Onset of Great Oxidation Event

Isotopic dating of the Ongeluk large igneous province in southern Africa revealed that the first Paleoproterozoic global glaciation and the beginning of significant atmospheric oxygenation likely occurred between 2,460 and 2,426 million years ago, approximately 100 million years earlier than previous estimates, and that the rise of atmospheric oxygen was not gradual but characterized by significant oscillations and associated climatic instabilities before irreversible oxygenation of the atmosphere around 2,250 million years ago. - Read at PNAS.org

Article #16-08824: “Timing and tempo of the Great Oxidation Event,” by Ashley P. Gumsley et al.