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18O ) relative to V-PDB (Vienna-Pee Dee belemnite) and analytical precision was ±0.06‰.
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We thank two anonymous reviewers and R. Gill for thoughtful review and discussion, T. Janecek and Y. Guyodo for analytical assistance, and S. Harris, C. Page, J. Abreu Sierra, E. May Bote, and R. Medina Gonzalez for logistical field support. Radiocarbon analyses were made at the Center for AMS under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory Contract W-7405-Eng-48. Supported by the U.S. National Science Foundation (EAR-9709314), National Geographic Society, University of Florida Opportunity Fund, and the British Broadcasting Corporation. Publication L-0001 of the Land Use and Environmental Change Institute.
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