Tochinaigawa Formation

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Tochinaigawa Formation Ozawa, 1962

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

Lithofacies: Mudstone
Lithofacies (Minor): Acidic tuff, Sandstone, Shale, Conglomerate

Thickness: 150 - 400 m
Lower limit (Matsukitai Formation): Bottom of mudstone bearing bed
Upper limit: Conformity (Matsukitai Formation), Conformity? (Taiaki Formation), Conformity, partly unconformity (Soma Agglomerate Formation)
Lower limit: Bottom of the hard mudstone bed
Lower limit: Conformity (Yuguchiyama 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: Sponges (Sagarites (Makiyama) chitanii), Bivalves, Gastropods

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.)