A recently published paper argues that the Permian-Triassic extinction was not caused by an asteroid or comet impact. The paper is:
E. Heydari and J. Hassanzadeh. 2003, Deev Jahi Model of the Permian-Triassic boundary mass extinction: a case for gas hydrates as the main cause of biological crisis on Earth. vol. 163, no.1-2, pp. 147-163 (15 December 2003) The abstract concluded: "The study suggests that prior to cement precipitation, the PTB ocean was charged with CO2, warm, had low oxygen, high Ca2+, and high HCO3- concentrations. These conditions collectively created stressful conditions causing the marine mass mortality. The leakage of CH4 to the atmosphere produced a super-hot climate resulting in the biological devastation on land. The proposed kill mechanism is developed on the basis of the physical clue--the cement layer--left behind by the killing process--the change in ocean chemistry." Yours, Paul Baton Rouge, LA __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/ ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
