Triassic

The Permian–Triassic extinction event occurred about 250M years ago.

Researchers said the dinosaur - named Ingentia prima, meaning "the first giant" - was up to 10 meters long and weighed about 10 tons, living about 210 million years ago during the Triassic Period.

Dinosaurs first appeared earlier in the Triassic Period, roughly 230 million years ago.

The ancestors of the Theropoda appear first in the Triassic period, already of large size, but less completely bipedal than their successors.

“Well,” Ellie said. “We know animals have survived. Crocodiles are basically Triassic animals living in the present. Sharks are Triassic. So we know it has happened before.”

Fossils are particularly well described from the Carboniferous, Triassic, Jurassic and Cretaceous periods and have been found in the USA, England, Russia, Lebanon and Germany. Sites such as Lyme Regis in Dorset have particularly yielded number of Jurassic “squid” ink sacs and nodules (Doguzhaeva et al. 2004).