Toward the end of the Cretaceous period, many species of marine organisms became extinct. Land dinosaurs completely disappeared, along with flying reptiles, sea reptiles, and ichthyosaurs. Other land reptiles were little affected. Most species of...

The K-T event (Cretaceous-Tertiary event) refers to the mass extinction of the dinosaurs that took place approximately 65 million years ago (mya). In addition to the dinosaurs, most large land animals perished and an estimated 70% of all species on the...

The Cretaceous–Tertiary extinction event[1] was the large-scale mass extinction of animal and plant species in a geologically short period of time, approximately 65.5 million years ago (mya). It is widely known as the K–T extinction event and...

Heat wave at the K-T boundary? The widespread death of microscopic ocean plants 65 million years ago could have triggered an extreme global heat wave that helped kill off roughly half the existing species of plants and animals, including the dinosaurs, at...

K-T mass extinctions: Abrupt or what? A small, barren island off the coast of Antarctica is revealing a surprising and remarkably detailed picture of the mass extinctions at the end of the Cretaceous period. These new findings, far different from the record...