We obtained zircon U—Pb ages using LA-ICP-MS for an acidic tuff bed in the upper part of the Akasaki Formation, a basal unit of the Eocene sequence in the Amakusa area, Kumamoto Prefecture, Japan. The U—Pb age of 49.1±0.4 Ma (95% confidence interval) suggests a late early Eocene age. Our result is important for biochronological assessment of the land mammal fauna of the Akasaki Formation. The new age date supports the correlation of the Akasaki mammal fauna with the Bridgerian North American Land Mammal Age.
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1 October 2016
LA-ICP-MS Zircon U—Pb Dating of Acidic Tuff from the Eocene Akasaki Formation, Amakusa, Kumamoto Prefecture, Western Kyushu, Japan: Implications for the Age of the Land Mammal Fauna in Japan
Yuka Miyake,
Yukiyasu Tsutsumi,
Kazunori Miyata,
Toshifumi Komatsu
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Paleontological Research
Vol. 20 • No. 4
October 2016
Vol. 20 • No. 4
October 2016
Akasaki Formation
Arshantan
Bridgerian
Eocene
U-Pb age
zircon