Permian-Triassic Boundary: The Great Dying | Estateplanning

The Permian-Triassic (P-Tr) boundary marks a pivotal moment in Earth's history, defined by the most severe mass extinction event known, colloquially termed the 'Great Dying.' Occurring approximately 251.9 million years ago, this boundary signifies the transition from the Paleozoic Era to the Mesozoic Era and resulted in the loss of an estimated 90% of Earth's species.