A mass extinction is a global event in which a large number of species perish in a relatively short amount of geologic time. There have been five major mass extinctions in Earth’s history. The Cretaceous-Palaeogene extinction event was the fifth and most recent. Following the Triassic-Jurassic extinction, dinosaurs were the most successful survivors on land, … Continue reading The Cretaceous-Palaeogene Extinction Event