Tyrannosaurus Rex Tyrannosaurus rex arose during the Cretaceous period about 85 million years ago, and thrived as a top land ...

Early ammonites had simple suture lines traced across their shells, while the sutures on species from the Cretaceous period (145 to 66 million years ago) formed intricate patterns that may have ...

Opalized ammonite fossils are some of the most unique and spectacular paleontological specimens. They were formed through a ...

These animals are known from the Jurassic Period, from about 200 million years ago. Most ammonites died out at the same time as the non-avian dinosaurs, at the end of the Cretaceous Period, 66 million ...

Exquisitely preserved fossils of a shark that thrived during the Cretaceous period appear to ... such as large ammonites and sea turtles.” While the individuals they studied are small, at ...

"From ammonites to bivalves, these ancient marine creatures reveal secrets from the Lower Cretaceous Period." Despite the boreholes being 102mm (four inches) in diameter, a few intact and well ...