Arizonasaurus was an archosaur from the Middle Triassic.

The researchers began to suspect changes in geology was somehow related to the mass extinction of dinosaurs - called the Cretaceous-Paleogene, or K-Pg, mass extinction. They started to examine what ...

Rock layers deposited before and after the major dinosaur extinction event 65 million years ago are surprisingly different.

Around 66 million years ago, the reign of the dinosaurs came to a fiery end. An asteroid about 7 miles (12 kilometers) wide, flying at 27,000 mph (43,000 km/h), slammed directly into Earth. The impact ...

(CNN) — It’s a long-standing debate in paleontology: Were dinosaurs thriving when an asteroid hit Earth one fateful spring day 66 million years ago, or were they already on their way out, and the ...

Massive volcanic eruptions did not cause the extinction of dinosaurs, according to a new study. Volcanoes on the Indian peninsula have long been proposed as an alternative cause for the demise of the ...

LITTLE ROCK — All around us, cultural icons are going the way of the brontosaurus. The gas-guzzling SUV? A dinosaur. The music CD? A dinosaur. The employer-matched 401(k)? A dinosaur. The only thing ...

Warning: Spoilers for Uncanny X-Men #14!The dinosaurs have finally been given a canonical reason for their extinction in the Marvel Universe. Dinosaurs have always been an important staple of Marvel ...

Among today’s birds, the species most closely resembling their dinosaur ancestors are large, flightless ground-dwellers like ostriches, emus (pictured above), cassowaries, rheas, and kiwis. Some of ...

The reptiles had such an "immense" impact on the planet that their sudden exit led to wide-scale changes in landscapes - including the shape of rivers, say American scientists. Geologists have long ...