Also the possibility that the adaptation of rice-paddy cultivation in parts of northern Kyushu that go back to the first half of the last of Jomon period is indicated, but clear evidence of ancient structural remnants have not yet been discovered and is still speculation.
また、水稲農耕の導入についても北部九州の一部地域では縄文晩期前半にまでさかのぼる可能性が指摘されているが、明確な遺構が発見されておらず、推測の域を出ない。