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Tokai Group

Invalid synonym: Seto Group (Local name in Tono region, Gifu pref. - Nagoya region, Aichi pref.), Age Group (Local name in west coarst of Ise bay), Kuwana Group, Tokoname Group

• Coherent formation
• Fluvio-lacustrine basin including Lake Tokai
• middle Miocene - Pleistocene
• Correlation: Sakuraiji Clastic Dike?

• Sedimentary facies: Fluvial, Lacustrine
• Sedimentary facies: Meandering river, Flood plain
• Lithofacies (Upper): Sands, Gravels
• Lithofacies (Middle): Clay, Lignite, Sands
• Lithofacies (Lower): Gravels

• Thickness: 1,500 - 2,000 m or thicker
• Thickness (Upper): 20 m or thinner
• Thickness (Middle): 20 m or thicker
• Area: ca. 6,000 m²
• Volume: ca. 300 km³
• Upper limit: Unconformity (Ueno Basaltic Rocks, Older Fan Deposits (Gifu pref.), Middle I Terrace Deposits, Kamishiraki Formation, Otaniike Formation, Kawarada Formation, Old Fan Deposits (Mie pref.), Middle Fan Deposits (Mie pref.), Sakura Terrace Deposits, Taketoyo Formation, Kamezaki Terrace Deposits, Lower Taya Formation, Honshiromatsu Formation)
• Lower limit: Unconformity (Nakamura Formation, Akechi Formation, Utsumi Formation)

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

• Distribution: Aichi pref. - Gifu pref. - Mie pref.
• Distribution: Fukuoka - Yamanotagawa - Ochiai - Misaka, Nakatsugawa city, Gifu pref.
• Fossils (Upper, Shellfishes): Anodonta sp., Cristaria sp., Lanceolaria oxyrhyncha, Limnuim (Inversidens) reiniana, Semisarcospira sp., Unio margarififera, Viviparus (Cipangopaldina) japonicus, Viviparus cf. histricus
• Fossils (Plants): Cumminghamia sp., Fagus cf. ailanthoides, Nyssa pachycarpa, Nyssa rugosa, Sequoia sempervirens, Stewaitia cf. monadelpha, Styrax microcarpa

• Nakashima et al. (2021) Geology of the Toyota District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 91p. (in Japanese with English abstract 4p.)
• Yamasaki et al. (2020) Geology of the Akechi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 120p. (in Japanese with English abstract 5p.)
• Ueki et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.3, pp.227-236 DOI
• Hatano and Yoshida (2018) Jour. Geol. Soc. Japan, vol.124, no.3, pp.191-205 DOI
• Hoshi et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.9, pp.313-323 DOI
• Hoshi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.10, pp.679-692 DOI
• Sasao et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.476-481 DOI
• Yoshida and Wakita (1999) Geology of the Gifu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 71p. (in Japanese with English abstract 4p.)
• Yoshida et al. (1995) Geology of the Tsu-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)
• 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.)
• Kondo and Kimura (1987) Geology of the Morozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
• Yoshida (1987) Geology of the Tsu-Tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 5p.)
• Yoshida and Ozaki (1986) Geology of the Handa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 98p. (in Japanese with English abstract 4p.)
• Sakamoto et al. (1986) Geology of the Nagoya-Nambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 3p.)
• Sakamoto et al. (1984) Geology of the Nagoya-Hokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 64p. (in Japanese with English abstract 3p.)
• Miyamura et al. (1981) Geology of the Kameyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 9p.)
• 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.)
• Kawata (1961) Tsukechi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 7p.)
• Yamada and Murayama (1958) Tsumago, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 9p.)