[Taxacom] Permo-Triassic extinction
kinman at hotmail.com
Sun Jun 4 23:17:00 CDT 2006
I have seen some news reports in the past several days about a possible
crater in Antarctica being related to the massive extinction at the
Permian-Triassic boundary. First of all, there seems to be no evidence that
this anomaly is even contemporaneous with that event. Furthermore, we
already have the Bedout Crater off the northwestern coast of Australia that
is already known to be statistically the same age as the Permian-Triassic
extinction. So why try to link the Antarctic crater with this extinction
when we don't know its age? Needless speculation, hyped up even more by the
press. And EVEN IF this "crater" is the right age, the two craters would no
doubt be connected (breakup of a comet/asteroid before hitting the Earth,
much like the multiple strikes on Jupiter some years back).
But what bothers me even more is the downplaying of impacts as the
cause of both the Permian-Triassic and the Cretaceous-Tertiary extinctions
just because of vulcanism known to have occurred around the same times.
Seems to me that such volcanic activity could easily be triggered by such
huge jolts to the Earth, and that impacts caused both vulcanism and
extinction. If a bullet to the brain happens to cause a nose bleed, it
would be silly to list the nose bleed as the cause of death. The bullet
simply caused both the nose bleed and death more or less at the same time.
Not that vulcanism cannot cause extinctions, but when you have evidence of a
massive impact, why blame a massive extinction on volcanic activity?
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