Whether or not the asteroid or comet that carved the Chicxulub crater caused the extinction of more than half the planet's species at the end of the Cretaceous ... impact or a bout of volcanism ...

Did a collision with a giant asteroid ... tiny beads, impact ejecta are common at or near the Cretaceous/Tertiary (KT) boundary, the geological layer that defines the dinosaur extinction.

Explain the possible causes of the Permo-Triassic extinction in ... biological effects of an asteroid or comet impact on the earth, and discuss how well the data from the Cretaceous-Tertiary boundary ...

A crater at the edge of the Yucatán peninsula in Mexico was created by a massive asteroid that hit Earth 66 million years ago At the end of the Cretaceous ... impact drove the dinosaur extinction ...

The asteroid impact 66 million years ago led not just to the extinction of dinosaurs ... with thick canopies - unlike those of the late Cretaceous Period The structure of tropical forests also ...

These rock layers date back to the boundary between the Cretaceous and Paleogene ... that a comet caused the extinction event. Instead, it confirms the asteroid's impact as the cause of the ...