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During the age of Dinosaurs a number of extinction events occurred.
I am looking for information or the timing for such events and how
they may have effected the development of certain groups of Dinosaurs.
Example: A sauropod extinction in North America during the early Cretaceous
and reintroduction of titanosaur sauropods in the late Cretaceous.
Robert Bakker hinted on a possible event at the end of the late
Gregory Paul in his book "Preditory Dinosaurs of the World" has a
graph showing bolide impacts throughout the Mesozoic. Is there good
documentation for these events?
---John Schneiderman <email@example.com>