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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
- 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.)