Innai Tuff Member

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Innai Tuff Member (Kato, 1955) Taguchi, 1960

Invalid synonym: Innai Tuff

Type locality: Innai, Yuzawa city, Akita prefecture
Volcanic rocks
Miocene
Contemporaneous heterotopic facies: Lower Onnagawa Formation

Sedimentary facies: Submarine pyroclastic rocks
Lithofacies: Acidic pumice tuff
Lithofacies (Minor): Acidic lapilli tuff, Rhyolite lava, Mudstone, Andesite lapilli tuff, Tuff breccia

Thickness: 400 - 600 m
Upper limit: Unconformity (Sanzugawa Formation)

Onnagawa Formation (Asamai)
[ Upper ]
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Yokoyama Dacite / Numadate Andesite
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Main part
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Innai Tuff Member
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[ Lower ]

Asamai - Yuzawa, Akita pref.
[ Upper ]
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Onnagawa Formation
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Sugota Formation
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Hatamura Formation
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Iizawa Formation / Sarakawa Formation
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Yunosawagawa Formation
~~~~~~~~~~~~~~
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Innai, Yuzawa city, Akita pref.

Ozawa et al. (1979) Geology of the Asamai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 4p.)
Ozawa et al. (1979) Geology of the Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 4p.)