1. Context of the findings In connection with the extension of the Butte-au-Berger Activity Zone to Chilly-Mazarin, a search campaign was carried out in 2009 covering an area of approximately 600 m². The study window belongs to the south-west slope of the Longboyau plateau, the substrate of which is marked by a residual lamb of sand from the upper Stampien covered by a loessic coat of approximately 1 m thick (Figure 1). The works unveiled a set of silos comprising 51 individuals r...