01 / Hirajō Shell Mound (平城貝塚)
A mound of only oyster shells,another of only clam shells.
A settlement site with shell mounds, mainly of the late Jōmon period, at the tip of a terrace on the right bank of the Sōzu River (僧都川). The oyster mound held only oyster shells, and the clam mound north of it only clam shells. Pottery from the mixed-shell layer is called Hirajō-style and is regarded as a marker of the late period.
- National Historic Site (designated Oct. 11, 2024)
- Found in 1891 by Teraishi Masamichi; the extent is estimated at 170 m north-south and 88 m east-west
- Made up of 5 shell mounds, a storage pit, post holes and burial pits (prefectural board of education)
