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Oku Formation Sato et al., 2022

• Type locality: Shirimi - Shoda, Oku town, Setouchi city, Okayama prefecture
• Volcanic rocks
• Late Cretaceous (ca. 7.17 Ma, U-Pb)

• Sedimentary facies: Terrestrial
• Lithofacies: Rhyolite welded tuff

• Thickness: 150 m or thicker
• Distribution (East - West): 6.5 km
• Distribution (South - North): 5.5 km
• Lower limit: Unconformity (Mushiage Unit, Takasagoyama Formation, Yotsujiyama Formation)

• Distribution: Shirimi - Shoda - Nagahama - Nishisue - Takayama - Honjo, Oku town, Setouchi city, Okayama 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.)