Actually, T-Rexes and velociraptors were from the Cretaceous. “Jurassic Park” just had a more marketable ring to it, I guess.
It was easier to spell! LOL
Yes, and T-Rexes were only around at the very end of the 80 million year-long Cretaceous Period, perhaps just the final 2 million years of it, right up until the time the asteroid or whatever it was wiped the dinosaurs out. The Cretaceous Period was the interval between 145.5 to 65.5 million years ago.