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Takadate Formation (Inai, 1939)

Invalid synonym: Takadate Group, Takadate Volcanic Rocks, Takadate Andesite, Natorigawa Andesite Group, Natorigawa Andesite

• Type locality: Natori river, Kumanodo, Takadate, Natori city - Minamiakaishi, Sendai city, Miyagi prefecture
• Volcanic rocks
• early Miocene (22.0 - 12.6 Ma, K-Ar; 18.4, 18.3 Ma, FT)
• Correlation: Nonodake Pyroclastic Member
• Intruded by: Andesite

• Sedimentary facies: Terrestrial
• Sedimentary facies (Lower): Shallow marine
• Sedimentary facies: Pigeonite series (= Tholeiite)
• Lithofacies: Andesite - Basalt lava, Volcanic breccia, Agglomerate, Tuff breccia, Pumice tuff
• Lithofacies (Lower, Minor): Siltstone

• Source: Fractures of Wariyama uplift zone
• Thickness: 60 - 250 m in maximum
• Upper limit: Unconformity, partly interfingered (Moniwa Formation), Unconformity (Yumoto Formation, Nashino Formation, Yamairi Formation, Kameoka Formation), Abut unconformity (Dainenji Formation)
• Lower limit: Interfingered (Tsukinoki Formation), Abut unconformity (Basement)

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

• Distribution: Natori river, Kumanodo, Takadate, Natori city - Minamiakaishi, Sendai city, Miyagi pref.; Kasajima, Natori city, Miyagi pref.; Mount Ueno - Mount Shiho, Shibata city, Shibata county, 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.)
• Oide and Fujita (1975) Geology of the Iwanuma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)