Mosasaur evolution represents one of the most striking examples of evolutionary innovation among marine reptiles. Emerging in the mid-Cretaceous, these marine squamates rapidly diversified to occupy a ...

A team of researchers has identified a new species of mosasaur, an extinct aquatic reptile that dominated the oceans during the late Cretaceous period. This discovery, named Jormungander walhallaensi ...

The Western Interior Seaway, which existed roughly 80 million years ago, split North America into North and South. It was a warm, shallow sea teeming with life from the Arctic Ocean to the Gulf of ...