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Himenoura Group (Nagao, 1922)

• Type locality: Himenoura, Himedo village, Kamiamakusa city, Kumamoto prefecture
• Coherent formation
• Late Cretaceous, Santonian - Maastrichtian (Inoceramus sp.) - Paleogene?

• Sedimentary facies: Marine, Fluvial
• Depth of water: Shallow
• Depth of water: Subtidal - Tidal zone
• Lithofacies: Mudstone, Sandstone
• Lithofacies (Minor): Conglomerate, Gravel-bearing mudstone, Tuff

• Thickness (Amakusa-Kamishima island): 700 m
• Thickness (Koshikijima islands): 1,300 m or thicker
• Upper limit: Unconformity (Kamikoshikiijma Group)

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

• Distribution: Himenoura, Himedo village, Kamiamakusa city, Kumamoto pref.; Kamikoshikijima island - Nakakoshikijima island - Shimokoshikijima island, Koshikijima islands, Satsumasendai city, Kagoshima pref.
• Fossils: Ammonoids (Glyptoxoceras cf. indicum), Bivalves (Yaadia obsoleta), Gastropods
• Fossils (Inoceramus): Inoceramus orientalis = Sphenoceramus orientalis, Inoceramus balticus toyajoanus, Sphenoceramus schmidti

• Komatsu et al. (2014) Jour. Geol. Soc. Japan, vol.120, Supplement, pp.19-39 DOI
• Aramaki et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.1, pp.45-50 DOI
• Kojo et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.398-416 DOI
• Tonai et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.547-559 DOI