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Ancient air pockets changing the history of Earth's oxygen

from West Virginia University Eberly College of Arts and Sciences via Science Daily

Geologists are using new direct methods to measure the Earth's oxygenation. They identified, for the first time, exactly how much oxygen was in Earth's atmosphere 813 million years ago — 10.9 percent. This finding, they say, demonstrates that oxygenation on Earth occurred 300 million years earlier than previously concluded from indirect measurements. more


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