Map showing the location of duckbill dinosaurs during the Late Cretaceous period. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!

You might know the Cretaceous Period for big animals such as Tyrannosaurus rex and Triceratops, or for being the end of the age of dinosaurs. But what was the world like in the millions of years ...

Despite previous research, Earth's long-gone mega-reptiles probably weren't dying off before an impact winter did them in for ...

During this period, oceans formed as land shifted and broke out of one big supercontinent into smaller ones. 3 min read Continents were on the move in the Cretaceous, busy remodeling the shape and ...

Explore the age of the dinosaurs. Discover what the prehistoric world was like and how it changed between when dinosaurs first appeared and the mass extinction at the end of the Cretaceous Period. Non ...

Triceratops was one of the most common dinosaurs at the end of the Cretaceous Period. Its most prominent features are on its head: two long brow horns, a nasal horn, and a bony frill. Its frill had no ...

The first Brachychampsa fossil was discovered in Montana's Hell Creek Formation—an ancient suite of rocks that was laid down near the end of the Cretaceous period. That individual animal lived ...

ULAANBAATAR: A previously unknown species of ancient mammal that lived alongside dinosaurs during the Cretaceous period, about 90 million years ago, has been recorded for the first time in Mongolia.

A set of five fossilised small dinosaur footprints from the Cretaceous period has been discovered in northwest China’s Gansu Province. It is believed to be among the smallest known dinosaur ...