In other words, teeth are like the pennies of ancient human remains; they turn up everywhere.

Together, these tiny fossils represent an intriguing piece of physical evidence that supports the findings of genetic studies of ancient human ancestry.

The find hinges on the partial jawbone and teeth of what appears to be an ancient human.

But like other signs of ancient human habitation in this part of the world, they are infrequently seen or studied.

Interbreeding between our ancestors and other ancient human species was common until about 40,000 years ago, according to scientists.