<Preliminary>The Use of Tree Species for Wooden Artifacts Excavated from the Relics around Lake Biwa

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Radiocarbon Analysis of Tree Rings from a 15.5-Cal kyr BP Pyroclastically Buried Forest: A Pilot Study

From the 19th International Radiocarbon Conference held in Keble College, Oxford, England, April 3-7, 2006.We have determined the radiocarbon ages for 40-yr-interval tree rings in 2 fossil trees of the Towada Hachinohe buried forest, northeastern Honshu Island, Japan. The 14C ages range from 13.0 to 13.3 kyr BP (about 15.5 cal kyr BP). The weighted average of the 14C age of the outermost 5 rings is 13,133 +/- 33 BP, which can be calibrated to 15,363-15,679 cal BP by using the IntCal04 standard curve (Reimer et al. 2004). The estimated delta-14C values range between 265 and 300 and show approximately sinusoidal fluctuation of an indicated ~200-yr cycle, perhaps reflecting contemporary solar activity change. Comparison between the tree 14C profile and the Cariaco Basin 14C record provides further information on the accurate date of the Towada Hachinohe buried forest and the eruption that produced it. 14C analysis of tree rings from the buried forest may contribute to the construction of a better 14C calibration curve and the elucidation of solar activity change during the last glacial period, as well as possible global and regional impacts of the huge eruption from Towada Volcano.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202

Radiocarbon Analysis of Tree Rings from a 15.5-cal kyr BP Pyroclastically Buried Forest: A Pilot Study

From the 19th International Radiocarbon Conference held in Keble College, Oxford, England, April 3-7, 2006.We have determined the radiocarbon ages for 40-yr-interval tree rings in 2 fossil trees of the Towada Hachinohe buried forest, northeastern Honshu Island, Japan. The 14C ages range from 13.0 to 13.3 kyr BP (about 15.5 cal kyr BP). The weighted average of the 14C age of the outermost 5 rings is 13,133 +/- 33 BP, which can be calibrated to 15,363-15,679 cal BP by using the IntCal04 standard curve (Reimer et al. 2004). The estimated delta-14C values range between 265 and 300 and show approximately sinusoidal fluctuation of an indicated ~200-yr cycle, perhaps reflecting contemporary solar activity change. Comparison between the tree 14C profile and the Cariaco Basin 14C record provides further information on the accurate date of the Towada Hachinohe buried forest and the eruption that produced it. 14C analysis of tree rings from the buried forest may contribute to the construction of a better 14C calibration curve and the elucidation of solar activity change during the last glacial period, as well as possible global and regional impacts of the huge eruption from Towada Volcano.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202