Kosamuzawa Tuff Member

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Kosamuzawa Tuff Member

Type locality:
Coherent formation
Miocene

Lithofacies: Andesitic tuff, Tuffaceous sandstone

Upper limit: Unconformity (Ichinonohara Tuff Member, Kunimiyama Andesite)

Maekawa Formation
[ Upper ]
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Main part
'''''''/,,,,,,
Kosamuzawa Tuff Member
'''''''/,,,,,,
Main part
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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
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Oarasawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kosamu creek - Osamu creek - Osawa creek - Maekawa river, Oshu city, Iwate pref.; Narusawa hot spring - Onikabe creek - Kitamata river, Ichinoseki 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.)