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- Type locality: Koiwai, Morioka city, Iwate prefecture
- Pleistocene - Holocene
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Koiwai, Morioka city, Iwate pref.; Wakare, Sugo, Takizawa city, Iwate pref.
- Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)