The mammalian faunas of Pakefield/Kessingland and Corton, Suffolk, UK: evidence for a new temperate episode in the British early Middle Pleistocene

Abstract

It has been recognised for some time that early Middle Pleistocene mammal faunas in Britain can be divided into an earlier group with Mimomys savini (e.g. West Runton Freshwater Bed—WRFB), and a later group with Arvicola terrestris cantiana (Boxgrove, Westbury, Ostend), representing two or more temperate/interglacial stages. On the basis of the available early Middle Pleistocene non-marine molluscan faunas, Meijer and Preece (in: C. Turner (Ed.), The Early Middle Pleistocene in Europe, Balkema: Rotterdam, 1996, pp. 53–82.) and Preece (Quaternary Science Reviews 20 (2001)) recognised three biostratigraphic groups, representing at least three temperate stages. These are largely compatible with the vertebrate faunas, but new evidence presented here strongly indicates that Pakefield/Kessingland represents an additional, hitherto unrecognised temperate stage with Mimomys savini, younger than the WRFB but older than Little Oakley, Boxgrove and Westbury.New exposures and finds from the Cromer Forest-bed Formation at Pakefield, Suffolk have prompted a fresh look at the palaeontology of Pakefield/Kessingland and also Corton, which has a similar lithostratigraphic and biostratigraphic sequence. The large-mammal fauna (at least in part pollen substage II) includes Hippopotamus sp., Palaeoloxodon antiquus, and Megaloceros dawkinsi—none of which has so far been found in the WRFB—strongly suggesting that the Suffolk sites represent a distinct stage. Further, no records of ‘southern’ European plant, invertebrate or vertebrate taxa have been found in the WRFB, whereas the plants Trapa natans and Salvinia natans—indicating summers warmer than now—are known from Pakefield/Kessingland and Corton, providing corroborative evidence for a stage distinct from the Cromerian s. s.