We would like to thank the following friends and colleagues who have helped us with various aspects of the preparation of this book: Tim Atkinson, Rachel Cave, Tony Greenaway, Robin Haynes, Kevin Hiscock, Alan Kendall, Gill Malin, John McArthur, Rachel Mills, Willard Pinnock, Annika Swindell and Elvin Thurston. Special thanks are due to Nicola McArdle for permission to use some of her sulphur isotope data.

We have used data or modified tables and figures from various sources, which are quoted in the captions. We thank the various authors and publishers for permission to use this material, which has come from the following sources.

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