2800–2500 million years ago
The Neoarchean spans the period from Earth.—the period being defined chronometrically and not referenced to a specific level in a rock section on
During this era, oxygenic photosynthesis first evolved, releasing an abundance of oxygen, that first reacted with minerals and afterward was free to react with greenhouse gases of the atmosphere, leaving the Earth's surface free to radiate it energy to space. This is known as the oxygen catastrophe which was to happen later in the Paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, released by these oxygen producing photoautotrophs, which evolved earlier in the Neoarchean.
During this era, the supercontinent Kenorland formed at about .
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