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Tomisuyama Formation Yamashita et al., 2006

Invalid synonym: Sugeta Formation, Ozu Formation, Ozu Gravel, Uchiko Formation, Uchiko Gravel

• Type locality: Kaminishi, Ozu city, Ehime prefecture
• Coherent formation
• early Pleistocene (18,000 yBP, ¹⁴C)

• Sedimentary facies: Fluvial
• Sedimentary facies (Minor): Alluvial fan
• Lithofacies: Gravels
• Lithofacies (Minor): Silt

• Thickness: ca. 60 - 150 m
• Lower limit: Unconformity (Kannan Unit)

• Distribution: Kaminishi - Mount Tomisuyama - Tokunomori - Kitayama - Sugeta - Taguchi - Ichiki - Uzu - Koinoki - Fujinokawa - Itano, Ozu city, Ehime pref.; Ikazaki - Uchiko - Shigematsu, Uchiko city, Kita county, Ehime pref.
• Fossils (Plants): Chamaecyparis pisifera, Fagus microcarpa, Juglans megacinerea, Metasequoia sp., Picea koribai
• Tephra: Tomisuyama 1, Tomisuyama 2, Tomisuyama 3, Tomisuyama 4, Tomisuyama 5, Tomisuyama 6, Tomisuyama 7, Tomisuyama 8, Tomisuyama 9, Tomisuyama 10, Tomisuyama 11, Tomisuyama 12

• 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.)