A molar of a deer was recovered in situ by a scuba diver from a fossil site near Langenboom (The Netherlands). The molar, here identified as Cervus rhenanus Dubois, 1904, stems from the Oosterhout Formation, from an interval that is dated to the middle to late Zanclean (Early Pliocene), considerably extending the stratigraphic range of the species. The recovery of this molar suggests fossil terrestrial mammals found ex-situ from the Langenboom may originate from these Early Pliocene layers as well.