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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
- Sedimentary facies: Turbidite
- Lithofacies: Interbedded sandstone and conglomerate, Interbedded sandstone and mudstone
- Lithofacies (Minor): Felsic tuff
- Sedimentary structures: Flute marks, Groove marks
- Paleocurrent (Longitudinal): from East-northeast to West-southwest
- Paleocurrent (Lateral): from North to South, from Northwest to Southeast
------ 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.
- Noda et al. (2017) Geology of the Kan-onji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 96p. (in Japanese with English abstract 4p.)
- 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
- Makimoto et al. (2004) Geology of the Kokawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 89p. (in Japanese with English abstract 4p.)
- Miyata et al. (1993) Geology of the Wakayama and Ozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
- Takahashi et al. (1992) Geology of the Sumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 5p.)
- Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)