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Billion-year-old lake deposit yields clues to Earth's ancient biosphere

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A sample of ancient oxygen, teased out of a 1.4-billion-year-old evaporative lake deposit in Ontario, provides fresh evidence of what the Earth's atmosphere and biosphere were like during the interval leading up to the emergence of animal life.

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Unkown User, "Billion-year-old lake deposit yields clues to Earth's ancient biosphere", MachPrinciple, July 30, 2018, https://machprinciple.com/post/Billion-year-old-lake-deposit-yields-clues-to-Earth-s-ancient-biosphere

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