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Published in Soil Sci Soc Am J 32:393-398 (1968)
© 1968 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Genesis Study of a Lithologic Discontinuity in Glacial Drift in Western Wisconsin1

J. E. Foss and R. H. Rust2

ABSTRACT

A study was made of soils developed in superposed parent materials in St. Croix and Pierce counties, Wisconsin. A typical stratigraphic sequence in this area consists of: (i) post-Cary loess, (ii) Cary till or mixed zone (14,000 years B.P.), (iii) Rockian till (30,000 years B.P.), and (iv) Paleozoic sedimentary rocks. The Cary drift is thin over much of the uplands in this area; thus, current soil profiles are developed in both the Cary and Rockian drifts. Morphological data indicate the presence of a paleosol on the Rockian till. This was substantiated by various physical, chemical, and mineralogical analyses. Characteristics of the paleosol include the accumulation of clay in the B horizon, translocated iron, and a strongly leached solum. The CaO/ZrO2 and Fe2O3/ZrO2 molar ratios of selected size fractions also indicate a weathering interval between deposition of the Cary and Rockian sediments. Clay-mineral analyses showed variation in lithology and weathering of the drifts.

NOTES

1 Contribution of Minnesota Agr. Exp. Sta. as Scientific Journal Series no. 6171. Presented before Div. S-5, Soil Science Society of America, Nov. 1965, at Columbus, Ohio.

2 Formerly Graduate Assistant, now Assistant Professor of Agronomy, University of Maryland, College Park, and Professor of Soil Science, University of Minnesota, St. Paul.

Received for publication April 17, 1967. Accepted for publication February 28, 1968.






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