The changing remains

Within the historic site, surveys thus far have found 12 circular stone arrangements, 5 square stone arrangements, 9 stone-row arrangements, 12 standing-stone arrangements, 99 stone arrangements, 91 dug-standing pillar buildings, 7 pit dwellings, 275 flask-shaped pits (storage holes), 476 pits, 60 T pits (pitfalls), and many other arrangements. Each type of arrangement has its own ideal location in terms of wind direction, sun exposure, and drainage, so that people could choose the best places and build the arrangements, sometimes developing the land for this purpose. These arrangements were built in the early and middle parts of the late Jōmon period (approx. 4,000–3,500 years ago) and may be categorized into five periods.