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(Invalid name)Tsugawa Formation

It was separated and re-defined to the upper Otani Formation and the lower Tonoiri Formation.

• Coherent formation
• Miocene

• Lithofacies: Altered pyroclastic rocks

• Upper limit: Conformity (Nanatani Formation)
• Lower limit: Conformity (Mikawa Formation), Unconformity

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Niigata plain, Niigata pref.; Tsugawa, Aga city, Higahikanbara county, Niigata pref.

• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.11, pp.XVII-XVIII
• Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI