Self-proclaimed "fossil geek" Peter Bennicke was recently searching a beach at the Cliffs of Stevns in eastern Denmark when he came across a strange fossil in a large piece of chalk. He took the fragment to a museum,

A cluster of 66-million-year-old fish vomit is a natural, national treasure in Denmark. The rare find shines a light on the sea animals of the Cretaceous period.

"This type of discovery is considered very important for reconstructing past ecosystems because it provides important information on which animal was eaten by whom."

In the Cretaceous period, a shark or another kind of fish found sea lilies less than digestible. What you might expect followed.

A 66-million-year-old fossilized vomit discovery in Denmark offers a rare glimpse into the prehistoric Cretaceous food chain.

Sixty-six million years ago, a marine creature, minding its own business at the bottom of a Cretaceous sea, munched on some sea lilies—then didn’t feel too great. Now, a fossil hunter in Denmark named Peter Bennicke has found the remains of this Cretaceous snack: fossilized vomit.