Abstract
Buried trees in the Ubuka Basin, southwestern Japan, were investigated to identify the wood species and to build tree-ring chronologies. A total of 65 trees were collected belonging to three species: Japanese cedar (Cryptomeria japonica, 63 trees), Japanese nutmeg tree (Torreya nucifera, one tree) and Hinoki cypress (Chamaecyparis obtusa, one tree). Crossdating of the individual ring-width series resulted in four independent tree-ring chronologies covering 605, 576, 507 and 395 years. The absolute ages of these chronologies were determined to be 3676, 4166, 4576 and 4876 cal BP by definite-gap sequence modeling of radiocarbon dates measured at a constant gap of 30 years. An extremely long, continuous chronology can probably be developed in the future by increasing the number of samples at this site.
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