Sometime between 5.5 and 5.6 million years ago, two shell crushers squared off in the languid currents of an ancient Florida ...

Ammonites Ammonites came in a range of shapes and sizes from the truck tyre sized Tropaum imperator to species the size of a ...

"I immediately thought of gar." ...

When dinosaur fossils surface at a site, it is often not possible to tell how many millions of years ago their bones were buried. While the different strata of sedimentary rock represent periods of ...

An examination of an aquatic, shrimplike creature that lived half a billion years ago offers insight into how arthropods with mandibles became so common. By Rebecca Dzombak About 70 percent of the ...

An ancient reptile once thought to be an early turtle ancestor actually belonged to an entirely different group.