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Monzen Formation Fujioka, 1959

Invalid synonym: Nishioga Formation, Tatejima Conglomerate Member (Daijima area)

• Type locality: Monzen, Honzan, Funagawaminato - Akashima, Toga, Oga city, Akita prefecture
• Coherent formation
• Alkaline - alkali-rich calc-alkaline submarine volcano complexes, Scoria cone
• late Eocene (40.4 - 33.9 Ma; 34 - 26 Ma, K-Ar)
• Correlation: Haginari-Okuramatasawa Formation

• Sedimentary facies: Marine
• Depth of water: Shallow (Trace fossils)
• Lithofacies (Upper): Rhyolite
• Lithofacies (Upper): Lava
• Lithofacies (Upper, Minor): Tuffaceous conglomerate, Sandstone, Lapilli tuff
• Lithofacies (Main): Basalt, Dacite
• Lithofacies (Main): Lava (Pillow lava), Pyroclastic rocks (Hyaloclastite)
• Lithofacies (Main, Minor): Tuffaceous sandstone, Siltstone

• Upper: Unconformity (Nishikurosawa Formation, Daijima Formation, Nomuragawa Formation)

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

• Distribution: Cape Shiose, Kohama, Funagawaminato, Oga city, Akita pref.; Monzen, Honzan, Funagawaminato - Akashima, Toga, Oga city, Akita pref; Cape Daimyojin, Nishikurosawa, Kitaura, Oga city, Akita pref.; Ogayama pasture, Kitaura, Oga city, Akita pref.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Kano et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.6, pp.351-364 DOI
• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI
• Sato et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.1, pp.31-46 DOI