Dear friends, There is a new paper on the impact and extinction at the Cretaceous-Tertiary Boundary. It is:
MacLeod1, K. G., Whitney, D. L., , Huber, B. T., and Koeberl, K., 2007, Impact and extinction in remarkably complete Cretaceous-Tertiary boundary sections from Demerara Rise, tropical western North Atlantic. Geological Society of America. vol. 119, no. 1, pp. 101-115. http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2FB25955.1 They found a single, about 2-cm thick, layer of spherules, which is interpreted to a primary air- fall deposit. They found no other spherule layers in the multiple cores of the K-T boundary section, which were recovered. They concluded: "Sedimentological, geochemical, and paleontological changes across the boundary closely match patterns expected for a mass extinction caused by a single impact." Best Regards, Paul Baton Rouge, LA ____________________________________________________________________________________ No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. http://mobile.yahoo.com/mail ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
