The discussion about the Younger Dryas Impact has heated up again with a flurry of comments in the Proceedings of the National Academy of Sciences of the United States of America concerning the paper:
Israde-Alcántara, I., J. L. Bischoff, G. Domínguez-Vázquezc, H.-C. Li, P. S. DeCarli, T. E. Bunch, J. H. Wittkef, J. C. Weaver, R. B. Firestone, A. West, J. P. Kennett, C. Mercer, S. Xie, E. K. Richman, C. R. Kinzie, and w. S. Wolbach, 2012, Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis. Proceedings of the National Academy of Sciences of the United States of America. vol. 109, no. 13, pp. E738-E747 http://www.pnas.org/content/109/13/E738.abstract The replies, which can be found at http://www.pnas.org/content/early/recent , are 1. Blaauw, M., V. T. Holliday, J. L. Gill, and K. Nicoll, 2012, Age models and the Younger Dryas Impact Hypothesis. PNAS 2012 ; published ahead of print July 24, 2012. 2. Boslough, M., 2012, Inconsistent impact hypotheses for the Younger Dryas. PNAS 2012 ; published ahead of print July 24, 2012. 3. Daulton, T. L., 2012, Suspect cubic diamond “impact” proxy and a suspect lonsdaleite identification. PNAS 2012 ; published ahead of print July 24, 2012. 4. Gill, J. L. J. L. Blois, S. Goring, J. R. Marlon, P. J. Bartlein, K. Nicoll, A. C. Scott, and C. Whitlock, 2012, Paleoecological changes at Lake Cuitzeo were not consistent with an extraterrestrial impact. PNAS 2012 ; published ahead of print July 24, 2012. and 5. Hardiman, M., A. C. Scott, M. E. Collinson, and R. S. Anderson, 2012, Inconsistent redefining of the carbon spherule “impact” proxy. PNAS 2012 ; published ahead of print July 24, 2012. The reply to the above comments, which is also at http://www.pnas.org/content/early/recent , is: Israde-Alcantara, I., J. L. Bischoff, P. S. DeCarli, G. Domínguez-Vázquez, T. E. Bunch, R. B. Firestone, J. P. Kennett, and A. West, 2012, Reply to Blaauw et al., Boslough, Daulton, Gill et al., and Hardiman et al.: Younger Dryas impact proxies in Lake Cuitzeo, Mexico. PNAS 2012 ; published ahead of print July 24, 2012. A related paper is: van Hoesel, A., W. Z. Hoek, F. Braadbaart, J. van der Plicht, G. M. Pennocka, andM. R. Drurya, 2012, Nanodiamonds and wildfire evidence in the Usselo horizon postdate the Allerød-Younger Dryas boundary. Proceedings of the National Academy of Sciences of the United States of America. vol. 109, no. 20, pp. 7648-7653. http://www.pnas.org/content/109/20/7648.abstract Best wishes, Paul H. ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
