Susan Turner is a senior research associate@the Queensland Museum and Monash University, Australia. She has recently been an Australian Research Council Fellow and Australian representative on the UNESCO-IUGS Scientific Board for IGCP (now International Geoscience Programme). Her research concentrates on Paleozoic and early Mesozoic fishes, especially sharks and shark ancestors. She also studies the use of fish microfossils to date rocks and understand the Earth's past geography. Address: School of Geosciences, Monash University, Victoria 3800, Australia. Internet: s.turner@uq.edu.au