archean/proterozoic barrier.
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The Great Oxidation Event (GOE), also known as the Great Oxidation or the Oxygenation Event, refers to a significant increase in Earth's atmospheric oxygen levels that occurred approximately 2.4 billion years ago, during the Paleoproterozoic Era. This event marked a major turning point in Earth's history and is associated with the emergence of oxygen-producing photosynthetic organisms, primarily cyanobacteria.