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

From: Paul <bristolia_at_meteoritecentral.com>
Date: Wed, 25 Mar 2009 06:50:45 -0700 (PDT)
Message-ID: <677638.17236.qm_at_web36207.mail.mud.yahoo.com>

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


      
Received on Wed 25 Mar 2009 09:50:45 AM PDT