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<I personally think that flying avian forms were around since the
mid-late Triassic, based on my acceptance of Chatterjee`s Protoavis as
what he claims it is >
Actually, if you accept Chatterjee's claims about Protoavis, you'd have
to believe that flying avian forms were around much earlier than
that---since he claims that Protoavis is more a derived "bird" than
Archaeopteryx, even though it's considerably older.