They are academically valued in that dotaku mainly excavated in Kinai region, dohoko mainly excavated in northern Kyushu, and doken with a style unique to Izumo district were discovered in one site and also in large numbers.
畿内を中心に出土する銅鐸、北九州を中心に出土する銅矛、出雲地方特有の形式をもつ銅剣が同一遺跡から、しかも大量に出土したという点で学術的価値が高い。