 Neoproterozoic oxygenation event

The Neoproterozoic Oxygenation Event (NOE) refers to a significant increase in atmospheric and oceanic oxygen levels that occurred during the Neoproterozoic Era, which spans from approximately 1,000 to 541 million years ago. This period is crucial in the context of Earth's history because it precedes the appearance of complex multicellular life forms during the Cambrian Explosion.