Hokizawa Tuff Breccia Member

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Hokizawa Tuff Breccia Member

Type locality: Hokizawa, Mamurogawa city, Mogami county, Yamagata prefecture
Volcanic rocks
Miocene
Contemporaneous heterotopic facies: Sugisawa Tuff Breccia Member

Lithofacies: Rhyolite tuff breccia
Lithofacies (Minor): Rhyolite lapilli tuff, Lava, Basalt tuff breccia

Thickness: 250 m or thicker
Lower limit: Conformity (Akakura Tuff Member)

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: Hokizawa - Ogachi pass, Mamurogawa city, 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.)