Covered alley built between 2900 and 2500 BC.
The walls supporting the cover slabs are built of dry stone except for the western end of the monument closed by a vertical slab.
Access to the eastern end (was) closed by a small slab and an easily removable stone wedge.
The floor of the monument was paved with stones.
Archaeologists have discovered ceramic vases and flint blades from Touraine there.
A system of defensive walls rested on the cairn and barred the point.
A post hole presenting a structured blocking testifies to the existence of wooden constructions complementary to the stone walls.
The occupation is evidenced by the presence of many grain mills and large food vessels.