Oxygen flooded Earth’s atmosphere earlier than thought

Volcanism and global glaciation coincided to the gas’s rise

Banded iron

OXYGEN’S ORIGINS  The rise of oxygen in Earth’s atmosphere and oceans, known as the Great Oxidation Event, began around 100 million years earlier than previously thought, new research suggests. The oxygen’s presence left a mark in the geologic record, such as this 2.1-billion-year-old banded iron formation.

André Karwath aka Aka/Wikimedia Commons (CC BY-SA 2.5)

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