The JAPANESE PALEOLITHIC PERIOD (旧石器時代, _kyūsekki jidai_) is the period of human inhabitation in Japan that lasted from around 40,000 BCE to 14,000 BCE, which corresponds to the beginning of the Mesolithic Jōmon period . The 35,000 BCE date is most generally accepted: Any date of human presence before 35,000 BCE is controversial, with artifacts supporting a pre-35,000 BCE human presence on the archipelago being of questionable authenticity.
GROUND STONE AND POLISHED TOOLS
The Japanese Paleolithic is also unique in that it incorporates the earliest known ground stone tools and polished stone tools in the world, dated to around 30,000 BCE, a technology typically associated with the beginning of the Neolithic , around 10,000 BCE, in the rest of the world. It is not known why such tools were created so early in Japan, although the period is associated with a warmer climate worldwide (30,000–20,000 before present), and the islands may have particularly benefited from it.
Because of this originality, the Japanese Paleolithic period in Japan does not exactly match the traditional definition of Paleolithic based on stone technology (chipped stone tools). Japanese Paleolithic tool implements thus display Mesolithic and Neolithic traits as early as 30,000 BCE.
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The Paleolithic populations of Japan, as well as the later Jōmon populations, appear to relate to an ancient Paleo-Asian group which occupied large parts of Asia before the expansion of the populations characteristic of today's people of China , Korea , and Japan .
Skeletal characteristics point to many similarities with other aboriginal people of the Asian continent. Dental structures belong to the Sundadont group, mainly distributed in ancient populations of South-East Asia (where current populations belong to a mixture of Sunadont and Sinodont groups). Skull features tend to be stronger, with comparatively recessed eyes.
The aboriginal populations of the Ainu , today mostly confined to the northern island of Hokkaidō , and the Ryukyuan people , mostly in southern Japan, appear to be the descendants of these Paleolithic populations, and display features that have, in the past, been interpreted as Caucasoid , but today tend to be considered more generally as part of that early Paleolithic human stock and are genetically closer to Southeast Asians.
Genetic analysis on today's populations is not clear-cut and tends to indicate a fair amount of genetic intermixing between the earliest populations of Japan and later arrivals (Cavalli-Sforza ). It is estimated that 10 to 20% of the genetic capital of the Japanese population( Yamato people ) today derives from the aboriginal Paleolithic-Jōmon ancestry, with the remainder coming from later migrations from the continent, especially during the Yayoi period .
ARCHAEOLOGY OF THE PALEOLITHIC PERIOD
The study of the Paleolithic period in Japan was not begun until quite recently: the first Paleolithic site was discovered right after the end of World War II . Due to the previous assumption that humans did not live in Japan before the Jōmon period , excavations usually stopped at the beginning of the Jōmon stratum (14,000 BC), and were not carried on further. However, since that first Paleolithic find by Tadahiro Aizawa , around 5,000 Paleolithic sites have been discovered, some of them at existing Jōmon archaeological sites.
The study of the Japanese Paleolithic period is characterized by a high level of stratigraphic information due to the volcanic nature of the archipelago: large eruptions tend to cover the islands with levels of ash , which are easily datable and can be found throughout the country as a reference. A very important such layer is the AT (Aira - Tanzawa ) pumice , which covered all Japan around 21,000–22,00