No great extinction or burst of diversity separates the Cretaceous from the Jurassic.

This would certainly have made the world's climate much worse, and is now thought to be the main cause of this great extinction.

A great extinction, especially of mammals, continued throughout the end of the Pleistocene, and may be continuing today.

The program features palaeontologists and other scientists as they try to find clues to the great extinction.

Welcome to the age of the 6th great extinction.

In the eons since living cells first banded together to form worms, Earth has suffered five great extinctions.

That was one of five great extinctions revealed in the fossil record.

Q. Some biologists believe we are in the midst of great extinction right now.

A. I think we are going through what is sometimes called the sixth great extinction.

Species are being snuffed out at rates rivaling the great extinctions of geologic history.