*Shaun P Williams¹、Emily M Lane¹、Catherine Chagué-Goff²、James Williams³、James Goff² (1.National Institute of Water and Atmospheric Research, 10 Kyle Street, Christchurch 8011, New Zealand、2.PANGEA Research Centre, School of Biological, Earth and Environmental Sciences, UNSW Australia, Sydney 2052 NSW, Australia、3.Department of Geological Sciences, University of Canterbury, PB 4800, Christchurch 8140, New Zealand)