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Ayama Formation
- Coherent formation
- Pliocene (3.1 - 2.8 Ma)
- Sedimentary facies: Terrestrial
- Sedimentary facies: Wide and deep lake
- Lithofacies: Clay
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hananoki hills, Iga city, Mie pref.; Oyamada city, Mie pref.
- Tepha: Jisonji Tuff Bed (Yubune Tuff Bed), Hokke II Tuff Bed, Masugi Tuff Bed, Tamataki Tuff Bed
- Satoguchi (2015) Jour. Geol. Soc. Japan, vol.121, no.4, pp.125-139, DOI
- Satoguchi et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.70-78 DOI