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Re: Report Sez Volcanic Gases Killed The Dinosaurs
If the Deccan traps date to the K-Pg boundary, then presumably the
dinosaurs in the intertrappean beds must be Paleocene? And if so it
does seem rather odd that the eruptions should have wiped out the
dinosaurs everywhere except in India.
actually seems to indicate that most of the activity occurred
*before* the K/Pg boundary.
At 22:15 2007-11-02, Richard W. Travsky wrote:
Gas may be to blame for extinction
Contrarian theory argues against meteorite killing dinosaurs.
A worldwide burp of volcanic gases caused the mass extinction that
wiped out dinosaurs and other creatures 65 million years ago, says
research reported this week. Its the latest argument from a group
that has been trying for some time to discredit the leading
theory that a meteorite striking Mexico led to the mass die-offs.
The international team says that we should instead blame plumes of
climate-altering gas given off by monumental lava flows that stretch
hundreds of kilometres across India.
The Deccan Traps, as theyre called, have been suspected before of
having some sort of global impact around the end of the Cretaceous
period and the beginning of the Tertiary, known as the KT boundary.
Earlier research had dated the main outburst of the lava flows as
occurring within 800,000 years of the boundary. But the new analysis
uses tiny plankton fossils, trapped between lava layers, to date the
flow to the boundary itself.
This is the first time we can link the main phase of the Deccan
Traps to the mass extinction, says team leader Gerta Keller, a
palaeontologist at Princeton University in New Jersey. Keller and
Thierry Adatte of the University of Neuchtel in Switzerland
presented their research on 30 October in Denver, Colorado, at the
annual meeting of the Geological Society of America.