Skip to comments.Evidence for an extraterrestrial impact 12,900 years ago
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.
Not this time if the "Ankle Goddess" is in charge! /s
Another repeat by The History Channel...
True.. I’ve seen similar stuff on pbs and elsewhere as well..
You forgot "of color"...
Al Sharpton earned a free spat at you for that lack of compassion shown. ; )
It is He3, the same He3 some think they can mine profitably from the moon. Why bother with the moon when it's right here in the Carolina Bays?
Nat King Cole conveyed it best in song with his tune "Smile".
He must have been a conservative minded soul.
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
I don't think so.
Also Jimmy Carter is old, I don't think he's THAT old.
I don't think so.
Although Jimmy Carter is old, I don't think he's THAT old.
Disregard #27, the fingers are faster than their promoter!
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.”
The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Just adding to the catalog, not sending a general distribution.
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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!
"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 ;^)
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.
Mark for later discussion.
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?
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.
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