Jurassic Earth was a golden time for dinosaurs, with formidable carnivores and powerful herbivores roaming the Earth. In fact, these beasts survived for at least 230 million yrs prior to starting to be extinct close to sixty six million several years back at the end of the Cretaceous time period. https://dinosaurworldlive.com/blog/typical-day-in-the-life-of-a-dinosaur