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aug 6, 440056427 BC - first mass extinction event

Description:

the end ordovician period occurred 440 million years ago and 86% of all species were lost https://userpages.umbc.edu/~squire/extinctions.html

Added to timeline:

alex huang science timeline

26 Oct 2018

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Date:

aug 6, 440056427 BC

Now

~ 5883516 years ago

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