In the late 8th century, the diameter of 3 to 10 m formed around the 9th century, and the tomb group of about 0.3 to 1 m high, the excavated product shows the strong relationship with the crowded mound in the northern part of the Tohoku region.
This ruins is a burial mound group that remains only here in Hokkaido, and it is valuable as the only existing ruins showing the north limit of this kind of crowded mound, and the region of Hokkaido area and the rule control It is an important ruins to think about interaction with.