Middle Pleistocene handaxes from the Korean Peninsula.

We present four biface assemblages from an archaeologically poorly known region of the Old World: Middle Pleistocene Korea. The handaxes are derived from a series of Middle Pleistocene localities in the Imjin/Hantan River Basins (IHRB) in Korea. The best known of these localities is Chongokni, although a number of equally important sites in the IHRB have been discovered and excavated over the course of the past two decades (e.g., Kumpari, Chuwoli, and Kawoli). Reanalysis of the age of the Chongokni deposits suggests a hominin occupation between 350-300 ka. Comparative study of the IHRB handaxes with the well-known bifacial implements from Olorgesailie (Kenya) and Hunsgi-Baichbal (India) indicates that the often-noted "thick" trait of the East Asian handaxes differs at a statistical level across the various regions of the Old World. The finds from the IHRB sites, and the Chinese sites of Bose and Dingcun that contain handaxes-like implement, question the validity of the Movius Line sensu stricto. However, why East Asian Middle Pleistocene hominins did not consistently produce more refined bifaces across broader regional and/or temporal facies, remains open to question. Thus, the absence of similar sites in wider areas of Early and Middle Pleistocene East Asia suggests that the Movius Line sensu lato is still supportable and warrants additional detailed cross comparative studies of the stone toolkits east and west of the line.