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Scientists say comet killed off mammoths, saber-toothed tigers
www.physorg.com ^ | 02 JAN 2009 | By Robert Mitchum

Posted on 01/02/2009 7:44:26 AM PST by Red Badger

First an explosion as powerful as thousands of megatons of TNT rained meteorites down on North America. Then forest fires broke out across the continent, sending up a thick layer of soot and dust that blocked out the sun. A sudden ice age ensued, and some of the Earth's largest animals went extinct in a blink of geological time.

It's well known that a meteorite colliding with Earth is considered the most likely reason dinosaurs died off 65 million years ago. Now a team of scientists says it has found new evidence that a comet triggered a similar extinction much more recently: just 13,000 years ago, when humans were around to witness the event and suffer its terrible consequences.

The researchers also think that when the comet exploded above the planet's surface - ultimately killing off mammoths, saber-toothed tigers and other large mammals that roamed North America - Chicago wasn't too far from ground zero.

"If you'd been in Chicago back in that time, it would've been one very bad day," said Allen West, an Arizona geophysicist and one of the authors of a paper appearing Friday in the journal Science.

The scientists, led by University of Oregon anthropologist Douglas Kennett, say their report offers up a "smoking bullet" - proof it was a comet that set off the sudden, thousand-year freeze and wiped out the big animals of the era.

Working at multiple sites across the continent, researchers found nanodiamonds - microscopic particles thought to be found on comets - in a 13,000-year-old layer of rich sedimentary soil called a "black mat." Beneath the layer with the nanodiamonds, fossils of the animals are abundant. After that layer, they disappear, West said.

"It's extraordinary that tens of millions of animals disappeared synchronously at exactly the time when the diamonds and carbon layer are laid down across the continent," said West, whose co-authors include DePaul University chemist Wendy Wolbach.

Arrowheads and other artifacts from the Clovis culture of humans - an early hunter-gatherer society - also vanish after the black mat was laid down 13,000 years ago.

In 2007, West and a team of scientists published an analysis of black mats from several regions that found heavy metals, soot and charcoal suggestive of meteorite impacts and subsequent fires. The new report says the discovery of nanodiamonds in the same material is more evidence of a cosmic strike.

Archeologists have long speculated about whether climate change or over-hunting drove the mammoths, tigers and other "megafauna" to extinction and led to the decline of the Clovis culture.

Many remain skeptical of the comet theory and think there may be better explanations for what happened, said Daniel Amick, an associate professor of anthropology at Loyola University who studies the Clovis culture.

"When most archeologists heard about it they were somewhat dismissive," Amick said. "We would think, 'How in the world could we have missed this? How could this spectacular kind of event have occurred and never even dawned on us?'"

The authors have much to prove before their theory is accepted, Amick said, like pinpointing the date of the event and ruling out other potential causes of extinction and climate change.

In response to one common criticism of the comet theory - that no craters have been found from an impact - West said the comet may not have actually reached Earth, but exploded into fragments somewhere above the surface.

Where exactly that might have happened is a mystery, but high concentrations of nanodiamonds at a site in Eastern Michigan suggest the Great Lakes as a possibility.

"We think that Chicago might well have been very near ground zero," West said.

The idea that a comet may have caused catastrophic climate change and extinction relatively recently in Earth's long history suggests scientists shouldn't dismiss the possibility of it happening again, Wolbach said.

"Should we be doing more to try to deflect future asteroids, or is that too sci-fi?" she said. "If this is true and there was an impact 12.9 thousand years ago, obviously this is not something that's just a theoretical idea, it's a real thing."

___


TOPICS: Canada; Culture/Society; Miscellaneous; News/Current Events
KEYWORDS: catastrophism; climatechange; crevo; dinosaurs; globullwarming; godsgravesglyphs; piltdownman; space
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Well, at least we know now that it wasn't Fred Flintstone and his new invention, fire................
1 posted on 01/02/2009 7:44:26 AM PST by Red Badger
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To: Red Badger

Wow this is out of a primo science fiction movie and guaranteed to garner gobs of good grant money


2 posted on 01/02/2009 7:47:32 AM PST by dennisw (On the 31st floor a gold plated door won't keep out the Lord's burning rage ---FBB)
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To: Red Badger

I was never fond of the theory that man hunted the mammoth to extinction.


3 posted on 01/02/2009 7:48:19 AM PST by YdontUleaveLibs (Reason is out to lunch. How may I help you?)
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To: Red Badger
...Arrowheads and other artifacts from the Clovis culture of humans

That would be the Ledbetters of Route Four, Liberty, Mississippi.

4 posted on 01/02/2009 7:50:01 AM PST by NCjim ("Lies have to be covered up, truth can run around naked." - Johnny Cash)
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To: YdontUleaveLibs

This stuff is such hogwash, honestly, science is nothing but fairy tales these days, in search of either grants to futher their worthless careers or to carry the mantle of thier twisted ideology.


5 posted on 01/02/2009 7:50:19 AM PST by Scythian
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To: Scythian

I take it you aren’t a big fan of science?


6 posted on 01/02/2009 7:52:56 AM PST by DevNet
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To: Red Badger

The world continues to find every reason under the sun EXCEPT for the Flood in Noah’s days to explain why the animals all died off.


7 posted on 01/02/2009 7:54:32 AM PST by pctech
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To: Red Badger
NYT headline:

Comet hits planet: mammoths and saber-tooth tigers hit hardest

8 posted on 01/02/2009 7:55:54 AM PST by ClearCase_guy
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To: Red Badger
"Should we be doing more to try to deflect future asteroids, or is that too sci-fi?" she said.

Well, comets are different - they don't necessarily have one solid center mass and can't easily be pushed aside.

9 posted on 01/02/2009 7:56:35 AM PST by Mr. Jeeves ("One man's 'magic' is another man's engineering. 'Supernatural' is a null word." -- Robert Heinlein)
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To: Red Badger

The next Comet will impact above Wrigley field just as the Little Bears are about to clinch the NL pennant.


10 posted on 01/02/2009 7:56:49 AM PST by Apercu ("A man's character is his fate" - Heraclitus)
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To: Red Badger
When Santa's running late, those reindeer don't let anything get in the way....
11 posted on 01/02/2009 7:57:00 AM PST by mikrofon (Happy New Year 2009!)
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I blame Bush.


12 posted on 01/02/2009 7:57:31 AM PST by evets (beer)
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To: Red Badger
Scientists say comet killed off mammoths, saber-toothed tigers

LOL! They missed one-our big old orange tabby,Rusty,who has earned the nickname "Smilodon". We jokingly refer to his parentage as a cross between a pitbull and a saber-toothed tiger (but he really is a sweetheart..just don't aggravate him!)
13 posted on 01/02/2009 7:59:04 AM PST by gimme1ibertee (Sarahlution!!!!!)
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To: Red Badger

Scientists proving once more, they don’t know sh*t.


14 posted on 01/02/2009 7:59:05 AM PST by ryan71
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To: Red Badger
Comet?


15 posted on 01/02/2009 7:59:51 AM PST by PBRSTREETGANG
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To: Red Badger
It's not just for cleaning.
16 posted on 01/02/2009 8:00:06 AM PST by Vigilanteman (Are there any men left in Washington? Or, are there only cowards? Ahmad Shah Massoud)
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To: DevNet
I take it you aren’t a big fan of science? No, that's not it at all and typical reaction when someone points out the flaws. What I'm sick of is announcements that water was found on Mars 2.8 seconds after our robot lands there (no proof), that this building block for life was found here on this planet 9 billion light years away (lol) and so on and so on ..., that animals are gay too, and on and on with the retarded crap, honestly, I read the headlines today and laugh and am amazed that they report this stuff on the news and the massive just "believe it". There is real science, done by people who still use critical thinking, but they are generally frowned upon because their conclusions don't prop up the ideology of the mainstream scientists. And I'm not talking about Christian Scientists, I'm talking about scientist still generally interested in the truth.
17 posted on 01/02/2009 8:00:14 AM PST by Scythian
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To: Red Badger
I didn't know it was available back then. Well, at least they would have been clean!


18 posted on 01/02/2009 8:00:21 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: PBRSTREETGANG

SNorting it will kill you...........


19 posted on 01/02/2009 8:00:37 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: Vigilanteman; PBRSTREETGANG

aw dang, that’s what I get for not scrolling the whole thread!


20 posted on 01/02/2009 8:01:17 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: PBRSTREETGANG; Vigilanteman; F15Eagle

SNorting it will kill you...........damn! 3 posts in a row!......


21 posted on 01/02/2009 8:01:46 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: F15Eagle

Oh I was only a few seconds late, LOL


22 posted on 01/02/2009 8:02:09 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: Red Badger

I saw numerous shows on Science channel/ Discovery etc. where they went over this... and the reason they said there was no crater as a smoking gun was because it hit the ice age canadian shield which had miles thick ice on it.....

pretty cool....


23 posted on 01/02/2009 8:02:12 AM PST by Vaquero ( "an armed society is a polite society" Robert A. Heinlein)
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To: Red Badger
Once the mammoth were gone there was nothing for the tigers to eat.

I guess the point Mitchum was trying to make was: Mammoth. It's what's for dinner.

24 posted on 01/02/2009 8:03:01 AM PST by Tribune7 (Obama wants to put the same crowd that ran Fannie Mae in charge of health care)
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To: Red Badger

LOL - I’ve been cleaning stuff and set the can down too hard and some puffed out. Cleans the nostrils real good.


25 posted on 01/02/2009 8:03:16 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: YdontUleaveLibs

There are several things that we might want to absorb. First...”Comet Warming” destroyed a huge portion of life in North America...and basically formed the Mississippi River and probably over two hundred other rivers. Second...the vast amount of man in North America died, so Man version 2.0...basically came over AFTER 12,900. So we might have had several vast societies in existence. Third and final....we aren’t just talking about just a dozen or two dozen species of life that disappeared here....but we could be talking about a thousand different types of species that disappeared (so that the environmental guys don’t readily blame us for everything).


26 posted on 01/02/2009 8:04:38 AM PST by pepsionice
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To: pctech
The world continues to find every reason under the sun EXCEPT for the Flood in Noah’s days to explain why the animals all died off.

That's because there's zero evidence to support a worldwide flood at any point in the last 3 billion years. Also, my Bible reading may be off, but I only recall one Flood. The Holocene extinction, which saw the end of the saber tooth cat and the woolly mammoth, was fully 65 million years after the extinction of the dinosaurs. How many floods were there?

27 posted on 01/02/2009 8:04:41 AM PST by Alter Kaker (Gravitation is a theory, not a fact. It should be approached with an open mind...)
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To: Scythian

Perhaps you should stop getting your science from the new media?


28 posted on 01/02/2009 8:05:52 AM PST by DevNet
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To: F15Eagle

Three in 30 seconds. What can I say? Great minds think alike.


29 posted on 01/02/2009 8:06:21 AM PST by Vigilanteman (Are there any men left in Washington? Or, are there only cowards? Ahmad Shah Massoud)
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To: NCjim
That would be the Ledbetters of Route Four, Liberty, Mississippi.

Ah, of course. Marcel, Raynelle, Eudelle, W.L., Lynelle, Nuegene, Claude and Clovis. Oh, and Aunt Pet and Uncle Versie, too. Surprisingly enough, Clovis has gone and got hisself a Facebook page. HAWWW!

30 posted on 01/02/2009 8:08:26 AM PST by Charles Martel (Liberals are the crab grass in the lawn of life.)
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To: Vaquero

Which, when it melted when the comet hit would have caused a sudden rise in sea level.....


31 posted on 01/02/2009 8:10:28 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: DevNet

You mean like the story on this thread?


32 posted on 01/02/2009 8:10:50 AM PST by Scythian
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To: Red Badger
...a similar extinction much more recently: just 13,000 years ago....

Then how come there were mammoths, sabertooths and humans in Los Angeles some 9,000 years ago?

33 posted on 01/02/2009 8:11:08 AM PST by onedoug
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To: YdontUleaveLibs
I was never fond of the theory that man hunted the mammoth to extinction.

I agree. Not that man is not capable of driving animals to extinction (the Romans proved that with their games), but the Mammoths were scattered over too wild a territory to be successfully hunted to extinction by cavemen. Now, by 2000 BC, yes, Man could have hunted them down but not at the level man was at 10,000 to 13,000 BC
34 posted on 01/02/2009 8:11:31 AM PST by SoftwareEngineer
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To: Vigilanteman

Yes! LOL


35 posted on 01/02/2009 8:12:28 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: onedoug

They went to the beach and Graumann’s Chinese Theater?


36 posted on 01/02/2009 8:13:57 AM PST by F15Eagle (1 John 5:4-5, 4:15, John 11:25, 14:6, 1 Tim 2:5, John 3:17-18, John 20:31, 1 John 5:13, John 6:69)
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To: pctech
"The world continues to find every reason under the sun EXCEPT for the Flood in Noah’s days to explain why the animals all died off."

Please explain how The Flood could account for the layer of nano-diamonds and soot extending throughout N. America, coinciding with the demise of large mammals.

37 posted on 01/02/2009 8:14:09 AM PST by Justa (The media lied while Americans died.)
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To: Scythian
Xactly.
38 posted on 01/02/2009 8:14:15 AM PST by JasonC
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To: onedoug
Then how come there were mammoths, sabertooths and humans in Los Angeles some 9,000 years ago?

Illegal aliens?.........

39 posted on 01/02/2009 8:14:22 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: DevNet
I'm a big fan of science. This isn't science. It is fantasy novel-writing.
40 posted on 01/02/2009 8:14:56 AM PST by JasonC
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To: xcamel

Ping!..........


41 posted on 01/02/2009 8:15:05 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: Red Badger
Considering that mammoths went extinct 11500 to 11000 years ago, sabertooth cats 10,000 years ago, and Megatherium 8,000 years ago. A comet killing them off over a period of 2,000 - 5,000 after it hit while leaving all other animals intact would be a good trick.

Plus it's amazing how Alligators are always near ground zero for these Asteroid/Comet hits, yet they always manage to survive unscathed.

42 posted on 01/02/2009 8:17:05 AM PST by qam1 (There's been a huge party. All plates and the bottles are empty, all that's left is the bill to pay)
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To: qam1

They go on long vacations:

http://news.bbc.co.uk/2/hi/asia-pacific/7805080.stm


43 posted on 01/02/2009 8:19:58 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: Red Badger

This IS the flood of Noah. Read Velikovsky seminal trilogy: Worlds In Collision, Earth in Upheaval and Ages in Chaos. Then: Ignatius Donneley- Ragnarok, and Vine Deloria- Red Earth, White Lies. This event is recorded in the myths of ancient people the world over. www.kronia.com.


44 posted on 01/02/2009 8:20:42 AM PST by Yollopoliuhqui
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To: Red Badger
There seems to be plenty of evidence of an air blast, or direct hit on the NA ice sheet that ended the last ice age. It also ended the migration from Europe to NA across the ice.
45 posted on 01/02/2009 8:22:43 AM PST by xcamel (The urge to save humanity is always a false front for the urge to rule it. - H. L. Mencken)
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To: evets
I blame Bush.

It's Bush's fault. Bush and those damned SUVs.

Women and minorities hardest hit.

46 posted on 01/02/2009 8:24:15 AM PST by kennedy (I'm a Kennedy with no experience or qualifications too! Where do I sign up for MY Senate seat?)
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To: xcamel
It also ended the migration from Europe to NA across the ice.

Yeah, a big fireball and a flaming hole in the ground the size of Texas would tend to do that.....

47 posted on 01/02/2009 8:24:54 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: SunkenCiv; blam

Ping!............


48 posted on 01/02/2009 8:28:13 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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To: Red Badger

I for one am getting a bit tired of “scientists say”. Lets face it, Al Gore says we have global warming and is backed up by “scientists” and I am still shoveling Gore’s global warming in the form of the heaviest snowfall for many years.

Old honest Al is making a monetary killing on the ignorant citizens of the world.


49 posted on 01/02/2009 8:28:34 AM PST by hgro (Jerry Riversd)
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To: NCjim

I was raised not far from there.....8^)


50 posted on 01/02/2009 8:28:45 AM PST by Red Badger (I was sad because I had no shoes to throw, until I met a reporter who had no feet.....)
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