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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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A link was provided to this paper in a news article discussion earlier this week. Here is the full abstract FYI.
1 posted on 09/30/2007 10:14:31 AM PDT by baynut
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To: baynut

This happened 12,900 years ago and it’s breaking news?


2 posted on 09/30/2007 10:19:05 AM PDT by MediaMole
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To: SunkenCiv; blam

Catastrophism.


3 posted on 09/30/2007 10:22:33 AM PDT by Lurker ( Comparing moderate islam to extremist islam is like comparing smallpox to ebola.)
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To: baynut

Is there a babelfish translation of this?


4 posted on 09/30/2007 10:22:36 AM PDT by doug from upland (Stopping Hillary should be a FreeRepublic Manhattan Project)
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To: Lurker; baynut
Ice Age Ends Smashingly: Did A Comet Blow Up Over Eastern Canada? (Carolina Bays)
5 posted on 09/30/2007 10:23:58 AM PDT by blam (Secure the border and enforce the law)
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To: baynut

Bush’s fault.


6 posted on 09/30/2007 10:24:11 AM PDT by magellan
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To: baynut

Bush’s fault.


7 posted on 09/30/2007 10:24:21 AM PDT by RightOnTheLeftCoast ([Thompson 2008!])
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To: magellan

Wow! Great minds think alike!


8 posted on 09/30/2007 10:24:51 AM PDT by RightOnTheLeftCoast ([Thompson 2008!])
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To: doug from upland
"Is there a babelfish translation of this?"

Big rock fall down go boom.
9 posted on 09/30/2007 10:26:06 AM PDT by RightOnTheLeftCoast ([Thompson 2008!])
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To: MediaMole
This happened 12,900 years ago and it’s breaking news?

Relatively speaking. /snicker

10 posted on 09/30/2007 10:26:29 AM PDT by EGPWS (Trust in God, question everyone else)
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To: baynut
Could someone translate this for those of us who aren’t MIT grads?
11 posted on 09/30/2007 10:27:21 AM PDT by Gay State Conservative (If martyrdom is so cool,why does Osama Obama go to such great lengths to avoid it?)
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To: baynut

Stuff happens.

Saw a good program on History channel very recently about MegaDisassers, including impacts by comets and such and the residue left behind and other physical evidence of some pretty good hits..


12 posted on 09/30/2007 10:27:40 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: MediaMole
RE: # 2

This happened 12,900 years ago and it’s breaking news? Hell, that's not so bad -- it'll take longer than that for the MSM to get around to publishing any good news out of Iraq>

13 posted on 09/30/2007 10:31:21 AM PDT by Turret Gunner A20 (.... when you really start to pay attention, you automatically become a conservative.)
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To: magellan
Bush’s fault.

His ancestors were visionaries and worked hard at guaranteeing the demise of the democratic party today.

Don't underestimate the focus of the VRWC. LOL!

14 posted on 09/30/2007 10:31:21 AM PDT by EGPWS (Trust in God, question everyone else)
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To: doug from upland
Here it is in Swedish Chef....

A cerbun-reech bleck leyer, deteeng tu 12.9 ka, hes beee prefeeuoosly identeeffied et 50 Clufees-ege-a seetes ecruss Nurt Emereeca und eppeers cuntempuruneuoos veet zee ebroopt oonset ooff Yuoonger Dryes (YD) cuuleeng. Zee in seetoo bunes ooff ixteenct Pleeestucene-a megeffoona, elung veet Clufees tuul essembleges, ooccoor beloo thees bleck leyer boot nut veethin oor ebufe-a it. Cooses fur zee ixteencshuns, YD cuuleeng, und termeeneshun ooff Clufees cooltoore-a hefe-a lung beee cuntruferseeel. In thees peper, ve-a prufeede-a ifeedence-a fur un ixtreterrestreeel (IT) impect ifent et 12.9 ka, vheech ve-a hypuzeeseeze-a coosed ebroopt infurunmentel chunges thet cuntreebooted tu YD cuuleeng, mejur iculugeecel reurguneezeshun, brued-scele-a ixteencshuns, und repeed hoomun behefeeurel sheeffts et zee ind ooff zee Clufees Pereeud. Clufees-ege-a seetes in Nurt Emereecun ere-a ooferleeen by a theen, deescrete-a leyer veet feryeeng peek eboondunces ooff (i)megneteec greeens veet ireedioom, (iee) megneteec meecruspherooles, (ieei) chercuel, (if) suut, (f) cerbun spherooles, (fee) gless-leeke-a cerbun cunteeening nunudeeemunds, und (feei) foollerenes veet IT heleeoom, ell ooff vheech ere-a ifeedence-a fur un IT impect und essuceeeted beeumess boorneeng et 12.9 ka. Thees leyer elsu ixtends thruooghuoot et leest 15 Ceruleena Beys, vheech ere-a uneeqooe-a, illeepticel depresseeuns, ooreeented tu zee nurthvest ecruss zee Etlunteec Cuestel Pleeen. Ve-a prupuse-a thet oone-a oor mure-a lerge-a, loo-denseety IT oobjects ixpluded oofer nurzeern Nurt Emereeca, perteeelly destebeelizing zee Loorenteede-a Ice-a Sheet und treeggering YD cuuleeng. Zee shuck vefe-a, zeermel poolse-a, und ifent-releted infurunmentel iffffects (i.g., ixtenseefe-a beeumess boorneeng und fuud leemiteshuns) cuntreebooted tu ind-Pleeestucene-a megeffoonel ixteencshuns und edepteefe-a sheeffts emung PeleuEmereecuns in Nurt Emereeca.

15 posted on 09/30/2007 10:31:31 AM PDT by OSHA (Liberals will lick the boot on their necks if they think the other boot is on yours and mine.)
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To: Gay State Conservative

Here’s a good background article, gay state:

New Theory: Did a Prehistoric Comet ‘Kill’ North America?
http://www.santabarbaranewsroom.com/news/science-news/new-theory-did-a-prehistoric-comet-kill-north-america.html


16 posted on 09/30/2007 10:32:42 AM PDT by baynut
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To: baynut

They’re coming to take me away.


17 posted on 09/30/2007 10:32:45 AM PDT by Running On Empty (The three sorriest words: "It's too late")
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To: Turret Gunner A20
it'll take longer than that for the MSM to get around to publishing any good news out of Iraq

We're only talking 10's of thousands of years here.

The MSM must seeing a bit of light. ; )

18 posted on 09/30/2007 10:34:09 AM PDT by EGPWS (Trust in God, question everyone else)
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To: NormsRevenge
Saw a good program on History channel very recently about MegaDisassers, including impacts by comets and such and the residue left behind and other physical evidence of some pretty good hits..

Another repeat by The History Channel...

19 posted on 09/30/2007 10:36:45 AM PDT by EGPWS (Trust in God, question everyone else)
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To: baynut
Evidence for an extraterrestrial impact 12,900 years ago

Neanderthal women and children hardest hit.

20 posted on 09/30/2007 10:36:56 AM PDT by Alex Murphy ("Therefore the prudent keep silent at that time, for it is an evil time." - Amos 5:13)
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