Photographed in July 1964
An excavation survey of Earthwork Burial Circle No. 1 was conducted in July 1964 to investigate five pit graves in an excavation area of approximately 67 m2 and to confirm the construction method of the earthwork. The investigation revealed that the earthwork burial circle had been constructed in the Jomon period.

photo courtesy: Chitose Archaeological Operations Center, Chitose Board of Education, Chitose City