The Triassic period was significantly shaped by the events of the Permian period, particularly the Permian-Triassic extinction event, which occurred around 252 million years ago. This catastrophic event led to the loss of approximately 90-96% of marine species and around 70% of terrestrial vertebrates, drastically altering ecosystems. The aftermath of this mass extinction created ecological opportunities for the rise of new groups of organisms, including early dinosaurs and mammals, during the Triassic. Additionally, the climate and geological changes initiated in the Permian continued to influence conditions in the Triassic, fostering a period of recovery and diversification.
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