Talk:Cambrian–Ordovician extinction event

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) The Cambrian Ordovician (487Ma-ago) cooling predates Maastrichtian cooling 70Ma-ago by 417Ma. Perhaps Miller could compare these two cooling stages. Early Maastrichtian 'δ18O results suggest accelerated cooling, resulting in the lowest marine temperatures of the Late Cretaceous.'. Ordovician-Cambrian Miller coolng hypothesis. That these are 417Ma, as well as three other period pairs are 417Ma separated are found in user User:Morbas:Geologic Physical Driver.Morbas (talk) 19:50, 27 February 2014 (UTC)

Alternative theory
this video suggests this Cambrian extinction is probably not well understood. There is no sharp break as experts originally though. Just leaving a suggestion to dig further in the scientific literature.--Alexmar983 (talk) 02:02, 20 August 2018 (UTC)

Wiki Education assignment: Current Topics in Earth and Environmental Sciences
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