Copyrighted Image? DMCA | Biogeochemists report that oxygen-free and hydrogen sulfide-rich waters extended across roughly five 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. |
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