Toxic ocean conditions during major extinction 93.9 million years ago quantified: Doesn't take much sulfide to impact ocean life

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.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/4...