Anoxia and Euxinia Ocean Environmental Change

[prokaryotes]

A compilation of the science and current research

These findings support an episode of ocean acidification coincident with the major biotic crisis. The Mo and U isotope records exhibit significant rapid negative anomalies at the onset of the main extinction interval, suggesting rapid expansion of anoxic and euxinic marine bottom waters during the extinction interval. The rapidity of the isotope excursions in Mo and U suggests substantially reduced residence times of these elements in seawater relative to the modern, consistent with expectations for a time of widespread anoxia.

http://climatestate.com/2013/09/21/euxinia-and-anoxic-ocean-environmental-change/