“We found two skulls that still had wooden stakes sticking out of them through a whole at the base of the skull,” archeologist Fredrik Hallgren, head of excavation with the Stiftelsen Kulturmiljövård Mälardalen (‘Cultural Preservation Society of Mälardalen’) told The Local.
The skulls and other artifacts, including bones of wild animals, were recovered at the Kanaljorden excavation site in the town of Motala in central Sweden.
According to results from carbon-14 dating techniques, the skulls and other items are estimated to be about 8,000-years-old.
“As far as we know, this discovery is unique in the world. Nothing has been found like this that is so old,” said Hallgren.
The mounted skulls were found with the stakes inserted the full length from the base to the top of the skull.
In another case a temporal bone of one individual identified as a female was found placed inside the skull of another woman.