Talk:Cambrian–Ordovician extinction events
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[edit] First?
I think the Oxygen Catastrophe must have been the first extinction event--Robert van der Hoff 09:25, 9 May 2007 (UTC)
Of course it was before the Cambrina-Ordovician period--Robert van der Hoff 09:27, 9 May 2007 (UTC)
Plus there is the end Ediacaran extinction, and possibly another one at 650Ma which affected about 3/4 of marine life, mainly stromatolites and acritarchs
Maybe the oxygen catastrophe wasn’t the earliest extinction ive even heard some scientists say (such as here) that life formed more than once on earth and went completely extinct several times before life became firmly established on earth.--Fang 23 (talk) 19:54, 13 December 2007 (UTC)
