By the same reasoning, Protoavis has features that
are present only in birds (and there is a fair amount of it)
At least from the one paper by Chatterjee I have read on it, this is not
quite true. What was repeatedly said was that some feature was found only
in birds *and* *crocodilians*. From this I concluded it was more likely to
be a pre-crocodilian than an early avian.
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May the peace of God be with you. sarima@ix.netcom.com