Many scientists believe that the collision of a large asteroid or comet nucleus with Earth triggered the mass extinction of the dinosaurs and many other species near the end of the Cretaceous Period.
At the end of the Cretaceous Period, 65 million years ago, an asteroid hit Earth in the Yucatan Peninsula, Mexico, forming what is today called the Chicxulub impact crater.
66 million years agoCretaceous–Paleogene extinction event / OccurredMass extinction at the end of the Cretaceous Period (66 million years ago) Best known for killing off the dinosaurs, the end-Cretaceous mass extinction also caused many other casualties.
Mass the size of Mount Everest that hit Earth at North America, killing all North American large mammals in what was known as the late Cretaceous Mass Extinction event.