Abstract
The Y-shaped lumbers of chestnut trees from the Jomon period about 4000 years ago were excavated at the Sakuramachi site in Oyabe City, Toyama, Japan in 1997. The usage of Y-shaped lumbers at this site has not yet been clarified. A field survey of the Y-shaped lumbers of the Sakuramachi site was performed and structural characteristics of the Y-shaped lumbers were investigated. According to these characteristics, the hypothesis that they could have been used as sledges has been proposed. In 1988, giant chestnut trees were excavated at the Sakuramachi site in Oyabe City, Toyama, Japan. In 1994, giant chestnut trees were excavated at the Sannai-Maruyama site in Aomori City, Aomori, Japan. It is thought that the people from the Jomon period about 4000 years ago used the Y-shaped lumbers to transport heavy items such as giant trees. Giant trees excavated at both the Sakuramachi and Sannai-Maruyama sites are discussed in this paper.
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