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Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
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Author | Topic: Meteor evidence linked to another Mass Extinction Event | |||||||||||||||||||||||||||
RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
From Big bang in Antarctica -- killer crater found under ice(one of many possible sources):
The 300-mile-wide crater lies hidden more than a mile beneath the East Antarctic Ice Sheet. And the gravity measurements that reveal its existence suggest that it could date back about 250 million years -- the time of the Permian-Triassic extinction, when almost all animal life on Earth died out. Its size and location -- in the Wilkes Land region of East Antarctica, south of Australia -- also suggest that it could have begun the breakup of the Gondwana supercontinent by creating the tectonic rift that pushed Australia northward. Scientists believe that the Permian-Triassic extinction paved the way for the dinosaurs to rise to prominence. The Wilkes Land crater is more than twice the size of the Chicxulub crater in the Yucatan peninsula, which marks the impact that may have ultimately killed the dinosaurs 65 million years ago. The Chicxulub meteor is thought to have been 6 miles wide, while the Wilkes Land meteor could have been up to 30 miles wide -- four or five times wider. Life survives even massive extinction events, new life arises to take the place of the species that died, filling the niches with new forms, and the rate of change in species is raised by the loss of competition until a new balance is achieved. Enjoy. Note to self: work on an exit strategy .... we are limited in our ability to understand by our ability to understand RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Biological Evolution forum
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AdminNWR Inactive Member |
Thread moved here from the Proposed New Topics forum.
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Coragyps Member (Idle past 735 days) Posts: 5553 From: Snyder, Texas, USA Joined: |
Interesting. One can speculate about whether this has anything to do with the Siberian basalts of the same age - immense volcanic outpourings that have also been suggested as a cause for the end-Permian extinctions. Could that part of Siberia been directly opposite this meteor strike? That relationship has been mentioned for Chixulub and the Deccan Traps, another basalt outpouring.
Hmm. Paleogeography, I wish I knew ya.
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Chiroptera Inactive Member |
Interesting if this holds up under further investigation.
As many here already know, the Permian-Triassic event was the greatest known mass extinction event; about 95% of known marine species and 70% of known land species became extinct.
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anglagard Member (Idle past 837 days) Posts: 2339 From: Socorro, New Mexico USA Joined: |
I have often wondered about the relationship between impacts and massive volcanism since Alvarez first hypothethized the K-T impact was what created Iceland back in the mid 70s before Chixulub was discovered. Such coincidences are impressive. Any Geophysicists around to help explain the connection {provided it exists}?
Edited by anglagard, : EvC inspired caution in making sweeping statements
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ohnhai Member (Idle past 5163 days) Posts: 649 From: Melbourne, Australia Joined: |
RAZD writes: Note to self: work on an exit strategy .... Indeed. We need to get off this rock in a big way. Too much like eggs in one basket at the moment. Indipendant Martian and Lunar collonies should help. Needs to be a global effort, and need to start NOW!
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Coragyps Member (Idle past 735 days) Posts: 5553 From: Snyder, Texas, USA Joined: |
Could that part of Siberia been directly opposite this meteor strike? Apparently so, he answered himself. According to my one paleo book, Angaraland (Hi, Queenie!), Siberia-to-become, was approximately opposite to the Antarctica-to-be piece of Godwana back then. Do we have a pattern? Is it something to do with shock waves focussing at the antipodes to a giant impact like those? Edited by Coragyps, : fix typo
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
And people have been looking for a P-T meteor site ever since K-T was shown to be pretty solid.
I wouldn't be surprised that basalt outcroppings were related to volcanism that occurred at weak points or fissures as the pressure wave of the impact travelled through the surface. Things like this would tend to reset the "clock" of evolution. we are limited in our ability to understand by our ability to understand RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Makes one think of the earth ringing like a bell eh?
we are limited in our ability to understand by our ability to understand RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ... to share.
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Damouse Member (Idle past 4906 days) Posts: 215 From: Brookfield, Wisconsin Joined: |
Indeed. We need to get off this rock in a big way. Too much like eggs in one basket at the moment. Indipendant Martian and Lunar collonies should help. Needs to be a global effort, and need to start NOW!
I dont remember the details, but Bush said something about putting a permanent colony on the moon by 2015 in his NASA Agenda.The trouble with space travel is the fraility of humans to radiation, we currently have no viable protection. On the other hand, why not a counter-measure system? Do we have the resources to stop a 30 mile long rock moving at a few thousand kilometers per second? And on the other other hand, lets deal with global warming, energy supply, and nuclear threats first. -I believe in God, I just call it Nature -One man with an imaginary friend is insane. a Million men with an imaginary friend is a religion. -People must often be reminded that the bible did not arrive as a fax from heaven; it was written by men.
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Chiroptera Inactive Member |
quote: Oh, I don't know. Seeing that humans are the principle cause of the current on-going mass extinction event, I wouldn't feel it a terrible loss if Homo sapiens ended up being one more statistic in the three and a half billion year history of life. "We must respect the other fellow's religion, but only in the same sense and to the extent that we respect his theory that his wife is beautiful and his children smart." -- H. L. Mencken (quoted on Panda's Thumb)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
the only encouraging aspect is that the overall trend seems to be:
largest objects getting smaller ... of course this is based on quick a sample of 3 ... though there may be others (1) impact formation of the moon(2) PT boundary (3) KT boundary we are limited in our ability to understand by our ability to understand RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ... to share.
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lfen Member (Idle past 4678 days) Posts: 2189 From: Oregon Joined: |
Seeing that humans are the principle cause of the current on-going mass extinction event, I wouldn't feel it a terrible loss if Homo sapiens ended up being one more statistic in the three and a half billion year history of life. I'm attached to the current ecology because that is what I know. On the other hand haven't the mass extinctions opened up niches with the result of new species having opportunities, like dinosaurs being replaced by mammals? I personally don't like all this extinction but change seems to be the theme of the universe and perhaps we are the agents that will clear room for the next new whatevers to develop? This is more a musing than a theory. lfen
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Chiroptera Inactive Member |
quote: Bah. A mere correction to an earlier mistake. If I recall correctly, the synapsids (mammal ancestors) were the dominant land animal until the Permian/Triassic extinction event wiped out most of them, allowing the archosaur ancestors the upper hand. -
quote: Yes, and I do admit to having a personal attachment to humans. On the other hand, having long ago accepted my own eventual demise, I have difficulty being too overwrought about the eventual end of the entire species. "We must respect the other fellow's religion, but only in the same sense and to the extent that we respect his theory that his wife is beautiful and his children smart." -- H. L. Mencken (quoted on Panda's Thumb)
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