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Higashiomata Formation Yamamoto and Yoshioka, 1992

Invalid synonym: Kannon Formation, Ogino Formation, Kamimiyori Formation, Omogawa Formation, Tanaka Formation, Hongo Formation, Bokujo Formation, Futamatagawa Formation, Oiwa Formation

• Type locality: Higashiomata - Shobusawa, Aizumisato city, Onuma county, Fukushima prefecture
• Volcanic rocks
• Eruption center faceis of Felsic volcanic activities
• Lava domes
• early - middle Miocene (Microfossils)
• Contemporaneous heterotopic facies: Takizawagawa Formation
• Correlation: Hibara Formation, Kuroiwa Formation, Gomaizawa Formation, Hiyama Formation, Okubo Formation, Oshio Formation, Ogawazawa Formation
• Intruded by: Orthopyroxene clinopyroxene andesite, Basalt, Rhyolite dykes

• Sedimentary facies: Marine
• Sedimentary facies: Gravity flow deposit
• Sedimentary facies (Minor): Shallow water phreatomagmatic eruption
• Lithofacies: Rhyolite lava, Volcanic breccia, Tuff breccia, Lapilli tuff, Volcanic sandstone, Tuff
• Lithofacies (Minor): Sandstone, Mudstone, Basalt scoriaceous lapillistone, Accretionary lapilli tuff, Volcanic sandstone
• Sedimentary structures (Sandstone): Parallel stratification, Bioturbation

• Thickness: 1,500 m
• Upper limit: Conformity (Ninosawa Formation), Unconformity (Sunagohara Formation, Nanaorezaka Formation, Lower I Terrace Deposit), Abut unconformity (Iriyamazawa Formation, Takagawa Formation, Hiwada Formation)
• Lower limit: Conformity (Kurakawa Formation), Unconformity (Late Cretaceous granodiorite)

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

• Distribution: Higashiomata - Shobusawa, Aizumisato city, Onuma county, Fukushima pref.; Ichino, Aizutakada city, Onuma county, Fukushima pref.
• Fossils: Shellfishes, Foraminifera

• Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
• Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
• Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)
• Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)
• Yamamoto and Yoshioka (1992) Geology of the Wakamatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)