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Cambrian–ordovician extinction event

mass extinction event; occurred approximately 488 million years ago

Pronunciation
/ˈkambrɪən – ˌɔːdəˈvɪʃɪən ɛkˈstɪŋkʃən ɪˈvɛnt/
/ˈkæmbriən – ˌɔrdəˈvɪʃən ɪkˈstɪŋkʃən əˈvɛnt/
Categories
extinction event