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Shiroyama Formation
- Coherent formation
- Izumi sedimentary basin
- Forearc basin associated with strike-slip fault related to Median Tectonic Line
- Late Cretaceous, Campanian (Ammonoids, Paleomagnetism)
- Sedimentary facies: Northern margin of the sedimentary basin
- Sedimentary facies: non-Turbidite
- Sedimentary facies: Fluvial - Brackish - Shallow marine
- Sedimentary facies (Upper): Upper shoreface
- Sedimentary facies (Main): Estuary (Muddy tidal flat)
- Sedimentary facies (Main): Estuary (Sandy tidal flat)
- Sedimentary facies (Lower): Fluvial
- Lithofacies: Sandstone, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Doki river, Manno city, Nakatado county, Kagawa pref.; Kanewari, Sanuki city, Kagawa pref.
- Fossils: Crassostrea sp., Brachidontes nankoi, Eriphyla sp., Loxo sp.
- Yoshikawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.9, pp.523-537 DOI