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 ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
