Occupation layers of the cave in use during marine isotopic stage 6 (186,000 to 127,000 years ago) were excavated during the 1970s[1] and may demonstrate construction abilities and other organisational skills by the inhabitants at the time.

Close to the mouth of the cave and along one wall were found Acheulean stone tools along with fragments of animal bone surrounding two circular charcoal concentrations which likely served as hearths.

This occupation area measures 11 by 3.5 m (36 by 11 ft) and was delimited by the cave wall on three sides and on the fourth by a sinuous line of large stones.

It is by no means certain that the stones were brought into the cave and placed by people however and natural processes or a reason for their placement not involving a structure may explain their presence.

The limited evidence from nearby sites where similar stone tools and other cultural material have been found close to concentrations of natural rocks is less compelling than at Le Lazaret.