Expert Says It Was
Hotter 247 Million Years Ago
April 05, 2006 — By Associated Press
CAVE JUNCTION, Ore. — John Roth
shined his flashlight on a black streak flowing through the
cream-colored marble forming the walls of the Oregon Caves.
The graphite line is graphic evidence of dramatic global warming that
consumed so much oxygen that it nearly wiped out all life on the planet
247 million years ago, said the natural resources specialist for the
Oregon Caves National Monument.
"It was the biggest extinction by far of all time," he said. "Geologists
and paleontologists all agree on that. ... The extinction that killed
the dinosaurs about 65 million years ago, that wasn't anything compared
to this."
Yet, like the huge meteor striking the Gulf of Mexico that many
scientists believe wiped out the dinosaurs, the global warming at the
end of the Permian period resulted in deadly amounts of carbon dioxide
that killed most land animals, he said.
Scientists aren't certain what caused the episode some 247 million years
ago. They estimate that temperatures ranged in the low 100s year-round
for thousands of years, he said.
"Its kind of scary that we don't know for sure what caused the worst
catastrophe of life on this planet," he said.
The graphite lines, whose significance was recently recognized, are not
unique to the caves, which were formed perhaps half a million years ago,
he said.
Roth is a geologist by training and a former science teacher who has
worked as a natural resource specialist at the monument for 17 years.
He said the new evidence suggests that "we had a runaway hothouse effect
because of the excess carbon dioxide. There was so much carbon dioxide
introduced into the atmosphere, mostly from methane from the oceans."
That carbon dioxide build-up alone would have killed off most
oxygen-breathing species, he said.
With the annual caves tour season under way, this latest discovery will
give guides yet another scientific topic to discuss with visitors.
Another is the fact a jaguar fossil found in the caves in 1995 was
recently dated by a Canadian expert to be 32,800 years old, making it
one of the oldest known jaguar fossils found in North America, Roth
said.
Grizzly fossils thousands of years old were found in 1997 by a team
mapping the far interior of the caves. Half a dozen previously
undescribed species of insects, including a relic from the last Ice Age,
also have been found there.
Source: Associated Press
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