Bradley N. Opdyke (a), Anna M. Haiblen (a) Andrew P. Roberts (a) & Paul A. Wilson (b)
(a) The Australian National University, Research School of Earth Sciences, Canberra ACT 0200, Australia. E-mail: bradley.opdyke@anu.edu.au
(b) Ocean & Earth Science, National Oceanography Centre, Southampton, European Way, Southampton SO14 3ZH, UK.