Archaeological research on the formation process of gigantic tumuli in Kibi district, prehistoric Japan

古坟时代中期（公元5世纪），在日本本土建造了许多巨大的锁眼状土丘。这些土丘被认为是古代日本国家形成过程中社会的反映。在这项研究中，我们阐明了这些主要墓群的发展过程和历史背景，而不是关注本身，而是关注日本冈山县木壁地区周围的正常人墓葬和他们的定居点。

In the middle of Kofun era (5th century AD), a lot of gigantic tumuli with keyhole-shaped mound were built throughout mainland Japan. These burial mounds are considered to refrect the society in the process of state formation in ancient Japan. In this study, we elucidate the process of development and historical background of these chiefly tumuli focusing not on themselves but on surrounding burials of normal people and their settlements in Kibi district, Okayama prefecture, Japan.