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Kotachi Gravel Bed Imamura et al., 1953

• Type locality: Sukumoji - Shimokotachi, Akitakata city, Hiroshima prefecture
• Coherent formation
• Pliocene
• Interfingered: Mengameyama Basalt

• Lithofacies: Gravels
• Lithofacies (Minor): Sands, Silt, Clay, Wood fragments

• Thickness: 10 - 20 m
• Lower limit: Unconformity (Mitsumori Granite)

• Distribution: Sukumoji - Shimokotachi - Miwa town - Seranishi town - Sera town, Akitakata city, Hiroshima pref.; Okamibuchi, Miyoshi city, Hiroshima pref.

• Matsuura (1990) Geology of the Akana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)