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Murata, K.J., Friedman, I., and Madsen, B.M. (1967) Carbon-13-rich
diagenetic carbonates in Miocene formations of California and Oregon.
Science, v. 156, p.1484-1486.
If I remember correctly, some of the dolomites desribed in the above paper
have d13C values higher than +30 (for the reason Max mentioned: exchange
reactions between HCO3- and a large reservoir of organic matter).
James R. O'Neil
Department of Geological Sciences
University of Michigan
Ann Arbor, MI 48109-1063
Fax: (313) 763-4690
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