Rapid oxygenation of Earths atmosphere 2.33 billion years ago

What is it about?

This paper identified the time when Earth's atmosphere transfored from anoxic to oxic on the basis of chemical signals preserved in rocks.

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Why is it important?

When and how did O2 start to accumulate in Earth's atmosphere? Where were the O2 from? How did the accumulation of O2 in the atmosphere affect the biotic evolution and Earth surface environments including climate? This paper sets up a temporal framwork to solve these questions.