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O isotopes and theromreg

One major criticism of such studies is the problem of demonstrating that
the bone mineral is original and therefore that the isotopes represent
the time that the animal was alive.  One of my colleagues took a look
at Horner's study of T.rex metabolism based on the O isotopes, and concluded
that the isotopes were the product of diagenetic alteration of the bones
rather than the original isotope ratios.  The problem is hoary and 
not easy to resolve geochemically. 

Bonnie A.B. Blackwell,                          bonn@qcvaxa.acc.qc.edu
Dept of Geology,                                off: (718) 997-3332
Queens College, City University of New York,    fax: (718) 997-3299
Dept of Earth \& Environmental Sciences,        fax: (718) 997-3349
The Graduate Center, CUNY,                      fax: (718) 997-3513
Flushing, NY 11367-1597                         messages: (718) 997-3300