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redder hue. Theresa soils formed partly in loess and have 2C horizons with 40 to 60 <br />percent calcium carbonate. <br />GEOGRAPHIC SETTING: Hayden .soils have plane or conve.x slopes on gently <br />undulating through .steep glacial moraines of the Des Moines and Grantsburg sublobe of <br />the Late Wisconsinan glaciation. Their .slopes range from 2 to 40 percent and mostly arc <br />80 to 300 feet in length. These soils formed in calcareous loamy glacial till. <br />Montmorillonite is the dominant clay mineral in the glacial till. Mean annual temperature <br />is 45 to 50 degrees, and mean annual precipitation is 27 to 33 inches. <br />GEOCRAPHIC/VLLY ASSOCIATED SOILS: These are the Ames. Dundas . Hamel. <br />Luther, and Nes.sel soils which are members of a topo.sequence with the Hayden soils. <br />Moderately well drained Nessel soils have plane or slightly conve.x slopes. Poorly <br />drained Ames and Dundas soils have slightly concave to slightly convex slopes with <br />gradient of less than 2 percent. Poorly drained Hamel soils are on toe slopes. Organic <br />soils are common associates in some places. <br />DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium and rapid. <br />Permeability is moderate. <br />USE AND VEGETATION: Mostly cleared and cultivated to corn, soybeans, small <br />grain, and hay. Native vegetation was deciduous forest of m.aple. basswood, oak, and <br />elm. <br />DISTRIBUTION AND EXTENT: Southeastern Minnesota and in central Iowa. <br />Extensive. <br />MLRA OFFICE RESPONSIBLE; St. Paul, Minnesota <br />SERIES ESTABLISHED: Hennepin County, Minnesota. 1929. <br />ADDITIONAL DATA: Refer to Minnesota Agricultural Experiment Station Central <br />File Code No. 967 for results of some laboratory analysis of the typical pedon.