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Richard, You might want to look into a recent compilation of references/standards isotopic values and general isotopic isotopic ranges of specific terrestrial materials: Coplen et al. (2002): Compilation of minimum and maximum isotope ratios of selected elements in naturally occuring terrestrial materials and reagents. Water-Resources Investigations Report 01-4222 by US Dept. of the Interior/US Geol. Surv.: 98 pp. Of course, you can have a look into the somewhat older handbook by Jochen Hoefs (1997)Stable isotope geochemistry. Springer: 201 pp (4th edition), giving a good overview of isotopic ranges of different materials on Earth too. I hope this is helpful to you, Pier. ************************************************************************Dr. Pier A. de Groot European Commission Joint Research Centre Institute for Reference Materials and Measurements (IRMM) Retieseweg 2440 Geel Belgium Tel. +32 (0)14 571 628 Fax +32 (0)14 571 863 e-mail: [log in to unmask] Visit my WEB-site about my “Handbook of Stable Isotope Analytical Techniques” at: http://users.pandora.be/handbook/index.html last update: 9 June, 2002. ************************************************************************ ************************************************************************Dr. Pier A. de Groot European Commission Joint Research Centre Institute for Reference Materials and Measurements (IRMM) Retieseweg 2440 Geel Belgium Tel. +32 (0)14 571 628 Fax +32 (0)14 571 863 e-mail: [log in to unmask] Visit my WEB-site about my “Handbook of Stable Isotope Analytical Techniques” at: http://users.pandora.be/handbook/index.html last update: 9 June, 2002. ************************************************************************