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Akashima Formation
- Type locality: near Akashima island, Toga, Oga city, Akita prefecture
- Coherent formation
- Late Cretaceous (72.0 Ma, U-Pb; 65 - 59 Ma, FT)
- Sedimentary facies: Marine
- Lithofacies: Orthopyroxene-clinopyrocene dacite
- Lithofacies (Upper): Welded pyroclastic rocks
- Lithofacies (Lower, Main): Volcanic breccia
- Lithofacies (Lower, Minor): Granite blocks
- Thickness: 200 m or thicker
- Akashima Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Nyudozaki Pyroclastic Rocks Miyagi and Uruno, 1959
- --------------
- Akashima Lava Miyagi and Uruno, 1959
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Nyudo, Kitaura, Oga city, Akita pref.; Akashima island, Toga, Oga city, Akita pref.
- Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
- Kano et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.6, pp.351-364 DOI
- Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI