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Eocene–oligocene extinction event

mass extinction

Pronunciation
/ˈiəˌsin – ˈɑləɡoʊˌsin ɪkˈstɪŋkʃən əˈvɛnt/
/ˈiːəʊsiːn – ˈɒlɪɡəʊsiːn ɛkˈstɪŋkʃən ɪˈvɛnt/
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