acid.
The 2B horizon ranges from 2.5YR to 7.5YR hue. It has value and chroma of 4 through 6, but chroma of more than 4 is dominant in at least the lower part of the argillic horizon. It has 60 to 80 percent clay. It has medium through very coarse angular blocky or prismatic primary structure. It is firm or very firm and strongly or very strongly acid.
A cobbly or gravelly clay loam or loam 3B or 3C horizon that is 1 to 2 feet thick is in many pedons where slope gradient is more than 12 percent. Such horizons contain 40 to 80 percent coarse fragments. These fragments are mostly dolomite.
COMPETING SERIES: These are the Gepp, Oaklet, and Swimley series. Similar soils are the Dodgeville, Dubuque, Dunbarton, Lamoille, NewGlarus, Southridge, and Valton soils. Gepp, Oaklet, and Swimley soils have more than 35 percent clay in the upper part of the control section, and are more moist in the soil moisture control section during the 120 days following the summer solstice. Dodgeville, Dubuque, Dunbarton, and NewGlarus soils have bedrock beginning within depths of 40 inches. Lamoille soils contain less clay. Southridge soils are fine-silty over clayey. Valton soils are fine-silty.
GEOGRAPHIC SETTING: Rollingstone soils have convex slopes on ridgetops and side slopes of dissected uplands. Slopes range from 3 to 20 percent. These soils formed in 5 to 15 inches of loess and thick clayey pedisediments or residuum from dolomite. Mean annual temperature is 47 to 52 degrees F, and mean annual precipitation is 28 to 34 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: The principal soils are Lamoille, Nodine, Seaton, and Southridge series. Lamoille soils are downslope where the residuum is thinner. Nodine and Southridge soils are on similar positions but Nodine soils have a loamy 2B horizon and Southridge soils have a thicker loess mantle. Seaton soils are typically upslope where the loess mantle is thicker.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to very rapid. Permeability is slow.
USE AND VEGETATION: Corn, small grain, and legume hay are the principal crops on the less sloping area. Steeper areas are in pasture or woodland. Native vegetation was deciduous forest.
DISTRIBUTION AND EXTENT: Southeastern Minnesota, and possibly northeastern Iowa, southwestern Wisconsin, and northwestern Illinois. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Houston County, Minnesota, 1981.
REMARKS: These soils were formerly mapped Dubuque, shallow phase. Diagnostic horizons and features recognized in this soil are: ochric epipedon-the zone from the surface to 6 inches: argillic horizon-the zone of clay accumulation at 13 to 66 inches: paleo feature- hues of 2.5YR in the major part of the argillic horizon and does not have a decrease of 20 percent from the clay maximum within a depth of 1.25 meters.