Yuguchiyama Formation

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Yuguchiyama Formation Ozawa, 1962

Type locality: Tochinai river, Soma, Hirosaki city, Aomori prefecture
Coherent formation
Miocene

Lithofacies: Acidic lapilli tuff, Acidic tuff, Mudstone
Lithofacies (Minor): Andesitic lapilli tuff, Rhyolite lava, Sandstone, Andesitic tuff, Andesitic tuff breccia

Thickness: 150 - 500 m
Upper limit: Bottom of the hard mudstone bed
Upper limit: Conformity (Tochinaigawa Formation)
Lower limit: Bottom of the bed intercalating mudstone thin layers
Lower limit: Conformity (Kuroishizawa Formation)

Hirosaki, Aomori pref.
[ Upper ]
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Tochinaigawa Formation
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Yuguchiyama Formation
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Kuroishizawa Formation
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Fujikuragawa Formaiton
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Tochinai river, Soma, Hirosaki city, Aomori pref.
Fossils: Shellfishes

Ozawa (1962) Hirosaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 5p.)