[1] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
[2] Australian Natl Univ, Res Sch Pacific & Asian Studies, Canberra, ACT 0200, Australia
[3] Univ Oxford, Res Lab Archaeol & Hist Art, Oxford OX1 3QJ, England
[4] Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia
[5] Univ Innsbruck, Inst Geol & Palaontol, A-6020 Innsbruck, Austria