Hasshikidai Mudstone Member

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Hasshikidai Mudstone Member Ozawa and Sumi, 1961

Type locality: Shione river, Kamabuchi, Mamurogawa city, Mogami county, Yamagata prefecture
Coherent formation
Miocene
Contemporaneous heterotopic facies: Haruki Tuff Member
Intruded by: Manaitayama Andesites

Lithofacies: Tuffaceous - sandy mudstone
Lithofacies (Minor): Dacite tuff, Tuffaceous - muddy sandstone

Thickness: 150 - 200 m
Upper limit: Bottom of Sandstone-dominant horizon
Upper limit: Transitional (Kuriyazawa Sandstone Member), Conformtiy (Ushirokawa Tuff Breccia Member)
Lower limit: Transitional (Otaki Formation)

Kamabuchi Formation
[ Upper ]
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Sekizawa Tuff Member
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Kuriyazawa Sandstone Member
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Ushirokawa Tuff Breccia Member / Awanotaki Tuff Breccia Member
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Haruki Tuff Member / Hasshikidai Mudstone Member
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[ Lower ]

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

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

Distribution: Shione river, Kamabuchi, 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.)