Human activity may be triggering the greatest extinction event since the asteroid impact that wiped out the dinosaurs, ...

"The pace of change we’re seeing today is unlike anything we know of in the past 66 million years," said ecologist Jack ...

Arizonasaurus was an archosaur from the Middle Triassic.

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

For the first time, scientists have dated dinosaur eggs that lay buried in rock for millions of years, using a groundbreaking new ‘atomic clock for fossils’ method. During the Cretaceous period, Earth ...

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 ...

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 ...

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 ...

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 ...