The six-mile-wide asteroid punched a one-way ticket toward extinction for all non-avian dinosaurs. Some 66 million years ...

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

Over 70 million years ago, during the late Cretaceous period, the southeastern U.S. was a warm, subtropical region covered by a vast shallow sea known as the Western Interior Seaway. Much of the ...

According to some scientists, fossil evidence clearly shows a decline in the number of dinosaur species for several million years leading up to the end of the Cretaceous. Sea Level The presence of ...

For most of the Cretaceous, Canada’s prairie provinces were sitting deep underwater. A giant inland sea cut right across North America. Known as the Western Interior Seaway, it ran north to ...

These fragments turned out to be fossilized remains of sea lilies—marine creatures that thrived during the Cretaceous period. Paleontologist Jesper Milàn expressed his excitement over the ...

A Danish fossil hunter discovered a 66-million-year-old chunk of fossilised vomit, likely from a fish that couldn't digest sea lilies.