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The Effect of Drainage on the Weathering of the Clay Minerals in the Allenwood Catena of Pennsylvania¹

ABSTRACT

The clay minerals from each horizon of a poorly-drained and well-drained member of the Allenwood catena were examined by X-ray methods. In both drainage members the weathering sequence found was: mica (illite) mica intermediate vermiculite chlorite-like. Apparently, drainage conditions controlled the degree of expression of this weathering sequence in the two soils investigated.

¹ Authorized for publication November 29, 1956 as Paper No. 2107 in the Journal Series of the Pennsylvania Agricultural Experiment Station. Presented before Div. V, Soil Science Society of America, Nov. 14, 1956, at Cincinnati, Ohio.

² National Science Foundation Fellow and Professor of Soil Technology, respectively, Agronomy Department, The Pennsylvania State University, University Park, Pennsylvania.

Received for publication November 7, 1956. Accepted for publication April 26, 1957.