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.

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,

The scientific term for fossilized vomit is regurgitalite. Surprisingly, the timeless throw up is far from the oldest out there — Dr. Milàn said that Germany, for example, has laid claim to an even more historic spot of spit up, dating back 150 million years.