The Yokonagane A sites date from the middle of the Yayoi period (about 2400 years ago). Excavations have revealed the ruins of a pit house, as well as pottery and stone tools, and carbonized rice. In addition, there were traces of rice plants found in the earthenware. It is currently a residential area, but the ground is sandy soil. It is thought that people of this time lived and grew rice on the sand dunes that rise up above the surrounding area. Like the Shidonosawa site on the coast of Hachirogata Lagoon, this site is crucial to learning about the beginning of rice farming in Akita Prefecture.