Who`s to say that the dinosaurs weren`t wiped out
Actually they didn't. Many of them evolved into birds, whilst last year they found the T-Rex shared the same DNA with chickens. Raptors were much smaller than they appear in Jurrasic Park and are closely linked to Turkeys.
Whilst many of the underwater dinos survived, including sharks, whales, alligators, crocodiles. But those how become extinct (such as trilobites) did so because they couldn't adjust to rapid changes within their environment.
Eqaully remember there is an alien of reptiles who claim to have originated from Earth, but
consider human as squatters. They could be descended from surviving dinosaurs who evolved and developed inteligence (which is why unlike humans they don't wear digital watches).