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 ...

You might know the Cretaceous Period for big animals such as Tyrannosaurus rex and Triceratops, or for being the end of the age of dinosaurs. But what was the world like in the millions of years ...

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 ...

The Cretaceous, with its real one ... Coral reefs were wiped out. Snails, ammonites, sea lilies and sea urchins got through, somehow. Single-celled critters were affected, too.

"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 ...