[meteorite-list] Kennett Talk and NOVA special on Younger Dryas Impacts Question?

[Steve Dunklee]

If a c chondrite or comet with considerable amount of carbon exploded over the polar ice sheet , could it create the nano diamonds without leaving behind a crater? as in an ice crater that melted? or was the land bridge in the Bearing Straits really an ice bridge? and was Northwest Africa made into a green paradise while north America was covered in ice? It seems to me the impact would have had a global effect causing winter everywhere for a while, including Africa. What supporting evidence can be found elsewhere? I am not trying to discount the research but believe there will be found other supporting data on a global scale. A time machine would be pretty handy to see what really happened!
have a great day!
and be thankful you never get hit by a train
Steve

--- On Wed, 3/25/09, Paul <bristolia at yahoo.com> wrote:


> From: Paul <bristolia at yahoo.com>

> Subject: [meteorite-list] Kennett Talk and NOVA special on Younger Dryas Impacts

> To: meteorite-list at meteoritecentral.com

> Date: Wednesday, March 25, 2009, 8:50 AM

> 

> E.P. Grondine mentioned the below NOVA Special in his

> post,

> “[meteorite-list] NOVA special on Holocene Start Impacts

> and AD”.

> 

> PBS Program to Feature Two UMaine Scientists, March 23,

> 2009

> http://www.umaine.edu/news/view_release.php?x=1237809989

> 

> Dr. Kennett gave a talk, which included a lot of research

> that is either 

> being prepared for publication, been submitted for

> publication, and in 

> press. Dr. Kennett made a very convincing case that

> something unique, 

> extraordinary, and instantaneous occurred at the beginning

> of the 

> Younger Dryas about 12,900 B. calender years ago and could

> be an 

> event that was extraterrestrial in nature. His idea that it

> involved  

> multiple, simultaneous Tunguska-like events occurring

> across the 

> North American continent.

> 

> He also, discussed and showed pictures of the research on

> the 

> Greenland ice sheet, carried out by Paul Mayewski, and

> Andrei 

> Kurbatov. Outcropping along the edge of the Greenland Ice

> Sheet

> is a well defined Younger Dryas bed, which consists of dark

> grey

> dusty ice with clean, white Holocene ice above it and

> clean, white 

> terminal Pleistocene ice below it. They found the

> nannodiamonds

> and other alleged impact indicators right at and only at

> the basal

> contact of the Younger Dryas ice layer. They found exactly

> what 

> would be expected for an layer of meteoritic debris from

> Tunguska-

> like events. 

> 

> This is a show that you do not want to miss.

> 

> It is in the realm of possibility, that decade or so from

> now, Dr. 

> West, Dr. Kennett, and other members the YDB Group will

> likely 

> be known as the "Walter Alvarezes of the Quaternary.

> 

> I am now getting together with a couple of archaeologists

> to do 

> some “prospecting” for nannodiamonds and

> microspherules.

> 

> Some relevant publications:

> 

> Haynes, V. C., Jr., 2008, Younger Dryas “black mats”

> and the 

> Rancholabrean termination in North America. Proceedings of

> the

> National Academy of Sciences. vol. 105  no. 18 

> 6520-6525

> http://www.pnas.org/content/105/18/6520.abstract

> 

> Did a Significant Cool Spell Mark the Demise of Megafauna?

> http://uanews.org/node/19409

> 

> Kennett, J.D., J.P. Kennett, G.J. West, J.M. Erlandson,

> J.R. 

> Johnson, I.L. Hendy, A. West, B.J. Culleton, T.L. Jones and

> 

> Thomas W. Stafford Jr., 2008, Quaternary Science Reviews.

> vol. 27, no. 27-28, pp. 2530-2545.

> http://dx.doi.org/10.1016/j.quascirev.2008.09.006

> 

> Kennett, D.J., J. P. Kennett, A. West, C. Mercer, S. S. Que

> 

> Hee, and L. Bement, 2009, Nanodiamonds in the Younger Dryas

> 

> Boundary Sediment Layer. Science. vol. 323, no. 5910, p.

> 94.

> http://www.sciencemag.org/cgi/content/abstract/323/5910/94

> 

> Best Regards,

> 

> Paul H

> 

> 

>       

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