Oxygen-Free Early Oceans

Date: 1/6/2011

Geologists at the University of California found chemical evidence in 2.6 billion year old rocks indicating oceans were oxygen-free and contained abundant hydrogen sulfide in some areas. This adds to growing evidence showing that ancient ocean chemistry was more complex than previously imagined and likely influenced life’s evolution on Earth in unexpected ways – eg delaying the appearance and proliferation of some key groups of organisms, said Timothy Lyons, a professor of biogeo-chemistry and the senior investigator for the study.

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