1. Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA
2. Department of Anthropology, Southern Illinois University Carbondale, Carbondale, IL 62901, USA
3. Center for Archaeological Investigations, Southern Illinois University Carbondale, Carbondale, IL 62901, USA
4. Illinois State Archaeological Survey, University of Illinois at Urbana-Champaign, Nuclear Physical Laboratory, Champaign, IL 61820, USA
5. Accelerator Mass Spectrometry Laboratory, Department of Physics, University of Arizona, Tucson, AZ 85721, USA