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Tomikusa Group

• Coherent formation
• First Seto Inland Sea
• Sedimentary basin in island arc
• Miocene (18 - 17 Ma, Diatoms)

• Sedimentary facies: Marine, Terrestrial

• Thickness: 430 m
• Upper limit: Unknown
• Lower limit: Thust fault (Ryoke Granitoids)

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

• Distribution: Tenryu river, Anan city, Nagano pref.
• Fossils: Shellfishes, Plants, Mammals

• Sako and Hoshi (2014) Jour. Geol. Soc. Japan, vol.120, no.8, pp.255-271 DOI