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Miwa Formation

• Coherent formation
• early - middle Pleistocene

• Sedimentary facies: Terrace deposits
• Lithofacies: Gravels
• Lithofacies (Minor): Sands, Clay

• Thickness: ca. 25 m
• Distribution (East - West): 7 km
• Distribution (South - North): 3 km
• Lower limit: Unconformity (Kuga Group, Mikawa Group)

• Distribution: Kurosawa - Kakinokibara, Iwakuni city, Yamaguchi pref.

• Higashimoto et al. (1986) Geology of the Otake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)