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

doi:10.2517/2016PR001

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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, 20(4):302-311 (2016). https://doi.org/10.2517/2016PR001

Abstract

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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Yuka Miyake, Yukiyasu Tsutsumi, Kazunori Miyata, and Toshifumi Komatsu "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," Paleontological Research 20(4), 302-311, (1 October 2016). https://doi.org/10.2517/2016PR001

Received: 16 January 2015; Accepted: 1 January 2016; Published: 1 October 2016

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