croc distribution

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A couple of years ago someone forwarded me a map of NA showing the
distribution of crocodilian specimens throught the Cenozoic and late
Mesozoic.  The point was to use them as paleotherms.  I can not recall who
it was so I do not know where to start looking in my files.  Anyone out
there got a clue?  Also any other information on this topic (i.e.
crocodilian distribution through time and possible climatic implications)
would be greatly appreciated.

Dr. Mark A. Norell
Department of Vertebrate Paleontology
American Museum of Natural History
Central Park West at 79th Street                        212-769-5804 voice
New York, New York 10024-5192                           212-769-5842 FAX