The prehistoric facial bones were found buried in 50 feet of mud and silt, and are believed to be 1.1 to 1.4 million years old, researchers said.

Researchers in Spain have discovered pieces of a fossilized face belonging to an ancient human ancestor. The fragments cannot be conclusively identified as any particular species.

The upper jawbone and partial cheek bone represent a mysterious unknown species that lived in present-day Spain between 1.1 million and 1.4 million years ago, according to a new study