Ancient air trapped in rock salt for 813 million years is changing the timeline of atmospheric changes and life on Earth. Geologists say that oxygenation on Earth occurred 300 million years earlier than previously concluded from indirect measurements.

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Ancient air trapped in rock salt for 813 million years is changing the timeline of atmospheric changes and life on Earth. Geologists say that oxygenation on Earth occurred 300 million years earlier than previously concluded from indirect measurements.