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Clovis culture comet catastrophe is a myth

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Arcturus
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« on: February 03, 2013, 01:53:01 am »




Wildfire and earth impact. Image: Wikimedia Commons, used under a CC BY-SA 3.0

Clovis culture comet catastrophe is a myth

Article created on Thursday, January 31, 2013
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Researchers from Royal Holloway and the Sandia National Laboratories along with 13 other universities across the United States and Europe, challenge the belief that a large impact or airburst comet or asteroid caused a significant and abrupt change to the Earth’s climate and terminated the Clovis culture. They argue that other explanations must be found for the apparent disappearance.
There was no impact

In simple terms, comet explosions did not end the prehistoric Clovis culture in North America 13,000 years ago, the research is published in the journal Geophysical Monograph Series.

The researchers point to the twin issues of both appropriately sized impact craters from that time period having yet been discovered, nor any unambiguously “shocked” materials found.

In addition, proposed fragmentation and explosion mechanisms “do not conserve energy or momentum,” a basic law of physics that must be satisfied for impact-caused climate change to have any validity, the authors write.

Physics-based models that support the impact hypothesis are in general absent, and those that do exist, contradict the asteroid-impact hypothesizers.

The authors also charge that “several independent researchers have been unable to reproduce reported results” and that samples presented in support of the asteroid impact hypothesis were later discovered by carbon dating to be contaminated with modern material.
Clovis and nano-diamonds
The hallmarks include lumps of glasslike carbon (top), carbon spherules (middle, in cross section), and magnetic grains rich in iridium (bottom). A layer of carbon-rich sediment (arrow) found here at Murray Springs, Ariz.©Cannon Microprobe

The hallmarks include lumps of glasslike carbon (top), carbon spherules (middle, in cross section), and magnetic grains rich in iridium (bottom). A layer of carbon-rich sediment (arrow) found here at Murray Springs, Ariz.©Cannon Microprobe

Clovis is the name archaeologists have given to the earliest well-established human culture in the North American continent. It is named after the town in New Mexico, where distinct stone tools were found in the 1920s and 1930s.

Sandia lead author Mark Boslough is a well respected expert on all things extra-terrestrial and comet related, and has come to the fore as a public voice  since his physics based predictions of the Shoemaker-Levy 9 impact on Jupiter were shown to be absolutely correct.

In the Clovis case, Boslough felt that his ideas were taken further than he could accept when other researchers claimed that the purported demise of Clovis culture in North America was the result of climate change produced by a cluster of comet fragments striking Earth.

In a widely reported press conference announcing the Clovis comet hypothesis in 2007, proponents showed a National Geographic animation based on one of Boslough’s simulations as inspiration for their idea.

Confronted by apparently hard asteroid evidence, as well as a Nova documentary and an article in the journal Science, all purportedly showing his error in rebutting the comet hypothesis, Boslough ordered carbon dating of the major evidence provided by the opposition: nanodiamond-bearing carbon spherules associated with the shock of an asteroid’s impact. The tests found the alleged 13,000-year-old carbon to be of very recent formation.

While this raised red flags to those already critical of the impact hypothesis, “I never said the samples were salted,” Boslough said carefully. “I said they were contaminated.”

That find, along with irregularities reported in the background of one member of the opposing team, was enough for Nova to remove the entire episode from its list of science shows available for streaming, Boslough said.

clovis1
From Clovis to Folsom Point technology

“Just because a culture changed from Clovis to Folsom spear points didn’t mean their civilization collapsed,” he said. “They probably just used another technology. It’s like saying the phonograph culture collapsed and was replaced by the iPod culture.”

Clovis is the name archaeologists have given to the earliest well-established human culture in the North American continent. Clovis people were probably not the first people in the American continents but seem to have been the first big game hunters of the Paleoindian tradition. Their Clovis technology demise coincides with the extinction of the continents megafauna.  However, the following technological culture, called Folsom, clearly shows that people were not ‘wiped out’, but rather altered stone technology to the new form.

Co-author Professor Andrew Scott from the Department of Earth Sciences at Royal Holloway has remarked that “The theory has reached zombie status,  and whenever we are able to show flaws [in the theory] and think it is dead, it reappears with new, equally unsatisfactory, arguments.”

The researcher hopes new versions of the theory will be more carefully examined before they are published.

Source: University of Royal Holloway London/Sandia National Laboratories
More Information
   
Boslough, M., et al. (2012), Arguments and evidence against a Younger Dryas impact event, in Climates, Landscapes, and Civilizations, Geophys. Monogr. Ser., vol. 198, edited by L. Giosan et al. 13–26, AGU, Washington, D. C., doi:10.1029/2012GM001209.J. R. Marlon, P. J. Bartlein, M. K. Walsh, S. P. Harrison, et al. Wildfire responses to abrupt climate change in North America. Proceedings of the National Academy of Science, DOI: 10.1073_pnas.0808212106

    Pringle, H., 2008, Firestorm from space wiped out prehistoric Americans. The New Scientist. vol. 194, no. 2605, pp. 8-9.
    West, A., and A. Goodyear, 2008, The Clovis Comet: Part I:Evidence for a Cosmic Collision 12,900 Years Ago. Mammoth Trumpet. v. 23, no. 1, pp. 1–4.
    “The Younger Dryas Impact Hypothesis”. Scientific American Blog Network. Retrieved 2012-04-15.
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Arcturus
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« Reply #1 on: February 03, 2013, 01:54:03 am »



The hallmarks include lumps of glasslike carbon (top), carbon spherules (middle, in cross section), and magnetic grains rich in iridium (bottom). A layer of carbon-rich sediment (arrow) found here at Murray Springs, Ariz.©Cannon Microprobe
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Arcturus
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« Reply #2 on: February 03, 2013, 01:54:45 am »

http://www.pasthorizonspr.com/index.php/archives/01/2013/clovis-culture-comet-catastrophe-is-a-myth
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Danielle Gorree
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« Reply #3 on: February 03, 2013, 03:39:24 pm »

Study Rebuts Hypothesis That Comet Attacks Ended 9,000-Year-Old Clovis Culture

Jan. 30, 2013 — Rebutting a speculative hypothesis that comet explosions changed Earth's climate sufficiently to end the Clovis culture in North America about 13,000 years ago, Sandia lead author Mark Boslough and researchers from 14 academic institutions assert that other explanations must be found for the apparent disappearance.


"There's no plausible mechanism to get airbursts over an entire continent," said Boslough, a physicist. "For this and other reasons, we conclude that the impact hypothesis is, unfortunately, bogus."

In a December 2012 American Geophysical Union monograph, first available in January, the researchers point out that no appropriately sized impact craters from that time period have been discovered, nor have any unambiguously "shocked" materials been found.

In addition, proposed fragmentation and explosion mechanisms "do not conserve energy or momentum," a basic law of physics that must be satisfied for impact-caused climate change to have validity, the authors write.

Also absent are physics-based models that support the impact hypothesis. Models that do exist, write the authors, contradict the asteroid-impact hypothesizers.

The authors also charge that "several independent researchers have been unable to reproduce reported results" and that samples presented in support of the asteroid impact hypothesis were later discovered by carbon dating to be contaminated with modern material.

The Boslough trail

Boslough has a decades-long history of successfully interpreting the effects of comet and asteroid collisions.

His credibility was on the line on in July 1994 when Eos, the widely read newsletter of the American Geophysical Union, ran a front-page prediction by a Sandia National Laboratories team, led by Boslough, that under certain conditions plumes from the collision of comet Shoemaker-Levy 9 with the planet Jupiter would be visible from Earth.

The Sandia team -- Boslough, Dave Crawford, Allen Robinson and Tim Trucano -- were alone among the world's scientists in offering that possibility.

"It was a **** and could have been embarrassing if we were wrong," said Boslough. "But I had been watching while Shoemaker-Levy 9 made its way across the heavens and realized it would be close enough to the horizon of Jupiter that the plumes would show." His reasoning was backed by simulations from the world's first massively parallel processing supercomputer, Sandia's Intel Paragon.

On the one hand, it was a chance to check the new Paragon's logic against real events, a shakedown run for the defense-oriented machine. On the other, it was a hold-your-breath prediction, a kind of Babe Ruth moment when the Babe is reputed to have pointed to the spot in the center field bleachers he intended to hit the next ball. No other scientists were willing to point the same way, partly due to previous failures in predicting the behavior of comets Kohoutek and Halley, and partly because most astronomers believed the plumes would be hidden behind Jupiter's bulk.

That the plumes indeed proved visible started Boslough on his own trajectory as a media touchstone for things asteroidal and meteoritic.

It didn't hurt that, when he stands before television cameras to discuss celestial impacts, his earnest manner, expressive gestures and extraterrestrial subject matter make him seem a combination of Carl Sagan and Luke Skywalker, or perhaps Tom Sawyer and Indiana Jones.

Standing in jeans, work shirt and hiking boots for the Discovery Channel at the site in Siberia where a mysterious explosion occurred 105 years ago, or discussing it at Sandia with his supercomputer simulations in bold colors on a big screen behind him, the rangy, 6-foot-3 Sandia researcher vividly and accurately explained why the mysterious explosion at Tunguska that decimated hundreds of square miles of trees and whose ejected debris was seen as far away as London most probably was caused neither by flying saucers drunkenly ramming a hillside (a proposed hypothesis) nor by an asteroid striking the Earth's surface, but rather by the fireball of an asteroid airburst -- an asteroid exploding high above ground, like a nuclear bomb, compressed to implosion as it plunged deeper into Earth's thickening, increasingly resistive atmosphere. The governing physics, he said, was precisely the same as for the airburst on Jupiter.

Among later triumphs, Boslough was the Sandia component of a National Geographic team flown to the Libyan Desert to make sense of strange yellow-green glass worn as jewelry by pharaohs in days past. Boslough's take: It was the result of heat on desert sands from a hypervelocity impact caused by an even bigger asteroid burst.

In the present case

In the Clovis case, Boslough felt that his ideas were taken further than he could accept when other researchers claimed that the purported demise of Clovis civilization in North America was the result of climate change produced by a cluster of comet fragments striking Earth.

In a widely reported press conference announcing the Clovis comet hypothesis in 2007, proponents showed a National Geographic animation based on one of Boslough's simulations as inspiration for their idea.

Indiana Jones-style, Boslough responded. Confronted by apparently hard asteroid evidence, as well as a Nova documentary and an article in the journal Science, all purportedly showing his error in rebutting the comet hypothesis, Boslough ordered carbon dating of the major evidence provided by the opposition: nanodiamond-bearing carbon spherules associated with the shock of an asteroid's impact. The tests found the alleged 13,000-year-old carbon to be of very recent formation.

While this raised red flags to those already critical of the impact hypothesis, "I never said the samples were salted," Boslough said carefully. "I said they were contaminated."

That find, along with irregularities reported in the background of one member of the opposing team, was enough for Nova to remove the entire episode from its list of science shows available for streaming, Boslough said.

"Just because a culture changed from Clovis to Folsom spear points didn't mean their civilization collapsed," he said. "They probably just used another technology. It's like saying the phonograph culture collapsed and was replaced by the iPod culture."
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Story Source:

    The above story is reprinted from materials provided by DOE/Sandia National Laboratories.

    Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:

    M. Boslough, K. Nicoll, V. Holliday, T. L. Daulton, D. Meltzer, N. Pinter, A. C. Scott, T. Surovell, P. Claeys, J. Gill, F. Paquay, J. Marlon, P. Bartlein, C. Whitlock, D. Grayson, and A. J. T. Jull. Arguments and Evidence Against a Younger Dryas Impact Event. Climates, Landscapes, and Civilizations, Geophysical Monograph Series, 2012; 198: 13-26 DOI: 10.1029/2012GM001209

Need to cite this story in your essay, paper, or report? Use one of the following formats:
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DOE/Sandia National Laboratories (2013, January 30). Study rebuts hypothesis that comet attacks ended 9,000-year-old Clovis culture. ScienceDaily. Retrieved February 3, 2013, from http://www.sciencedaily.com­ /releases/2013/01/130131095314.htm


« Last Edit: February 03, 2013, 03:41:33 pm by Danielle Gorree » Report Spam   Logged
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« Reply #4 on: February 03, 2013, 03:40:39 pm »



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