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River flow over ancient rocks hints when Earth got oxygen

from Futurity

A new study supports the theory that oxygen first appeared in Earth's lower atmosphere 2.7 billion years ago — making life as we know it possible. The sulfur record hidden in ancient rock marks the dramatic change in the planet's atmosphere that gave rise to complex life — but rocks are local indicators. For the big picture, biogeochemists used water that flows over and erodes the rocks as a proxy. more

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