Small fossil shells were recovered in sieved residues from three localities in streams around the village of Chaam. The composition of the fauna, containing several valves of Ervilia, does not match those of Neogene or Paleogene faunas from adjacent Belgium. It does not appear likely that the fossil shells have been introduced accidentally by man. We suspect the fauna to have derived from Quaternary fluvial deposits that incorporated (now-eroded) Neogene deposits in adjacent Vlaanderen (Belgium).