Suriusuyama Kofun

Suriusuyama Kofun is a keyhole-shaped burial mound at 生野町 in 善通寺市, 香川県, Japan. It stands on a ridge extending southwest from 磨臼山, overlooking the alluvial plain of 土器川. The mound forms part of 有岡古墳群, a group designated as a National Historic Site, and its excavated split-bamboo-style stone coffin is designated an Important Cultural Property of the nation.

The mound measures 49.2 meters in length. Its round rear section is about 42 meters across and 3.5 meters high; the square front is 26.4 meters long, 10.8 meters wide and 1.75 meters high, with the neck also 10.8 meters wide. Stone facing and haniwa clay figures are present on the surface, but no surrounding ditch has been detected. The front of the mound faces west.

A cut-and-hollowed split-bamboo-style stone coffin lies in the centre of the round rear section, set on river stones with its axis parallel to that of the mound. Its lid measures 2.3 meters long, 0.65-0.77 meters wide and 0.36-0.40 meters high; the coffin body measures 2.37 meters long, 0.79 meters wide and 0.35-0.43 meters high. A stone pillow, engraved comma-shaped ear ornaments and traces of red pigment survive inside. The coffin is made of 角閃石安山岩 from 鷲ノ山, and the excavated coffin was designated an Important Cultural Property in 1993.

The mound has been robbed twice, during the 寛政年間 (1789-1801年) and 天保年間 (1831-1845年), and the coffin was dug out in 1956. No full archaeological excavation has been carried out, so grave goods remain poorly known because of the earlier looting. Its construction is estimated at the latter half of the 4th century, within the early Kofun period. The mound area became a National Historic Site in 1984 as part of 有岡古墳群.

Suriusuyama Kofun is a megalithic mound (tumulus with integral stones) in Zentsūji-shi, Japan. Wikidata describes it as: kofun in Zentsūji, Kagawa, Japan. A typological estimate: 250 CE to 650 CE. No English Wikipedia article exists for it; the full text below is the Japanese article "磨臼山古墳", shown in the original language.