assisted in the coring operations. J. F. Tailing and Ida B. Tailing contributed unpublished chemical data from Pilkington Bay. J. C. D. Watts sent echograms of the bay. At Duke, S. Duncan Heron provided X-ray diffraction equipment, and Marion R. Bryson helped with the statistical analyses. Mark A. Mantuani taught me sediment chemistry, and Peter Kilham did the same for phytoplankton biology. D. A. Living. stone and J. L. Richardson have been unfailing sources of instruction and perceptive commentary. Sally M. Kendall, my wife, prepared the data tables with amazingly good humor. Sandra F. Zane drew most of the figures, and Joan Howard created the final typescript.

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