[1] Univ Waikato, Radiocarbon Dating Lab, Hamilton, New Zealand
[2] Victoria Univ, Sch Geog Environm & Earth Sci, Wellington, New Zealand
[3] Univ Waikato, Sch Sci Earth Sci, Hamilton, New Zealand
[4] Univ New South Wales, Sch Biol Earth & Environm Sci, Palaeontol Geobiol & Earth Arch Res Ctr, Sydney, NSW, Australia
[5] GNS Sci, Wairakei, New Zealand
[6] Natl Inst Water & Atmospher Res, Auckland, New Zealand
[7] Cornell Univ, Dept Class, Cornell Tree Ring Lab, Ithaca, NY 14853 USA
[8] Natl Inst Water & Atmospher Res, Wellington, New Zealand
[9] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA