Between 2000 and 2007, a series of preventive excavations was undertaken in an extensive quarry at the bottom of a peaty valley. Excavated rapidly, site VII at Warluis yielded Paleolithic and Mesolithic remains. The Mesolithic is documented by three concentrations of remains. Their position in the lower Warluis zone ensures a Preboreal or early Boreal age. Two are assigned to the initial Mesolithic on the basis of techno-typological criteria of the lithic industry. These are probably briefly occupied sites devoted to a limited number of activities. Significantly more recent, the third concentration is clearly dated from the end of the Preboreal. The remains are linked to a probable hearth where hazel wood, hazelnut shells and animal bones were burned. The interpretation is directed towards the bivouac of a family or a small group of hunters. This study is a contribution to a broader approach to the first 1,500 years of the Mesolithic at Warluis which is based on the numerous concentrations of remains found and excavated over the 40 hectares of the quarry.