The team tackled the problem by dating the wider geological context of the river system and the bone bed where the skulls were found, which sits some 20 meters above the current river thanks to thousands of years of erosion.
Because the bones were excavated nearly a century ago, it has been difficult to date them. The team tackled the problem by dating the wider geological context of the river system and the bone bed where the skulls were found, which sits some 20 meters above the current river thanks to thousands of years of erosion.