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Natori Group (Inai, 1939) Kitamura, 1967

Some researchers suggest that Kaneyama Formation, Tenmyosan Volcanic Rocks and Shiote Formation should be included in this group.

• Coherent formation
• early - late Miocene
• Correlation (Upper): Shida Group
• Correlation (Lower): Matsushimawan Group

• Sedimentary facies: Marine
• Depth of water: Shallow - Bathyal
• Lithofacies: Sandstone, Siltstone
• Lithofacies (Minor): Tuff, Conglomerate
• Lithofacies (Lower, Minor): Andesite, Basalt

• Upper limit: Unconformity (Akiu Formation, Sendai Formation)
• Lower limit: Unconformity (Wariyama Metamorphic Rocks, Granitoids)

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

• Distribution: Sendai city, Miyagi pref.

• Miyamoto et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.27-46 DOI
• Fujiwara et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.96-119 DOI
• Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)