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News From the Field
Researchers quantify toxic ocean conditions during major extinction 93.9 million years ago

October 28, 2013

view of an ocean A research team led by University of California, Riverside, biogeochemists reports that oxygen-free and hydrogen sulfide-rich waters extended across roughly 5 percent of the ocean 93.9 million years ago--far more than the modern ocean's 0.1 percent but much less than previous estimates for this event. Across this event, a major biological extinction in the marine realm took place. The new work shows that only portions of the ocean need to contain sulfide to greatly impact biota. Full Story

University of California, Riverside

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