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Re: Volcanoes (comments on pterosaur extinction)
except, the iridium layer and all other impact-related features occur
in the MIDDLE of the Deccan.....i.e. the Deccan traps were already
erupting before the bolide hit.
BTW, the Triassic-Jurassic mass extinction PREdates the central
Atlantic magmatic province (which is bigger than Deccan). So the
volcanism can NOT have caused this extinction event.
Ken Kinman wrote:
I don't know much about geology, but it seems likely to me that
the bollide collision probably set off a lot of the volcanic
activity, and that this just added insult to injury and vulcanism
was of secondary importance overall.
Emma C. Rainforth
Geosciences Rm. 206E
Lamont-Doherty Earth Observatory
ph. (845) 365-8621
fax (801) 838-4126