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Iyoki Formation Banno et al., 2010

Invalid synonym: Ozu Formation, Ozu Gravel

• Type locality: Iyoki, Uchiko city, Kita county, Ehime prefecture
• Coherent formation
• middle Pleistocene (0.65, 0.62, 0.6 Ma, FT, Tephra)

• Sedimentary facies: Fluvial
• Lithofacies: Gravels
• Lithofacies (Minor): Silt, Sands, Tuff

• Thickness: 20 - 30 m
• Lower limit: Unconformity (Sanbagawa Metamorphic Rocks)

• Distribution: Nishimine - Kamisukaigawa river - Niiya - Yanagisawa - Kitayama - Shirataki - Azo - Hirano - Myogadani, Ozu city, Ehime pref.; Iyoki - Shobu - Kawanouchi - Ronden - Shiromawari - Kawanaka - Ose - Fukuoka - Takamori, Uchiko city, Kita county, Ehime pref.
• Fossils: Chamaecyparis pisifera
• Tephra: Shobu

• Miyazaki (2024) Geology of the Iyo-Nagahama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 155p. (in Japanese with English abstract 5p.)
• Banno et al. (2010) Geology of the Ozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 58p. (in Japanese with English abstract 2p.)