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Main facies

• Coherent formation
• Izumi sedimentary basin
• Forearc basin associated with strike-slip fault related to Median Tectonic Line
• Late Cretaceous, early Maastrichtian
• Contemporaneous heterotopic facies (Partly): Northern marginal facies, Mutsuo Formation

• Sedimentary facies: Main filling of the sedimentary basin
• Lithofacies: Interbedded turbidite and mudstone
• Lithofacies: Interbedded sandstone and conglomerate, Interbedded sandstone and mudstone
• Lithofacies (Minor): Felsic tuff

• Lower limit: Transitional, Interfingered (Northern marginal facies)

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

• Distribution: Izumi mountains, Osaka pref., Asan mountains, Tokushima pref.; Niihama region, Ehime pref.
• Fossils (Trace fossils): Archaeozostera isp.

• Seike et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.12, pp.759-775 DOI
• Kikuchi and Kotake (2013) Jour. Geol. Soc. Japan, vol.119, no.9, pp.613-629 DOI
• Seike and Hirano (2013) Jour. Geol. Soc. Japan, vol.119, no.6, pp.397-409 DOI
• Miyata et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.37-52 DOI
• Yoshikawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.9, pp.523-537 DOI
• Noda et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.2, pp.99-113 DOI