Acknowledgements

Information and advice from many senior managers, scientists and engineers in PSTl's Member companies are gratefully acknowledged. However, the responsibility for the content of the document, its emphasis and conclusions, lies solely with PSTI.

For further information on the matters addressed in this document contact Dr Stewart Brown, Director of Geoscience, PSTI, Research Park, Riccarton, Edinburgh, EH14 4AP. Tel: +44 (0)131451 5231.Fax: +44 (0)131451 5232.

Last Updated 9/9/96