International audienceA preventive excavation prior to the extension of a quarry revealed a Mesolithic concentration in the valleyof the Thérain. This wide alluvial plain was at that time a mixture of gravel mounds, channels and peat bogs.The Prehistoric site was situated close to a channel about sixty metres from a steep chalk bank.The finds are few, but they include some well-preserved animal remains from roe deer and aurochs, and alithic industry restricted to products of full debitage and to microburins.The surface of the excavation however is too limited to justify any decision between the hypothesesconcerning the function of the site. It may have been a specific working area connected with a dwelling, or aplace used for butchery and t...