Dinosaur extinction - meteor not to blame?

The Fun Guy writes: "Recent microfossil evidence casts fresh doubt as to whether an asteroid wiped out the dinosaurs. Prof. Gerta Keller of Princeton University: "We now have evidence that the Chicxulub impact occurred about 300,000 years before the end of the Cretaceous and thus didn't cause the mass extinction and, in fact, didn't cause any species to go extinct." These findings were presented during the October 2006 meeting of the Geological Society of America."