[1] Michigan State Univ, Dept Anthropol, E Lansing, MI USA
[2] Michigan State Univ, Environm Sci & Policy Program, E Lansing, MI USA
[3] Northern Illinois Univ, Dept Earth Atmosphere & Environm, De Kalb, IL USA
[4] Univ Tubingen, Dept Geosci, Biogeol, Tubingen, Germany
[5] Univ Tubingen, Senckenberg Ctr Human Evolut & Palaeoenvironment, Tubingen, Germany
[6] Univ Alaska Anchorage, Environm & Nat Resources Inst Stable Isotope Lab, Anchorage, AK USA
[7] Univ Tubingen, Inst Prehist Early Hist & Medieval Archaeol, Tubingen, Germany
[8] 655 Auditorium Rd,Baker Hall,Room 355, E Lansing, MI 48824 USA