At the 76th Tomb, one of the round tumulus and a horizontal cave tombs which were known since ancient times to be existing on the Kiyotosaku Hills, excavation researches were conducted in November 1967, using the opportunity of a site preparation work for a new school building of the Futaba Municipal Minami Elementary School.
古くから清戸迫丘陵地にその存在が知られていた円墳・横穴群のうちの76号で、1967年（昭和42年）11月、双葉町立南小学校の新築に伴う敷地造成工事にかかる発掘調査がおこなわれた。