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

The new dinosaur, named Joaquinraptor casali, was about 23 feet (7 meters) long and weighed over 2,200 pounds.

Scientists in Argentina have unearthed a new dinosaur species, Joaquinraptor casali, believed to be a more powerful predator than the Tyrannosaurus.

In a fossil bed dating back 68 million years, scientists discovered the remains of a new species of megaraptor — a lithe, ...

Large aquatic lizards once populated the Earth’s oceans—and you can find their fossils in suburban New Jersey.

Speedy megaraptor Joaquinraptor casali had big arms and claws like hedge trimmers that would have made T. rex's forelimbs look puny.

Scientists announced Tuesday the discovery of a new dinosaur in Patagonia, Argentina, with a crocodile bone in its jaw.

Around 66 million years ago, the reign of the dinosaurs came to a fiery end. An asteroid about 7 miles (12 kilometers) wide, ...

Uncover the story of this pivotal moment. Live. Join us for a day of journalism, investigating what comes next for our rapidly warming planet. How will the Trump administration’s policies affect ...