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Micromorphology of Polygenetic Soils in the Teays River Valley, Ohio¹

ABSTRACT

Soils in the preglacial Teays River Valley in Jackson County, Ohio, are polygenetic. Modern sola are developed in 50 to 60 cm of loess over loamy or silty colluvium which, in turn, overlies either weathered bedrock, old river alluvium, or thick lacustrine clay. Micromorphological observations of heterogeneous plasmic fabrics and embedded argillans and aggregates support the field identification of a paleosol developed in colluvium and buried hy loess. Abrupt changes in plasmic fahrics over short distances in thin section are interpreted to represent mixing of soil materials during colluviation. Compound argillans with varying degrees of orientation and disruption suggest that at least two periods of clay illuviation occurred. Discontinuous banding of plasma and silt particles suggests that the colluvium moved down valley walls during periods of solifiuction. We hypothesize that solifluction occurred about 18,000 RCYBP, when Wisconsinan ice had advanced to about 50 km northwest of the Teays Valley.

¹ Salaries and research support provided by state and federal funds appropriated to the Ohio Agric Res. and Dev. Ctr., The Ohio State Univ. Journal Article no. 135-82. Portions of this paper were presented before Div. S-5, Soil Sci. Soc. of Am., Detroit, on 1 Dec. 1980.

² Assistant Professor, Agronomy Dep., Iowa State Univ., Ames, IA 50011, and Professor, Ohio State Univ., Columbus, OH 43210.

Received for publication June 30, 1982. Accepted for publication February 16, 1983.

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