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Ayukawa Formation
- Coherent formation
- southern Yezo Forearc basin (Jobanoki basin)
- middle Miocene
- Sedimentary facies: Marine
- Sedimentary facies: Shelf - Upper continental slope
- Taga Group (Ayukawa, Ibaraki pref.)
- [ Upper ]
- ?--?--?--?--?-
- Ayukawa Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ayukawa?, Hitachi city, Ibaraki pref.
- Tephra: Ayukawa Tephra (Izura Tephra)
- Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI