Akakura Tuff Member

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Akakura Tuff Member

Type locality: Akakura, Mamurogawa city, Mogami county, Yamagata prefecture
Volcanic rocks
Miocene

Lithofacies: Andesite lapilli tuff
Lithofacies (Minor): Andesite tuff breccia, Lava, Andesitic basalt lava

Thickness: 600 m or thicker
Upper limit: Boundary between the lower lapilli tuff dominant horizon and the upper tuff breccia dominant horizon
Upper limit: Transitional (Sugisawa Tuff Breccia Member), Conformity (Hokizawa Tuff Breccia Member)
Lower limit: Boundary between the lower tuff breccia dominant horizon and the upper lapilli tuff dominant horizon
Lower limit: Transitional (Nakanomata Tuff Breccia Member), Unconformity (Basement)

Nozoki Formation
[ Upper ]
-------/~~~~~~
Sugisawa Tuff Breccia Member / Hokizawa Tuff Breccia Member
--------------
Akakura Tuff Member
--------------
Nakanomata Tuff Breccia Member
~~~~~~~~~~~~~~
[ Lower ]

Uzen-Kaneyama (Western)
[ Upper ]
--------------
Mamurogawa Formation
--------------
Kamabuchi Formation
--------------
Otaki Formation
--------------
Kaneyama Formation
-------~~~~~~~
Nozoki Formation
~~~~~~~~~~~~~~
[ Lower ]

Uzen-Kaneyama (Eastern)
[ Upper ]
--------------
Sanzugawa Formation
~~~~~~~~~~~~~~
Torakeyama Formation
~~~~~~~~~~~~~~
Nozoki Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Akakura - Shione river, Mamurogawa city, Mogami county, Yamagata pref.; Gamasawa creek - Kaneyama river, Kaneyama town, Mogami county, Yamagata pref.

Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)