The Cretaceous-Tertiary (K/T) mass extinction that wiped out dinosaurs 65.5 million years ago is the last of five major biological crises that occurred in the history of life on Earth.

Each of them and the subsequent evolution of new life forms profoundly altered the planet up to the current expansion of the human species throughout the planet.

After proposing that the extinction of the K/T could be due to a bolide impact, the search of its impact crater began. Its discovery in Yucatan led scientists to direct their attention to Mexico in search of evidence. But what they found questioned that the impact would coincide in time with the K/T or caused any extinction.

In four of the five major mass extinctions, major volcanic episodes have taken place, including the K/T mass extinction. Thus, as it was becoming evident that the Chicxulub impact did not cause the demise of the dinosaurs, some scientists have investigated the massive Deccan volcanism in India as a possible cause of the K/T mass extinction.

Currently, there is a large database that suggests that the last great biological extinction could have been caused by our planet�s own geological dynamics.