“…It is generally agreed, based on cranial and dental morphology, that Jomon period populations are direct ancestors of the Hokkaido Ainu (e.g. Howells, 1966;Turner, 1976;Brace and Nagai, 1982;Yamaguchi, 1982;Hanihara, 1985Hanihara, , 1991Dodo, 1986;Mouri, 1986;Matsumura, 1989Matsumura, , 1994Matsumura, , 1995aDodo and Ishida, 1990;Pietrusewsky, 1994Pietrusewsky, , 2004Ossenberg et al, 2006). Geographical variation in Jomon period material has been investigated by several researchers and only minor differences have been found in the cranial morphology of samples dating from the middle to final Jomon periods (ca.…”