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Akitsu Formation Matsuura, 2001

• Type locality: Kanayama, Akitsu town, Higashihiroshima city, Hiroshima prefecture
• Coherent formation
• Eocene - Oligocene (30.3 Ma, FT)

• Sedimentary facies: Fluvial
• Lithofacies (Upper): Sandstone
• Lithofacies (Middle): Mudstone
• Lithofacies (Lower): Sandstone
• Lithofacies (Basal): Conglomerate
• Lithofacies (Minor): Tuffaceous mudstone

• Thickness: ca. 40 m
• Distribution (East - West): 1.5 km
• Distribution (South - North): 0.5 km
• Lower limit: Unconformity (Haigamine Formation)

• Distribution: Mitsu - Kanayama - Sakakiyama - Naka, Akitsu town, Higashihiroshima city, Hiroshima pref.

• Sato et al. (2022) Geology of the Wake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 106p. (in Japanese with English abstract 4p.)
• Sato et al. (2016) Geology of the Banshu-Ako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p. (in Japanese with English abstract 3p.)
• Matsuura (2001) Geology of the Mitsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 4p.)