This wasn't the first mass extinction in our planet's history ... also known as the K-T extinction) left an indelible mark on ...

Some biologists conclude that humans owe our present dominance to a mass extinction -- the K/T event that saw the end of the dinosaurs and cleared the way for mammals to diversify into all the ...

Scientists have discovered levels of iridium 30 times greater than average in the Cretaceous/Tertiary (KT) boundary, the layer of sedimentary rock laid down at the time of the dinosaur extinction.

A new study reveals that Earth's biomes changed dramatically in the wake of mass volcanic eruptions 252 million years ago.

A new study reveals that a region in China's Turpan-Hami Basin served as a refugium, or "life oasis," for terrestrial plants ...

We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.

This story appears in the October 2019 issue of National Geographic magazine. Some scientists contend that we’re heading toward what would be the sixth mass extinction in the history of life on ...