How long ago did the Permian Triassic event occurs?

The Permian-Triassic extinction event, often referred to as "The Great Dying," occurred approximately 252 million years ago. It marks the boundary between the Permian and Triassic geological periods and is considered the most severe extinction event in Earth's history, leading to the loss of about 90% of marine species and 70% of terrestrial vertebrate species. This event had profound effects on the planet's biodiversity and ecosystems, shaping the course of life on Earth for millions of years thereafter.