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*sigh*

Chemostratigraphic Evidence of Deccan Volcanism from the Marine Osmium Isotope Record

Science 21 November 2003: Vol. 302. no. 5649, pp. 1392 - 1395 DOI: 10.1126/science.1089209

Continental flood basalt (CFB) volcanism is hypothesized to have played a causative role in global climate change and mass extinctions. Uncertainties associated with radiometric dating preclude a clear chronological assessment of the environmental consequences of CFB volcanism. Our results document a 25% decline in the marine 187Os/188Os record that predates the Cretaceous-Tertiary boundary (KTB) and coincides with late Maastrichtian warming. We argue that this decline provides a chemostratigraphic marker of Deccan volcanism and thus constitutes compelling evidence that the main environmental consequence of Deccan volcanism was a transient global warming event of 3° to 5°C that is fully resolved from the KTB mass extinction.

1 Department of Geology and Geophysics, University of Hawaii, Honolulu, HI 96822–2225, USA. 2 Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA 02543, USA.

So this asteroid caused Osmium levels to decrease thousands/millions of years before it actually hit??

LOL! These Asteroid people with their computer models and evidence cherry picking are almost as bad as the Global Warming Religionist

Decades ago, I watched some documentary that theorized the elephants, among most other life in the US/Canadian area were wiped out by volcanoes in the Western part of the continent.

Supposedly, fossils revealed enough to determine that a good number died from ash suffocation, and those that didn't, died from starvation, that is the ash either covered "food", or was so thick, the animals couldn't move to scavenge.