In the middle period, the earthenware slightly changed its shape, but a large kamekan (earthenware jar-coffin) for adult, which had the same basic characters as previous earthware, was established in northern Kyushu.
中期には北部九州各地で少しずつその形態を変えながらも基本的には同じ形質的特徴を共有する成人用大型甕棺が北部九州に定着する。