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Oizumi Formation (Matsui, 1943)

• Type locality (Upper): Lake Kasadaike, Inabe town, Inabe city, Mie prefecture
• Type locality (Lower): Kasadashinden, Inabe town, Inabe city, Mie prefecture
• Coherent formation
• Fluvio-lacustrine basin including Lake Tokai
• Pliocene - Pleistocene (ca. 2.0 Ma)
• Transitional: Tara Formation

• Sedimentary facies: Fluvial, Lacustrine
• Sedimentary facies: Meandering river
• Lithofacies (Upper): Sand-dominant interbedded sands and silt
• Lithofacies (Lower): Silt-dominant interbedded sands and silt
• Lithofacies (Minor): Gravels, Sands, Lignite
• Sedimentary structures: Parallel stratification, Planar cross-stratification, Trough cross-stratification, Epsilon cross-stratification
• Paleocurrent: to South - Southwest - Southeast

• Thickness: ca. 80 - 800 m
• Thickness (Upper): ca. 200 m
• Thickness (Lower): ca. 50 m
• Upper limit: Transitional (Komeno Formation), Unconformity (Chikarao Formation)
• Lowr limit: Transitional (Ichinohara Formation, Kuragari Formation, Tashidagawa Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kasadashinden - Lake Kasadaike - Aibagawa river - Makitagawa river - Sushirodani valley - Kanae - Komeno, Inabe city, Mie pref.; Mukohira - Kawahara - Higashikoyamatanigawa river, Hokusei town, Inabe city, Mie pref.; Nishinojiri, Fujiwara town, Inabe city, Mie pref.; Minamikanai, Daian town, Inabe city, Mie pref.; Odakakogen, Komono city, Mie county, Mie pref.; Kareigawa river, Kuwana city, Mie pref.; Kamiebi town - Kosugishinmachi town - Midorigaoka town, Yokkaichi city, Mie pref.; Sanjo?, Nakano city, Yokkaichi city, Mie pref.
• Fossils: Stegodon akashiensis
• Fossils (Plants): Aesculus turbinata, Alunus japonica, Camellia sp., Carex sp., Fagus hayatae, Juglans cinerea, Juglans megacinerea, Metasequoia disticha, Metasequoia japonica, Paliurus nipponicus, Phragmites sp., Picea koribai, Picea maximowiezii, Quercus dentata, Quercus variabilis, Rosa sp., Sarex sp., Styrax japonica
• Tephra: Pumice Tephra, Bando I Tephra, Bando II Tephra, Hy, Sushirodani Tephra, Kanae Tephra, Komeno I Tephra, Komeno II Tephra, Komeno III Tephra, Kamiaiba Tephra, Sugitani I Tephra, Sugitani II Tephra, Sugitani III Tephra, Sugitani IV Tephra, Rokkoku Tephra, Sonohara Tephra, Obuke Tephra, Ishigurekitayama Tephra, Niugawa Tephra

• Yoshida et al. (1991) Geology of the Kuwana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 154p. (in Japanese with English abstract 5p.)
• Harayama et al. (1989) Geology of the Gozaishoyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 145p. (in Japanese with English abstract 6p.)
• Yoshida (1984) Geology of the Yokkaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 5p.)
• Takada et al. (1979) Geology of the Tsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 56p. (in Japanese with English abstract 5p.)
• Miyamura et al. (1976) Geology of the Hikonetobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 6p.)