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Period of human inhabitation in Japan predating the development of pottery

The Japanese Paleolithic period (旧石器時代) is the period of human inhabitation in Japan predating the development of pottery, generally before 10,000 BC. The starting dates commonly given to this period are from around 40,000 BC; although any date of human presence before 35,000 BC is controversial, with artifacts supporting a pre 35,000 BC human presence on the archipelago being of questionable authenticity. The period extended to the beginning of the Mesolithic Jōmon period, or around 14,000 BC. The earliest human bones were discovered in the city of Hamamatsu in Shizuoka Prefecture, which were determined by radiocarbon dating to date to around 18,000–14,000 years ago.

The study of the Paleolithic period in Japan did not begin until quite recently: the first Paleolithic site was not discovered until 1946, right after the end of World War II. although older ground stone tools have been discovered in Australia. The tools, which have been dated to around 30,000 BC, are a technology associated in the rest of the world with the beginning of the Neolithic around 10,000 BC. It is not known why such tools were created so early in Japan. 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 BC. During much of this period, Japan was connected to the Asian continent by land bridges due to lower sea levels. According to “Jōmon culture and the peopling of the Japanese archipelago” by Schmidt and Seguchi, the prehistoric Jōmon people descended from a paleolithic populations of Siberia (in the area of the Altai Mountains). Other cited scholars point out similarities between the Jōmon and various paleolithic and Bronze Age Siberians. There were likely multiple migrations into ancient Japan. According to Mitsuru Sakitani, the Jōmon people were an admixture of two distinct ethnic groups: A more ancient group (carriers of Y chromosome D1a) that were present in Japan since more than 30,000 years ago and a more recent group (carriers of Y chromosome C1a) that migrated to Japan about 13,000 years ago (Jomon). 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 modern Japanese have about 10% Jōmon ancestry. Jōmon people were found to have been very heterogeneous. Jōmon samples from the Ōdai Yamamoto I Site differ from Jōmon samples of Hokkaido and geographically close eastern Honshu. Ōdai Yamamoto Jōmon were found to have C1a1 and are genetically close to ancient and modern Northeast Asian groups but noteworthy different to other Jōmon samples such as Ikawazu or Urawa Jōmon. Similarly, the Nagano Jōmon from the Yugora cave site are closely related to contemporary East Asians but genetically different from the Ainu people, who are direct descendants of the Hokkaido Jōmon. One study, published in the Cambridge University Press in 2020, suggests that the Jōmon people were rather heterogeneous, and that many Jōmon groups were descended from an ancient "Altaic like" population (close to modern Tungusic speakers, represented by Oroqen), which established itself over the local hunter gatherers. This “Altaic like” population migrated from Northeast Asia in about 6,000 BC, and coexisted with other unrelated tribes and or intermixed with them, before being replaced by the later Yayoi people. C1a1 and C2 are linked to the "Tungusic like people", which arrived in the Jōmon period archipelago from Northeast Asia in about 6,000 BC and introduced the Incipient Jōmon culture, typified by early ceramic cultures such as the Ōdai Yamamoto I Site. Another study, published in Nature in 2021, combined linguistic, archaeological, and genetic evidence to suggest that the Transeurasian, or "Altaic", population, originated in the West Liao basin of northeastern China, and farmed millet. The study concluded that this population spread through Korea to Japan, bringing their agricultural practices, and triggering a genetic shift from the Jōmon to the Yayoi people, as well as a shift to the Japonic language.