The history of research at Pech I extends back to virtually the beginning of the science of Paleolithic archaeology. Initially excavated early in the 19th century by Jouannet and later by the Abbé Audierne, "Pey de lAzé", as it was then spelled, was one of the sites described by Lartet and Christy in their seminal article entitled "Cavernes du Périgord" published in 1864. Sometime during the 19th century most of the archaeological material within the cave itself was removed by pothunters, but in 1909, Peyrony discovered near the wall in front of the mouth a cranium of a child between the ages of five and six. In 1929-30 Vaufrey excavated in the terrace outside of the entrance to the cave and identified the sequence as containing only Mousterian of Acheulian industry. Later, from 1948 until 1951, more excavations were carried out by F. Bordes in the same area. It is believed that the Pech I deposits date to the Würm II.