In April 1929, workmen of the quarry located near the Aniene River discovered a human cranium that looked to be fossilized. The skull was immediately delivered to Sergio Sergi, who began a long series of studies on the fossil. The Saccopastore skull was labeled a mature female. It is almost completely intact and overall shows a high degree of mineralization, even though it is missing both of the zygomatic arches and the mandible. After being discovered, the skull had taken damage by the workmen within the quarry. This included a number of dental crowns being broken and lost, along with some other damage to the supraorbital area and two holes punctured into the frontal and parietal areas of the vault