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Fission-Track Ages of Tuff Layers Related to the Pliocene-Pleistocene Boundary on the Boso Peninsula, Japan

Published online by Cambridge University Press:  20 January 2017

Masao Kasuya
Masao Kasuya*
Affiliation:
Department of Physics, Faculty of Science, Osaka University, Machikaneyama, Toyanaka 560, Japan
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Abstract

Fission-track ages of zircon crystals from four tuff layers in the late Cenozoic sediment sequence of the Boso Peninsula,.Japan, are 1.6 ± 0.2 myr (the Kurotaki Formation), 5.5 ± 0.6 and 5.2 ± 0.5 myr (the uppermost part of the Amatsu Formation), and 11.5 ± 0.8 myr (the middle part of the Amatsu Formation). These ages provide numerical age constraints on magneto-biostratigraphy. The normal polarity interval in the lower part of the Kiwada Formation corresponds to the Olduvai polarity subzone. The boundary between the Pliocene and Pleistocene lies slightly above the Olduvai polarity subzone.

Type
Articles
Information
Quaternary Research , Volume 33 , Issue 1 , January 1990 , pp. 86 - 93
Copyright
University of Washington

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