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largest ever asteroid impact crater found in australia

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Arcadianmemories
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« on: March 29, 2015, 10:08:11 am »

http://www.bbc.com/news/world-australia-32028173



'Largest ever asteroid impact' found in Australia


24 March 2015

Scientists in Australia have discovered what they say is the largest asteroid impact area ever found.

The 400-kilometre (250-mile) wide area is buried deep in the earth's crust and consists of two separate impact scars.

The team behind the discovery, from the Australian National University (ANU), said the asteroid broke into two before it hit, with each fragment more than 10km across.

The impact is thought to have occurred at least 300 million years ago.
 
The surface crater has long since disappeared from central Australia's Warburton Basin but geophysical modelling below the surface found evidence of two massive impacts, said Dr Andrew Glikson, who led the ANU team.

"It would have been curtains for many life species on the planet at the time," said Dr Glikson.

But the team, which published its findings in the geology journal Tectonophysics, has not been able to connect the impact to any known extinction.

"It's a mystery - we can't find an extinction event that matches these collisions," said Dr Glikson. "I have a suspicion the impact could be older than 300 million years."

The rocks around the impact zone are roughly 300 to 600 million years old, but a layer of ash that would have been thrown up by the impact has not been detected as sediment in rock layers from the same period.

The large meteorite believed to have killed the dinosaurs 66 million years ago corresponds to a layer of sediment in rocks around the world.

"Large impacts like these may have had a far more significant role in the Earth's evolution than previously thought," Dr Glikson said.

The apparent impact zone in the Warburton Basin was discovered by accident while scientists were drilling 2km under the Earth's surface for a geothermal research project.

The dig returned traces of rock that had been turned to glass by extreme temperature and pressure, consistent with a massive impact.
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« Reply #1 on: March 29, 2015, 06:01:47 pm »

so they found something...and they have already decided what it is they found and by hook or crook, they're gonna make the evidence match their conclusion, damn the facts!!

Massive asteroid=mass extinction...no extinction? well...must be older than we said at first..or something..but its STILL a impact crater! TWO as a matter of fact..

Massive asteroid=sedentary level...no sedentary level? but we're STILL right! it HAS to be an impact crater (TWO) because we said so!

but with the whole climate change fiasco, we all know that scientists would rather be right than the actual theories make sense right.
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« Reply #2 on: March 29, 2015, 08:27:59 pm »

so they found something...and they have already decided what it is they found and by hook or crook, they're gonna make the evidence match their conclusion, damn the facts!!

Massive asteroid=mass extinction...no extinction? well...must be older than we said at first..or something..but its STILL a impact crater! TWO as a matter of fact..

Massive asteroid=sedentary level...no sedentary level? but we're STILL right! it HAS to be an impact crater (TWO) because we said so!

but with the whole climate change fiasco, we all know that scientists would rather be right than the actual theories make sense right.
I think that you are wise to not take "scientific" statements at face value. certainly the entire "climate change" fiasco / hoax has reduced the credibility of scientists and their dogmatic pronouncements considerably. when I was younger, it wasn't this way. we were in awe of scientists and their abilities to make a better world for us. sad that science has been hijacked by those with a political agenda.

on the issue of mass extinctions and asteroidal or cometary impacts. there is quite a bit of evidence that 65 million years ago, a large comet impacted an area just off what is now the Yucatan peninsula, and probably threw up enough particulate matter into the atmosphere that it lead to the extinction of the Dinosaurs. certainly the fossil record shows that 99%+ of the Dinosaur species died shortly after that cometary impact (what we have left of the Dinosaurs we call the birds today). there may have been other extinctions caused by comets or asteroids also in the past and we can see the remains of some of the asteroidal impacts on the earth's surface even today - James Bay and maybe even Hudson's Bay in Canada was seemingly caused by massive asteroidal impacts.

the "crater" in Australia certainly bears examination, and if it is as big as they claim, then certainly the impact could possibly have created an Extinction Level Event during that period. I believe the period that they claim the asteroid impacted was the Permian period, which we do see evidence of mass extinctions in the fossil record of that time. Oil and gas drilling samples from the "Permian Basin" which was a shallow sea some 300 million years ago, show gaps in the species record that suggest extinctions.

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