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Permian-triassic extinction event

mass extinction event at the end of the Permian Period approximately 250 million years ago

Pronunciation
/ˈpəːmɪən - trʌɪˈasɪk ɛkˈstɪŋkʃən ɪˈvɛnt/
/ˈpərmiən - traɪˈæsɪk ɪkˈstɪŋkʃən əˈvɛnt/