Just thought you may be interested in this ref. on the Red Sea: Stoffers, P. & Botz, R. (1990). Carbonate crusts in the Red Sea: Their composition and Isotope Geochemistry. In Ittekkot, V., Kempe, S., Michaelis, W. & Spitzy, A. (eds.): Facets of Modern Biogeochemistry, Festschrift for E.T. Degens, pp. 242-252. Springer-Verlag, Berlin. Cheers Darren --------------------------------------------- Darren R. Grocke Department of Earth Sciences University of Oxford Parks Road Oxford OX1 3PR UNITED KINGDOM Phone: +44 1865 272 019 Fax: +44 1865 272 072 E-mail: [log in to unmask] http://www.earth.ox.ac.uk/~darreng/ ---------------------------------------------