It is a material centered on wood products that were excavated from the Lowland of Mizawa River.
It is mainly excavated from the early-stage peat layers between the first half of the first half of the barrel B volcanis (1667) and the barrel A volcanic ash (1739), and it adds the relics of the abrasion era. A variety of huntings such as ships of a ship of Mekajiki sculptures, a hunting tool such as a geometric pattern, and a haunting instrument, and an ingredient containing lacquerware.