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Evidence for an extraterrestrial impact 12,900 years ago
Proceedings of the National Academy of Sciences, October 9, 2007, Vol. 104 ^ | Setember 27, 2007 | R. B. Firestone, et. al.

Posted on 09/30/2007 10:14:28 AM PDT by baynut

A carbon-rich black layer, dating to 12.9 ka, has been previously identified at 50 Clovis-age sites across North America and appears contemporaneous with the abrupt onset of Younger Dryas (YD) cooling. The in situ bones of extinct Pleistocene megafauna, along with Clovis tool assemblages, occur below this black layer but not within or above it. Causes for the extinctions, YD cooling, and termination of Clovis culture have long been controversial. In this paper, we provide evidence for an extraterrestrial (ET) impact event at 12.9 ka, which we hypothesize caused abrupt environmental changes that contributed to YD cooling, major ecological reorganization, broad-scale extinctions, and rapid human behavioral shifts at the end of the Clovis Period. Clovis-age sites in North American are overlain by a thin, discrete layer with varying peak abundances of (i)magnetic grains with iridium, (ii) magnetic microspherules, (iii) charcoal, (iv) soot, (v) carbon spherules, (vi) glass-like carbon containing nanodiamonds, and (vii) fullerenes with ET helium, all of which are evidence for an ET impact and associated biomass burning at 12.9 ka. This layer also extends throughout at least 15 Carolina Bays, which are unique, elliptical depressions, oriented to the northwest across the Atlantic Coastal Plain. We propose that one or more large, low-density ET objects exploded over northern North America, partially destabilizing the Laurentide Ice Sheet and triggering YD cooling. The shock wave, thermal pulse, and event-related environmental effects (e.g., extensive biomass burning and food limitations) contributed to end-Pleistocene megafaunal extinctions and adaptive shifts among PaleoAmericans in North America.


TOPICS: Science
KEYWORDS: catastrophe; catastrophism; climate; clovis; clovisimpact; comet; extinction; godsgravesglyphs; impact; meadowcroft
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To: RightOnTheLeftCoast
Big rock fall down go boom.

Not this time if the "Ankle Goddess" is in charge! /s

21 posted on 09/30/2007 10:39:29 AM PDT by EGPWS (Trust in God, question everyone else)
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To: EGPWS

Another repeat by The History Channel...

True.. I’ve seen similar stuff on pbs and elsewhere as well..


22 posted on 09/30/2007 10:42:08 AM PDT by NormsRevenge (Semper Fi ... Godspeed ... ICE’s toll-free tip hotline—1-866-DHS-2-ICE ... 9/11 .. Never FoRget!!!)
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To: Alex Murphy
Neanderthal women and children hardest hit.

ROTF!

You forgot "of color"...

Al Sharpton earned a free spat at you for that lack of compassion shown. ; )

23 posted on 09/30/2007 10:43:25 AM PDT by EGPWS (Trust in God, question everyone else)
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To: baynut

24 posted on 09/30/2007 10:44:43 AM PDT by RightWhale (25 degrees today. Phase state change accomplished.)
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To: Lurker
Catastrophism.

Nat King Cole conveyed it best in song with his tune "Smile".

He must have been a conservative minded soul.

25 posted on 09/30/2007 10:47:16 AM PDT by EGPWS (Trust in God, question everyone else)
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To: EGPWS
Next Sunday night, the season premier of the National Geographic Channel's "Explorer" series will specifically concern this discovery:

Explorer: Mammoth Mystery [TV-G]
Sunday, October 7, 2007, at 10P

Also airs: Monday, October 8, 1A Wednesday, October 10, 8P Scientists have long debated one of the greatest mysteries of science: What caused the sudden mass extinction of mammoths 13,000 years ago? Now, Explorer: Mammoth Mystery gathers a team of investigators who may have found clues to why the mammoths, which reigned over the landscapes of North America for more than 1 million years, suddenly vanished. Could the clues point to the biggest cosmic impact humans have ever witnessed? http://channel.nationalgeographic.com/channel/ET/popup/200710072200.html

26 posted on 09/30/2007 10:50:09 AM PDT by baynut
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To: baynut
Could the clues point to the biggest cosmic impact humans have ever witnessed?

I don't think so.

Also Jimmy Carter is old, I don't think he's THAT old.

27 posted on 09/30/2007 10:52:59 AM PDT by EGPWS (Trust in God, question everyone else)
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To: baynut
Could the clues point to the biggest cosmic impact humans have ever witnessed?

I don't think so.

Although Jimmy Carter is old, I don't think he's THAT old.

28 posted on 09/30/2007 10:53:58 AM PDT by EGPWS (Trust in God, question everyone else)
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To: EGPWS

Disregard #27, the fingers are faster than their promoter!


29 posted on 09/30/2007 10:55:12 AM PDT by EGPWS (Trust in God, question everyone else)
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To: doug from upland

Yoda translates: “ Of extinct pleistocene megafauna the in situ bones, with clovis tool assemblages along, within or above it occur below this black layer but not. Hmmmmmm.”


30 posted on 09/30/2007 4:12:02 PM PDT by BenLurkin
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To: Lurker
Thanks lurker.

The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization

by Richard Firestone,
Allen West, and
Simon Warwick-Smith


31 posted on 10/01/2007 12:39:19 PM PDT by SunkenCiv (Profile updated Wednesday, September 27, 2007. https://secure.freerepublic.com/donate/)
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To: blam

· join list or digest · view topics · view or post blog · bookmark · post a topic ·

 
Gods
Graves
Glyphs
Just adding to the catalog, not sending a general distribution.

To all -- please ping me to other topics which are appropriate for the GGG list.
GGG managers are Blam, StayAt HomeMother, and Ernest_at_the_Beach
 

· Google · Archaeologica · ArchaeoBlog · Archaeology magazine · Biblical Archaeology Society ·
· Mirabilis · Texas AM Anthropology News · Yahoo Anthro & Archaeo ·
· History or Science & Nature Podcasts · Excerpt, or Link only? · cgk's list of ping lists ·


32 posted on 10/01/2007 12:40:44 PM PDT by SunkenCiv (Profile updated Wednesday, September 27, 2007. https://secure.freerepublic.com/donate/)
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To: 75thOVI; AFPhys; Alice in Wonderland; AndrewC; aristotleman; Avoiding_Sulla; BenLurkin; Berosus; ...
There have been a bunch of similar topics lately, but this is a big deal.
 
Catastrophism
· join · view topics · view or post blog · bookmark · post new topic ·

33 posted on 10/01/2007 12:42:05 PM PDT by SunkenCiv (Profile updated Wednesday, September 27, 2007. https://secure.freerepublic.com/donate/)
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To: SunkenCiv; baynut
...but this is a big deal.

Indeed it is a big deal. In geologic times, this happened yesterday! Some heavy hitters in the paleo business have gotten on board this train so look for the textbooks to be changing soon. VERY interesting stuff when you think about some of the ancient texts derived from oral "myths" possibly referencing some of these goings on.

Civ I don't know if you noticed, but the supernova/gamma ray burst/cosmic bombardment association seems to have disappeared -- or has it?

baynut, I ran through the article fairly quickly, so I many have missed something, but it still doesn't appear to shed any additional light on the origin of the Bays. I'll have to take another look at it this evening when I've got a little more time. Good post!

34 posted on 10/01/2007 2:27:50 PM PDT by ForGod'sSake (ABCNNBCBS: An enemy at the gates is less formidable, for he is known and carries his banner openly.)
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To: baynut; SunkenCiv; blam; Fred Nerks; gleeaikin; Renfield; Coyoteman
BTW, from this OLD THREAD:

"After the year that has elapsed since the article was published, however, the authors no longer agree about the events theorized in their article. Firestone's reply is printed below. Topping declined to respond, pending new experimental data."

William Topping has responded, but not soon enough apparently to make the Mammoth Trumpet's cutoff, and if fact was never posted there. Found it HERE(much of his counter-rebuttal to Southon/Taylor's rebuttal has been included in the article this thread is based on).

I didn't read it closely enough to see where Firestone and Topping may have parted ways(if in fact they did); a little technical for an old salesman ;^)

35 posted on 10/01/2007 8:45:21 PM PDT by ForGod'sSake (ABCNNBCBS: An enemy at the gates is less formidable, for he is known and carries his banner openly.)
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To: ForGod'sSake
Civ I don't know if you noticed, but the supernova/gamma ray burst/cosmic bombardment association seems to have disappeared -- or has it?
Some years ago, there was a book in which the author put forward a model for K-T extinction due to supernova; I tried to get into it, but didn't find it compelling. I don't recall the author's name or the book's title, or anything that would be useful for this anecdote. Nuts.

But anyway, the "Cycles..." book (see above) has some integration of (mostly) Native American folklore which they link to the impact. S'cool, but not a necessity for their model.
36 posted on 10/01/2007 10:11:30 PM PDT by SunkenCiv (Profile updated Wednesday, September 27, 2007. https://secure.freerepublic.com/donate/)
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To: ForGod'sSake

Wow, thanks!

http://www.freerepublic.com/focus/chat/1904474/posts?page=35#35


37 posted on 10/01/2007 10:12:22 PM PDT by SunkenCiv (Profile updated Wednesday, September 27, 2007. https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Mark for later discussion.


38 posted on 10/02/2007 5:04:34 AM PDT by Renfield (How come there aren't any football teams with pink uniforms?)
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To: SunkenCiv; Coyoteman; baynut
Some years ago, there was a book in which the author put forward a model for K-T extinction due to supernova...

The ORIGINAL ARTICLE(w/Topping) made several references to the liklihood(?) of a hit from a supernova. Conspicuously missing from the article cited for this thread along with another theory; that is, carbon dates, particularly associated with paleoindian dates, were quite possibly much too young -- by about 40,000 - 50,000 years. I gather that theory has been abandoned. Which MAY be why Topping is back in the references and cites in the article on THIS thread?

39 posted on 10/02/2007 7:36:07 AM PDT by ForGod'sSake (ABCNNBCBS: An enemy at the gates is less formidable, for he is known and carries his banner openly.)
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To: ForGod'sSake
Conspicuously missing from the article cited for this thread along with another theory; that is, carbon dates, particularly associated with paleoindian dates, were quite possibly much too young -- by about 40,000 - 50,000 years. I gather that theory has been abandoned.

I was never very comfortable with that idea. I think they are on a better track with this current article. And, they seem to have some pretty good evidence.

40 posted on 10/02/2007 8:18:28 AM PDT by Coyoteman (Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.)
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