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Upper Formation Matsumoto, 1939
- Coherent formation
- Late Cretaceous, late Coniacian or later (86.4, 83.6, 82.1 Ma, FT)
- Correlation: Bottom of Onogawa Group
- Sedimentary facies: Terrestrial
- Lithofacies: Mudstone
- Lithofacies (Minor): Conglomerate, Sandstone, Tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kumamoto city, Kumamoto pref.
- Ikegami et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.127-130 DOI