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Lower Formation Matsumoto, 1939

• Coherent formation
• Late Cretaceous, late Coniacian or later (93.1, 89.8 Ma, FT)

• Sedimentary facies: Marine, Brackish
• Sedimentary facies: Shallow marine
• Lithofacies: Sandstone, Mudstone

• Thickness: 500 - 1,350 m

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

• Distribution: Kumamoto city, Kumamoto pref.
• Fossils (Shellfishes): Eucalycoceras cf. spathi, Actinoceramus temurai

• Ikegami et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.127-130 DOI