![]() ![]() The cause of the Permian-Triassic extinction event is not fully understood. It forms the transition between the late Palaeozoic Era, which was mainly populated by synapsids, or mammal-like reptiles, and the Mesozoic Era, when the archosaurian reptiles, which includes the dinosaurs, came to dominate.' Permian-Triassic extinction: the Great Dying He says, 'The Triassic is an interesting period. It represents the divide between the Palaeozoic and the Mesozoic Eras.ĭr Mike Day is the curator of fossil reptiles at the Museum. The Permian-Triassic extinction event, also known as the Great Dying, took place roughly 252 million years ago and was one of the most significant events in the history of our planet. The Triassic Period (252-201 million years ago) began after Earth's worst-ever extinction event devastated life.
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