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Naarai Formation
- Type locality: Byobugaura seashore, Choshi city, Chiba prefecture
- Coherent formation
- Plioecene - Pleistocene
- Lithofacies (Main): Tuffaceous sandstone
- Lithofacies (Minor): Pumiceous tuff, Silty tuff
- Lithofacies (Bottom): Basal conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Port Naarai, Chosi city, Chiba pref.
- Fossils (Derived fossils, Ammonoids): Puzosia subcorbarica, Mortoniceras, Virgatosphinctes sp., Usseliceras (Usseliceras) sp.
- Fossils (Derived fossils, Radiolarians): Cryptamphorella ssp., Holocryptocanium barbui
- Tephra: Tn-GP
- Kashiwagi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.9, pp.647-652 DOI
- Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI
- Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.7, pp.360-373 DOI