Acknowledgements
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 per-
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