1. Archaeometry Laboratory, University of Missouri Research Reactor, Columbia, MO 65211, USA.
2. Applied Paleoscience, Bothell, WA 98011, USA.
3. DirectAMS, Bothell, WA 98011, USA.
4. School of Geography and Earth Sciences, McMaster University, Hamilton, ON L8S 4K1, Canada.
5. Centro Investigador del Sistema Acuífero de Q Roo (CINDAQ A.C.), Puerto Aventuras, Q Roo, Mexico.
6. Qualcomm Institute, University of California, San Diego, La Jolla, CA, 92093-0436, USA.
7. Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824, USA.
8. Electron Microscopy Core, University of Missouri, Columbia, MO 65211, USA.
9. Department of Anthropology, University of Arkansas, Fayetteville, AR 72704, USA.
10. Instituto Nacional de Antropología e Historia, Mexico City, DF, Mexico.