An article published in the journal “Nature Geoscience” describes a research on the evolutionary radiation, in the sense of the quick diversification of new species, that happened in the Ordovician period, between 445-485 million years ago. Known as the Great Ordovician Biodiversification Event (GOBE), it led to a huge growth in the number of species and according to a team of researchers it was caused also by an 80% increase in oxygen levels in the air.