Hi Omid, Good references and review articles on this subject also include compilations of data for Precambrian sedimentary rocks: A. Prokoph, G.A. Shields, J. Veizer (2008) Compilation and time-series analysis of a marine carbonate d18O, d13C, 87Sr/86Sr and d34S database through Earth history. Earth-Science Reviews 87 (2008) 113–133 Shields, G., Veizer, J., 2002. Precambrian marine carbonate isotope database: version 1.1. Geochemistry, Geophysics, Geosystems 3 (6) June 6, 12 pp. Veizer, J., Ala, D., Azmy, K., Bruckschen, P., Buhl, D., Bruhn, F., Carden, G.A.F., Diener, A., Ebneth, S., Goddéris, Y., Jasper, T., Korte, C., Pawellek, F., Podlaha, O.G., Strauss, H., 1999. 87Sr/86Sr, 13C and 18O evolution of Phanerozoic seawater. Chemical Geology 161, 59–88. I hope this helps, Dominic ------------------------------------------------- Dominic Papineau Ph.D. Geophysical Laboratory Carnegie Institution of Washington 5251 Broad Branch rd NW Washington DC 20015 Office: 202-478-8908 Cell: 303-514-8978 ------------------------------------------------- > Dear All, > > Is there any refernce to show the values of d18O and d13C for SEA WATER > during Phanerozoic? > > > Regards > Omid Haeri-Ardakani > Earth and Environmental Science Department > University of Windsor > (519)253-3000, x2172 >