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RE: Stratigraphy, biogeography & cladograms

Betty wrote:

<It seems to me that (modern birds) may simply be all that's left of a
major group of animals (major prebird creature group) that extended
from the early Jurassic right on into the late Cretaceous.>

J. Jackson wrote...
< That's what Sankar Chatterjee proposed, I believe.

     That's what John Ostrom, Kevin Padian, Alan Fedduccia, Larry Martin, and 
Alick Walker suggested too. 

LN  Jeff