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Inaridai Kofun Group

稲荷台古墳群 (Japanese)
Inaridai Kofun No. 1 Kofun
Shown within Chiba Prefecture
Coordinates	35°30′12″N 140°7′26.3″E / 35.50333°N 140.123972°E / 35.50333; 140.123972
Type	Kofun

The Inaridai Kofun Group (稲荷台古墳群) is a Kofun cluster [ja] or a group of Kofun located in the Chiba Prefecture.^[1]

The cluster includes Inaridai Kofun No. 1 Kofun, which is the kofun the Inaridai Sword was taken from.^[2] Some of the earliest pottery in the Kantō region has been found in this Kofun, giving its name to the type.^[3]

Located on the west of the Bōsō Peninsula and just east of Tokyo, Inaridai is part of a concentration of early archaeological sites, which also includes Shakujii, in Tokyo's Nerima ward among others. Northeast of these locations are the later sites, categorized as Proto-Jomon. These Proto-Jomon sites are distinguished by pottery that predominantly features fiber or cord impressions.^[1]

In the Miura Peninsula, pottery has shell marks. In the Western Kanto Plain, pottery changed from fiber marks to cord marks. Inaridai is a key site in this change.^[1]

The Kofun cluster gives its name to Inaridai pottery, the oldest pottery type in the Kantō region.^[3]

The Inaridai No. 1 Kofun and the Inaridai Kofun group are found in the Kanto loam layer. This layer has both early Jomon pottery types like Inaridai, Haijima, and Tado I and other artifacts.^[3] It is also used as a categorization for figurines.^[4] and other implements.^[5][6]

In the Kanto valley of Japan, the Inaridai is some of the oldest pottery found. It has a special rolling marking on it. Experts aren't sure where this marking method came from. Wu^[who?] thinks it might have started as a useful feature before becoming just for decoration. The Inaridai pottery dates back to just after the start of the proto-Jomon period. This makes it important for studying early Japanese pottery.^[7]

• Proto-Jomon period
• Miura Peninsula
• Hashihaka Kofun
• Makimuku ruins
• Ukikunden
• Inariyama Kofun
• Furuichi Kofun Cluster