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 ...

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 ...

Long before the carnage began, the Cretaceous picked up where the Jurassic ... long-necked and toothy marine reptiles terrorized fish, ammonites, and mollusks in the seas; pterosaurs and hairy ...

A 444 million-year-old fossil was discovered in a gravel pit Steele County and is now at Mayville State University.

Earth’s long history has seen an uncountable number of species come and go – but one of the most famous extinction events we ...