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Sixty-six million years ago, the Cretaceous period ended. Dinosaurs disappeared, along with around 90% of all species on Earth. The patterns and causes of this extinction have been debated since palaeontology began. Was it a slow, inevitable decline, or did the end come quickly, driven by a sudden, unpredictable disaster? Georges Cuvier, working in the early 19th century, was one of the first palaeontologists. He believed that geological catastrophes, or “revolutions”, drove waves of sudden exti

Mediterranean seaOceans generalCharles darwinNicholasr longrichLuis alvarezUniversity of bathTethys seaMarine reptilesGeorges cuvierCretaceous periodAsteroid impactMarine ecosystemFossil species