Scientists have explored how changes in sea surface temperatures during the Cretaceous influenced the diversification and ...

Exquisitely preserved fossils of a shark that thrived during the Cretaceous period appear to solve a long-standing mystery around how it hunted and where it fits into the shark evolutionary tree.

At the beginning of the Cretaceous Period (145 million to 66 million years ago) sharks were once again widely common and varied in the ancient seas, before experiencing their fifth mass extinction ...

Long before the carnage began, the Cretaceous picked up where the Jurassic ... snakelike mosasaurs. Rays and modern sharks became common. Sea urchins and sea stars (starfish) thrived; coral ...

"You never know unless you look," said Jayson Kowinsky, a high school physics teacher from Pittsburgh who, while sifting ...

Cretoxyrhina was one of the largest sharks and a formidable predator in the Late Cretaceous seas. Nicknamed the Ginsu shark after the kitchen knife that slices and dices, Cretoxyrhina ripped apart ...