By the way, it was known that Totsuki-style cylindrical Haniwa, which are the oldest Haniwa, and Sankakubuchi Shinjukyo Mirror (triangular-rimmed mirror) made in continent, which are thought to be the oldest burial goods of large keyhole-shaped tomb mound, were not found in the same tomb, that is, when the former were unearthed from a tomb, the latter were not found there, and vice versa.
ところで、最古の埴輪である都月形円筒埴輪と最古の前方後円墳の副葬品とされる大陸製の三角縁神獣鏡とが、同じ墓から出土しないで、前者が出ると後者が出ないし、その反対もあることが知られていた。