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Research was supported by grants from the National Science Foundation (EAR 73-00194, EAR 77-17064), the University of Puerto Rico (Mayaguez), the American Philosophical Society (Johnson Fund #958), and the University of the West Indies (Jamaica). The University of Puerto Rico also provided funds to facilitate collaboration between the authors during manuscript preparation. Radiocarbon dates by D.S.I.R. (New Zealand), J. J. Stipp of the University of Miami and Beta Analytic; geochemical analyses at Michigan Technological University and the Universities of Montreal, Edinburgh, and Leeds; microprobe analyses at the University of Manchester. We enjoyed cooperating in the field with the following persons:...

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