None of the human skulls had jaw bones. There was one human jaw bone at the site, but it wasn't associated with any of the skulls.
The discovery of a burial containing 8,000-year-old battered human skulls, including two that still have pointed wooden stakes through them, has left archaeologists baffled, according to a new study from Sweden.
It's hard to make heads or tails of the finding: During the Stone Age, the grave would have sat at the bottom of a small lake, meaning that the skulls would have been placed underwater. Moreover, of the remains of at least 11 adults placed on top of the grave, only one had a jawbone, the researchers said.