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Kumai Formation

• Coherent formation
• Early Cretaceous, Albian - Late Cretaceous, Cenomanian

• Lower limit: Unconformity (Kurosegawa Belt, Northern Chichibu Belt)

• Distribution: Wakayama pref.

• Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI