Some middle Miocene planktonic microfossil datum planes in Northern Honshu, Japan: Their paleoceanographic implications

Yokichi Takayanagi1, Motoyoshi Oda1, Shiro Hasegawas1, Nobuyuki Honda1, Toshiaki Maruyama1, Masaaki Funayama2
1Institute of Geology and Paleontology, Tohoku University, Sendai, 980, Japan
2Teikoku Oil Company, Hatagaya, Shibuya-ku, Tokyo 151 Japan

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