Ichinonohara Tuff Member

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Ichinonohara Tuff Member

Type locality: Iwai river, Ichinonohara, Ichinoseki city, Iwate prefecture
Volcanic rocks
Miocene

Lithofacies: Tuff breccia
Lithofacies (Minor): Dacite lava, Agglomerate, Tuffaceous siltstone, Siltstone

Thickness: 400 m
Upper limit: Unconformity (Kunimiyama Andesite)
Lower limit: Unconformity (Kosamuzawa Tuff Member, Maekawa Formation)

Orose Formation
[ Upper ]
--------------
Upper part
'''''''/,,,,,,
Lower part / Ichinonohara Tuff Member
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[ Lower ]

Mount Yakeishidake, Iwate pref.
[ Upper ]
~~~~~~~~~~~~~~
Mizuyama Formation
~~~~~~~~~~~~~~
Orose Formation
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Maekawa Formation
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Nishikozawa Formation
'''''''/,,,,,,
Oidegawa Formation
--------------
Oarasawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Iwai river, Ichinonohara, Ichinoseki city, Iwate pref.; Mount Takahino - Mount Takate - Minamimata river - Onikabe creek, Oshu city, Iwate pref.

Kitamura (1965) Yakeishi-dake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 8p.)