The problem that most have with dinosaurs and cavemen is that we are told that they didn't coexist. Theres absolutely no proof of this. Before the flood the Bible says that things lived longer. For instance Methuselah was 969 years old. Reptiles grow continuously until they die. Try to imagine one 1000 years old. It would be pretty stinking big. Yes there were probably species that existed then that do not now. But the same could be said about alot of animals, even humans.