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Oguni Formation

• Coherent formation
• middle - late Pleistocene

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

• Thickness: ca. 40 m
• Lower limit: Unconformity (Zenitsuboyama Formation, Older Ryoke Granites)

• Distribution: Hizumi - Oguni - Osato - Shimonagano, Yanai city, Yamaguchi pref.

• Higashimoto et al. (1983) Geology of the Iwakuni District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 6p.)