Dinosaurs weren't in decline when an asteroid smashed into Earth and wiped them out, scientists say. Instead, the idea that dinosaur diversity was declining before the asteroid struck 66 million years ...

The earliest known ancestors of turtles appeared about 220–240 million years ago (in the late Triassic period), roughly the ...

When the big asteroid hit Mexico 66 million years ago, it set off wildfires, tsunamis and massive clouds of dust that darkened the skies, killed much of Earth’s plant life and triggered a chain of ...

Dinosaurs were a different branch of archosaurs that later evolved into birds. The specific ancestors of dinosaurs were small, fast, upright-walking reptiles called dinosauromorphs. These creatures ...

Scientists know dinosaurs ceased to exist at the end of the Cretaceous period, but the details surrounding their vanishing act are a bit fuzzy. Some computer models suggest that a volcano, not a ...

Rocks formed immediately before and after non-avian dinosaurs went extinct are strikingly different, and now, tens of millions of years later, scientists think they’ve identified the culprit—and it ...

A site in the San Juan Basin of northwestern New Mexico is providing a rare glimpse into the last days of the dinosaurs.Rocks and fossils at the Naashoibito Member site show an ecosystem that was ...

A student discovers the first dragonfly fossil from the age of the dinosaurs in Canada. Cordualadensa acorni lived 75 million ...