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Mitaki Formation (Yabe, 1926) Okutsu, 1967

Invalid synonym: Mitaki Basalt, Mitaki Andesite, Mitaki Tholeiite, Banzan Andesite

• Type locality: Mitaki hot spring, Ishiyama, Aoba ward, Sendai city, Miyagi prefecture
• Volcanic rocks
• late Miocene (8.2 - 7.7 Ma, K-Ar)
• Contemporaneous heterotopic facies: Shirasawa Formation

• Sedimentary facies: Terrestrial
• Sedimentary facies: Tholeiite series, Reductive
• Lithofacies: Basaltic andesite - Basalt lava, Volcanic breccia, Tuff breccia
• Lithofacies (Minor): Tuff

• Source: Mount Banzan, Mount Gongenmori
• Thickness: 200 m or thicker
• Upper limit: Abut unconformity (Kameoka Formation, Mukaiyama Formation, Hirosegawa Tuff Member, Dainenji Formation)
• Lower limit: Partly interfingered (Nashino Formation), Unconformity (Tsunaki Formation)

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

• Distribution: Mitaki hot spring - Mount Naraibanzan - Gongenmori - Hachiman, Aoba-ku, 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.)