Fifteen million years ago Atlantic and Pacific swapped oxygen fortunes

The eastern tropical Pacific Ocean is known for its large low-oxygen zones that are increasing in size, putting marine life at risk. New research shows that 15 million years ago, the opposite was true. A Michigan State University study found that oxygen-deficient waters were distributed very differently during the mid-Miocene Epoch than they are today. The Pacific Ocean’s oxygen-deficient zones were much smaller, while the Atla

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