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Magnetostratigraphy of the Late Cenozoic of the Boso Peninsula, Central Japan

Published online by Cambridge University Press:  20 January 2017

Hisao Nakagawa  and
Nobuaki Niitsuma
Hisao Nakagawa
Affiliation:
Institute of Geology and Paleontology, Faculty of Science and Department of Earth Sciences College of General Education, Tohoku University, 980 Sendai, Japan
Nobuaki Niitsuma
Affiliation:
Institute of Geology and Paleontology, Faculty of Science and Department of Earth Sciences College of General Education, Tohoku University, 980 Sendai, Japan
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Abstract

Marine Pliocene and Pleistocene beds of the Boso Peninsula are more than 3 km thick and contain abundant fauna and flora. Almost continuous deposition occurred at a high sedimentation rate from the early part of the last reversed geomagnetic polarity epoch to the middle part of the last normal polarity epoch. Several microbiostratigraphic marker horizons enable correlation with deep-sea sediments fully independent of magnetostratigraphic zonation. Globorotalia truncatulinoides first occurs below the normal polarity event BO-B-2, which is correlated with the Olduvai Event in deep-sea sediments, whereas the disappearance of discoasters and the first occurrence of Gephyrocapsa caribbeanica are recognized at the top of BO-B-2, and the first occurrence of Gephyrocapsa oceanica is recognized at the top of BO-B-1. Based on the correlation of the Boso section with Mediterranean stage stratotype sections, the transition from the Pliocene to Pleistocene is estimated to be in the lower part of the Kazusa Group.

Type
Research Article
Information
Quaternary Research , Volume 7 , Issue 3 , May 1977 , pp. 294 - 301
Copyright
University of Washington

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