A newly identified mass extinction event took place 233 million years ago and was likely caused by massive volcanic eruptions in what is now western Canada.
원문출처 : https://www.cnn.com/2020/09/16/world/new-mass-extinction-scn-trnd/index.html
원문출처 : https://www.cnn.com/2020/09/16/world/new-mass-extinction-scn-trnd/index.html