06-July-2009, 05:36 PM
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Established Member
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Join Date: Oct 2007
Posts: 1,009
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The best bets for the mass extinction at the Cretaceous-Tertiary boundary are either an impact with a large object such as an asteroid, or a period of massive vulcanism, or perhaps both. However, some have proposed a GRB as a contributor to the mass extinction even at the end of the Ordovician period.
Nick
Last edited by Nick Theodorakis; 06-July-2009 at 05:37 PM..
Reason: spelling
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