The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Fission-track ages of Middle Miocene to Pliocene tuffs and a lava from the Yuda Basin, Iwate Prefecture, Northeast Japan
Takeshi Nakajima, Tohru Danhara
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Keywords: Pliocene
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1999 Volume 105 Issue 9 Pages 668-671

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Abstract
Results of fission-track datings of tuffs and a lava from sedimentary units in the Yuda Basin, Iwate Prefecture range from 14 to 3.5 Ma.Therefore, the Kotsunagizawa, Kurosawa and Hanayama Formations distributed in the Yuda Basin are Middle Miocene to Pliocene in Age.
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© The Geological Society of Japan
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