Ya know, I disagree with the theory that the dinosaurs were wiped out in one cataclysm.
What would seem more likely, according to the evidence we keep finding, is that it happened in chunks and pieces over time.
That may be why there are drawings found of giant reptiles and mammals in action. Real-life experience or tribal legend.
Maybe man walked with the dinosaurs. But there were darn few of them and only in certain climates.