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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

• 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, Middle I Terrace Deposits, Kamishiraki Formation, Otaniike Formation, Kawarada Formation)
• Lower limit: Unconformity (Nakamura Formation, Akechi 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. (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.)
• 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.)