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Gankaizan Formation

• Coherent formation
• Late Cretaceous, Coniacian - Santonian (Bivalves)

• Lithofacies: Conglomerate

• Lower limit: Parallel unconformity (Mifune Group)

• Distribution: Kumamoto city, Kumamoto pref.
• Fossils: Inoceramus amakusensis

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