By the late early Triassic some of the small diapsids has evolved to 5m long with massive heads
The Triassic Period (252-201 million years ago) began after the worst extinction event in Earth's history devastated life. The Permian-Triassic extinction event, also known as the Great Dying, occurred approximately 252 million years ago and was one of the most significant events in our planet's history.
Lizards, turtles, rhynchocephalians (lizard like animals), and crocodilians are modern groups whose ancestral forms first appeared in the Middle and Late Triassic. Therapsids, or mammal-like reptiles, experienced extinction pulses in the Late Permian.
It saw the appearance of both the dinosaurs and of mammals.
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