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Oxygen's Ups and Downs in the Early Atmosphere and Ocean


October 23, 2012

a carbonate rock in Zimbabwe A team led by geochemists at the University of California, Riverside, challenges the simple notion of an up-only trend for early oxygen on Earth, and provides the first compelling direct evidence for a major drop in oxygen after the gas's first rise. This drop, they say, may have ushered in more than a billion years that were marked by a return to low-oxygen concentrations at Earth's surface, including the likelihood of an oxygen-free deep ocean. Full Story

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University of California, Riverside

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