↑ Radiocarbon measures of carbonized material from pottery artifacts (uncalibrated): Fukui Cave 12500 +/-350 BP and 12500 +/-500 BP (Kamaki&Serizawa 1967), Kamikuroiwa rockshelter 12, 165 +/-350 years BP in Shikoku (Esaka et al. 1967), from "Prehistoric Japan", Keiji Imamura, tr.46
↑ "Jōmon population densities are among the highest recorded for a foraging population, although in some areas of the Pacific Coast of North America, comparable and even higher figures of population densities have been observed (Hassan, 1975)." The History and Geography of Human Genes tr.249, Cavalli-Sforza ISBN 0-691-08750-4.
↑ "The synthetic maps suggest a previously unsuspected center of expansion from the Sea of Japan but cannot indicate dates. This development could be tied to the Jōmon period, but one cannot entirely exclude the pre-Jōmon period and that it might be responsible for a migration to the Americas. A major source of food in those pre-agricultural times came from fishing, then as now, and this would have limited for ecological reasons the area of expansion to the coastline, perhaps that of the Sea of Japan, but also father along the Pacific Coast." The History and Geography of Human Genes tr.253, Cavalli-SforzaISBN 0-691-08750-4.
