Fossils

About 470 million years ago, 7-foot-long arthropods ruled the water in what is now Morocco.

Thanks to soft-tissue preservation, we now know what Tuzoia, a Cambrian arthropod first discovered 100 years ago, actually looked like.

Warped amphibian-like fossils in Ireland were likely transformed by superheated fluids that were released as ancient continents crashed into one another around 300 million years ago.

About 90% of all species went extinct during the "Great Dying" around 252 million years ago, but in the case of one paleo-beast — the so-called gorgon — reports of its death were greatly exaggerated, new research finds.

Fangy Whatcheeria measured up to 6.5 feet (2 meters) long, and more than 300 million years ago, it was the apex predator in the sinkholes-turned-lakes of the American Midwest.

An ancient worm unearthed in China has one of the oldest fossilized brains ever found. The brain's shape could also help solve a centuries-old debate about the evolution of arthropods.

Paleontologists have discovered fossils belonging to a newfound species of tyrannosaur, which could fill an important gap in the evolutionary history of T. rex.

Scientists recently unearthed fossils of strange ocean creatures that lived about 460 million years ago and were unlike any animal alive today.

Researchers in Spain have unearthed a never-before-seen species of ancient marine turtle, the largest of its kind ever uncovered in Europe.

Extremely detailed Cambrian fossils show that enigmatic skeleton tubes belonged to ancient ancestors of modern jellyfish.