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Weathering in Surface Horizons of Illinois Soils¹

ABSTRACT

Lines analogous to isohyets were drawn with respect to molar ratios of CaO, K₂O, and Fe₂O₃ to ZrO₂. The resulting maps demonstrate the close relationship of loess thickness to intensity of soil development and identify a north-south band of soils in southern Illinois that are the most intensely weathered soils in the state. The youngest or least developed soils identified by the lines occur in thick loess deposits of extreme northwestern Illinois. Isoweathering lines cannot be drawn in the area of Wisconsin drift because of the penecontemporaneity of loess on the drift and many local sources within the drift sheet area.

¹ Contribution of the Department of Agronomy, University of Illinois, Urbana. Published with approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. S-V, Soil Science Society of America, Columbus, Ohio, Nov. 4, 1965.

² Assistant Professor and Professor of Soil Mineralogy, respectively.

Received for publication January 10, 1966. Accepted for publication May 25, 1966.