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This article in SSSAJ

  1. Vol. 21 No. 5, p. 539-542
    Received: Nov 7, 1956
    Accepted: Apr 26, 1957

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

  1. L. J. Johnson and
  2. C. D. Jeffries2



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.

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