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Dochi Formation Iwai and Suzuki, 1957
This had been a part of Wadagawa Formation since 1976.
- Type locality: Dochi, Shichinohe city, Kamikita county, Aomori prefecture
- Coherent formation
- Miocene
- Correlation: Nuruyu Formation
- Sedimentary facies: Marine
- Depth of water: Relatively deep
- Lithofacies: Mudstone
- Lithofacies (Minor): Tuffaceous sandstone, Lapilli tuff
- Sedimentary structures: Paralle stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Dochi river, Dochi, Shichinohe city, Kamikita county, Aomori pref.; Sashikubo, Takizawa, Towada city, Aomori pref.; Hyakko creek, Towada city, Aomori pref.
- Fossils (Bivalves): Conchocele sp., Cocuelina sp., Delectopecten peckhami, Limatula kurodai, Lucinoma acutilineata
- Fossils (Foraminifera): Bulimina aculeata, Bulimina cf. inflata, Martinottiella communis, Oolina costata, Sphaeroidina sp., Trifarina hughesi, Uvigerina akitaensis, Cyclammina japonica, Amphicoryna sp., Floritus sp., Fursenkoina complanata, Globobulimina cf. perversa, Globocassidulina subglobosa, Melonis pompilioides, Trifarina kokozuraensis, Valvulineria cf. sadonica, Haplophragmoides sp.
- Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)