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
Oxygenic photosynthesis first evolved in this era and was accountable for the oxygen catastrophe which was to happen later in the Paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, produced by these oxygen producing photoautotrophs, which evolved earlier in the Neoarchean.
The supercontinent Kenorland formed during this period, about .
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