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Toya Formation (Ogasawara et al., 1986) Tuzino et al., 2018
- Type locality: Toya, Nanbu city, Sannohe county, Aomori prefecture - Furuyashiki, Karumai city, Kunohe county, Iwate prefecture
- Coherent formation
- Miocene - Pliocene (6 - 5 Ma, Radiometric age)
- Contemporaneous heterotopic facies: Togawa Formation (Bottom)
- Sedimentary facies: Terrestrial
- Sedimentary facies: Flood plain, Wetlands associated with meandering rivers
- Sedimentary facies (Minor): Small scale lakes
- Lithofacies: Pyroclastic flow deposit (3 units or more)
- Lithofacies (Minor): Pyroclastic fall deposit, Re-worked volcaniclastics
- Lithofacies: Pumice volcanic lapilli tuff, Tuff, Mudstone, Sandstone, Conglomerate, Lignite
- Sedimentary structures: Trough cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Toya, Nanbu city, Sannohe county, Aomori pref.; Niida - Hareyama - Dake - Miyazawa - Karumai, Karumai city, Kunohe county, Iwate pref.; Takiya - Nishiyama - Kogura, Kunohe city, Kunohe county, Iwate pref.
- Fosils: Plants fragments
- Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)