What time era what's the largest Extinction of species?

The largest extinction of species occurred during the Permian-Triassic period, approximately 252 million years ago. This event, known as the "Great Dying," is estimated to have wiped out about 90-96% of marine species and around 70% of terrestrial vertebrate species. Factors contributing to this mass extinction included volcanic eruptions, climate change, and ocean anoxia. It marked a significant turning point in Earth's biodiversity and set the stage for the rise of the dinosaurs in the subsequent Mesozoic era.