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Kijigoya Formation (Suzuki et al., 1964) Yamamoto, 1994
Invalid synonym: Sengan Tuff (Debris avalanche deposit), Kijigoya Tuff
- Type locality: Road Lake Line, Kitashiobara city, Yama county, Fukushima prefecture
- Volcanic rocks
- Caldera-fill sediments
- late Miocene (8.8 Ma, K-Ar, Dykes)
- Sedimentary facies: Pyroclastic flow deposit, Debris avalanche deposit
- Sedimentary facies (Intrusive rocks): Dykes, Arc-shaped dykes
- Lithofacies: Breccia
- Lithofacies (Intrusive rocks): Orthopyroxene clinopyroxene dacite
- Lithofacies (Intrusive rocks, Minor): Orthopyroxene clinopyroxene hornblende dacite
- Kijigoya Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Post-caldera stage intrusive rocks
- ~~~~~~~~~~~~~~
- Akimotoko Pyroclastic Flow Deposit / Debris avalanche deposit
- ~~~~~~~~~~~~~~
- [ Lower ]
- Kijigoya caldera
- [ Upper ]
- ~~~~~~~~~~~~~~
- Kijigoya Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Road Lake Line - Lake Onogawa, Kitashiobara city, Yama county, Fukushima pref.; Mount Nunomori, Inawashiro city, Yama county, Fukushima pref.
- Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
- Hasegawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.33-48 DOI