[meteorite-list] Impact Origin of Carolina Bays Argued For at 2007AGU Meeting

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Tue, 13 Mar 2007 09:35:21 -0700 (PDT)
Message-ID: <458438.57613.qm_at_web36909.mail.mud.yahoo.com>

Sterling, all

The impacts which ended the last ice age are covered
in Man and Impact in the Americas, as is the mechanism
which brought the last ice aqge to an end.

My opinion is that the climatic effects of these
impacts most likely finished off mosat of the the
mega0fauna though effects on their food supplies.
 
Ed


--- "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
wrote:

> Hi, List,
>
> Thanks, Paul, for those links.
>
> If you're not familiar with the Carolina Bays,
> Listees, here's a page with links to every theory
> about them:
> http://abob.libs.uga.edu/bobk/cbaymenu.html
>
> Some fascinating and non-fascinating things
> here. The list of logical connections that may mean
> nothing at all is very long.
>
> Was there a mammoth extinction event? Most
> diggers, bonemen, and that crowd say no, but on the
> other hand when's the last time you saw a mammoth?
>
> Why would a mild cooling spell extinct a
> cold-adapted
> mammal like the mammoth? Did the mammoths die
> out at once or over 1000 years? 2000 years? 4000
> years?
>
> How fast is an "event"? How slow? With an ice
> age
> ending, how badly do you need an impact to explain
> extinctions? As far as that goes, how big an impact
> event do you need to explain an excess of frog ponds
> in the Carolinas?
>
> One of the presenters has advocated that the
> Bays
> formed by steam explosions from a thermal airburst
> event, formed out of beaver ponds, a particularly
> choice
> notion in view of the fact that one of the fauna
> extincted
> was the Giant Beaver!
>
> North America lost 5 species of American Horses,
> a
> few species of Western Camels, the North American
> llamas,
> two genera of Deer, two genera of Pronghorns, the
> Stag-Moose,
> Shrub-Oxen, Woodland Muskoxen, the Giant Beaver, the
> Shasta Ground Sloth and other Ground Sloths,
> Short-Faced
> Bears like the Cave Bear (big), Saber-toothed cats,
> the American
> Lion (bigger than the African Lion), the American
> Cheetah,
> the Dire Wolf, several species of Mammoth, the
> American
> Mastodont (Mammut americanum), the Giant Bison, and
> the
> Giant Peccary (the super Pig)!
>
> Altogether, in 50,000 years North America lost
> 33 genera
> of large mammals, and 15 genera in the period from
> 11,500
> to 10,000 years ago. At least, we don't have to
> worry about
> the Bunyip (a Giant Killer Bunny Wabbit The Size of
> A Truck).
> The Diprotodon is Australia's problem...
>
> Worthy of note: the inclusion of Luann Becker,
> who I
> suspect has something to do with the "newly
> uncovered
> evidence for ET impact at 12.9 ka including
> end-Clovis age
> sediments throughout North America with high levels
> of
> Iridium, magnetic [sic., probably magnetite] and
> carbon,
> spherules, glass-like carbon, fullerenes, and ET
> noble gas
> ratios often in association with carbonaceous black
> layers
> and succeeded by black mats with unusual biota."
> Particularly with those fullerenes!
>
> Firestone, who is an expert on isotopes (he
> wrote
> the book on them, literally; he is the Chief Editor
> of the
> Table of Isotopes, 8th Edition). I would not doubt
> anything he says... about isotopes. But he has
> advanced
> some utterly ridiculous explanations of his
> findings, such
> as "interstellar comets formed in a supernova"
> impacting
> at -- what was it? -- 10,000 miles per second? This
> naturally tends to make people dismiss the while
> thing.
>
> However, there is no reason why, as the world
> expert
> on isotopes, he would be any better at explaining
> how
> they got there than say, a Ph.D. in French
> Literature
> would be... or an Economist.
>
> Something happened. No one really knows what.
> It left traces. No one really knows whether they
> imply
> any other events or not. Whole genera of animals
> became
> extinct. No one knows if there's any connection. The
> list of what we don't know is much longer than the
> list of what we do.
>
> And if you're wondering what the Younger Dryas
> is... After the ice age started to end and the ice
> caps
> started to melt rapidly, they suddenly slowed down
> and almost stopped melting, then they began to
> rapidly
> melt again after the Younger Dryas. Obviously, a
> cooling episode... well, maybe.
>
> It can be explained by the fact that what was
> melting
> the ice caps was a rapid warming of the glacial
> climate
> by mid-level warm oceanic water flows to the poles.
> When
> the polar began to melt in earnest, the runoff of
> cold fresh
> water into polar seas slowed and almost stopped
> those
> warm flows. After that initial runoff, the warm
> currents
> resumed and the ice caps were doomed.
>
> No comets, impacts, nor any other exotic event
> is
> required by way of explanation. No "cooling" is
> needed,
> just a weakening of an ocean current, an oscillation
> in
> the warming process caused by the warming itself.
>
> Global warming -- ya gotta love it.
>
>
> Sterling K. Webb
>
--------------------------------------------------------------------
> ----- Original Message -----
> From: "Paul" <bristolia at yahoo.com>
> To: <meteorite-list at meteoritecentral.com>
> Sent: Saturday, March 10, 2007 2:00 PM
> Subject: [meteorite-list] Impact Origin of Carolina
> Bays Argued For at
> 2007AGU Meeting
>
>
> Dear Friends,
>
> Apparently, there is going to be some interesting
> papers
> at the 2007 Joint Assembly of the American
> Geophysical
> Union as there will be a session presenting evidence
> for
> an impact having occurred during Younger-Dyras times
> at the "end of the last Ice Age. Below are links to
> representative abstracts:
>
> 1. Evidence for an Extraterrestrial Impact Event
> 12,900 years
> ago that Contributed to Megafaunal Extinctions and
> the Younger
> Dryas Cooling
>
>
http://submissions5.agu.org/aguconvener/ConvenerView.asp?ref=1388
>
>
> 2. Formation of the Carolina Bays: ET Impact vs.
> Wind-and-Water
>
>
http://submissions5.agu.org/aguconvener/ConvenerView.asp?ref=1334
>
> 3. Extraterrestrial Markers Found at Clovis Sites
> Across North
> America
>
>
http://submissions5.agu.org/aguconvener/ConvenerView.asp?ref=1393
>
>
> 4. Is There Evidence for Impact-Triggered Fires at
> the End
> Pleistocene?
>
>
http://submissions5.agu.org/aguconvener/ConvenerView.asp?ref=513
>
> The session itself is " PP05: New Insights into
> Younger Dryas
> Climatic Instability, Mass Extinction, the Clovis
> People, and
> Extraterrestrial Impacts
>
>
http://www.agu.org/meetings/ja07/?content=search&show=detail&sessid=159
>
>
> It looks like Firestone and his supporters are
> refining their
> arguments and dropping the implausible ones, i.e.
> the so-called
> meteor crater in Lake Michigan, and concentrating on
> what they
> regard the basic evidence for their ideas.
>
> Best Regards,
>
> Paul H.
>
>
>
>
>
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Received on Tue 13 Mar 2007 12:35:21 PM PDT