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Ohayama Formation
- Volcanic rocks
- Akakura caldera fill
- Mount Ohayama resurgent dome
- Pleistocene (1.0 Ma, FT)
- Sedimentary facies: Caldera forming ash-flow, Debris avalanche deposit
- Lithofacies: Felsic welded lapilli tuff, Tuff breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: central part of Akakura caldera, Kurikoma area, Yamagara pref. - Miyagi pref.
- Otake (2007) Jour. Geol. Soc. Japan, vol.113, no.11, pp.549-564 DOI