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extinction events

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 <dino@cwis.unomaha.edu>