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Akiu Group
- Coherent formation
- Paleo-Sendai Lake sediments
- late Miocene (8.0 - 6.0 Ma)
- Sedimentary facies: Terrestrial, Lacustrine
- Sedimentary facies: Pyroclastic flow, Caldera lake
- Lithofacies: Volcanic rocks, Volcaniclastic rocks
------ 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.)