Sekizoku, which was easy to penetrate deeper, suddenly appeared in the Kinki region during the Yayoi period as upland settlements were built and many of such Sekizoku have been unearthed.
それが突如として弥生中期に、深く突き刺さりやすい形の石鏃が高地性集落の出現とともに近畿地方に出現し、大量に出土している。