From 2000 till 2005, large-scale rescue excavations were realized on an extensive Late Palaeolithic and Early Mesolithic settlement situated on the flood-plain of the Thérain, a tributary of the river Oise. Warluis VI and IX are two sectors with a number of artefact loci. They are separated from the other sectors by a large empty space.

Intercalated between a boreal peat and a layer of gravels lies an organic fluvial loam which contains the artefacts. Its lower part is attributed to the Allerød and its upper part is dated to the Preboreal and the beginning of the Boreal. The deposits of the later Dryas are lacking. Some relics of the late Palaeolithic occupation levels are sometimes preserved in the lower part. Bones and Mesolithic flints are generally scattered in the upper part.

Warluis VI and IX are different from many others sectors of Warluis. The size of the units is small and the activities are restricted. Three loci are attributed to the Late Palaeolithic: a zone of acquisition of raw material (VIb), a locus with only some flint tools (IXc) and a fireplace near a tree-fall feature without lithic material (IXb). The two Mesolithic units (VIa and IXa) are two areas for flint knapping with chips, flakes, bladelets, etc.

These five units are, maybe, short-lived stopping places connected to a residential site several kilometres away. They can also reflect activities practised in a very large peripheral area of the main units of Warluis.