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Study estimates oxygen loss in ancient global ocean

A loss of oxygen in global ocean seawater 94 million years ago led to a mass extinction of marine life that lasted for roughly half a million years.

Oceanic Anoxic Event 2 is easily observed in the Furlo section as a black organic-rich shale 
inbetween white carbonates [Credit: Jeremy Owens]Scientists have found several potential explanations for how the loss of oxygen happened. These could include enhanced volcanic activity,…

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