Yunokawa Green Tuff Member

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Yunokawa Green Tuff Member

Type locality: Yunokawa, Kawauchi town, Mutsu city, Aomori prefecture
Volcanic rocks
Miocene
Correlation: Ohatagawa Green Tuff Member, Yunokawa Formation

Sedimentary facies: Marine
Lithofacies: Andesitic - dacitic tuff, tuff breccia
Lithofacies (Minor): Mudstone, Sandstone, Andesitic - dacitic lava
Lithofacies (Basal): Conglomerate

Upper limit: Unconformity (Ikokuma Andesites)
Lower limit: Unconformity (Sai Formation)

Yagen Formation (Sai, Aomori pref.)
[ Upper ]
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Yunokawa Green Tuff Member / Yunokogawa Sandstone and Mudstone Member
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[ Lower ]

Sai - Ohata river, Aomori pref.
[ Upper ]
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Ikokuma Andesites
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Yagen Formation
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Sai Formation
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[ Lower ]

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

Distribution: Sai city, Shimokita county, Aomori pref.; Yunokawa, Kawauchi town, Mutsu city, Aomori pref.

Uemura (1962) Oma and Sai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 6p.)