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Hiwadatoge Formation

Invalid synonym: Hiwadatoge Granule Conglomerate Member

• Coherent formation
• early Eocene (50 Ma or later)

• Sedimentary facies: Marine
• Sedimentary facies: Slope progradating fan-delta
• Depth of water: Shallow
• Lithofacies: Conglomerate, Sandstone

• Thickness: Tens of - 100 m
• Upper limit: Unknown (Furuiwaya Formation)
• Lower limit: Unknown (Sanbagawa Metamorphic Rocks)

• Distribution: Hiwada pass - Sangonotsuji, Hiwada, Kumakogen city, Ehime pref.; Nimyo, Kumakogen city, Kamiukena county, Ehime pref.
• Fossils: Sharks (Teeth), Bivalves, Gastropods, Brachiopods, Foraminifera, Dinofloagellates
• Fossils (Gravels in Furuiwaya Formation): Bivalves (Ostrea), Limpets, Bryozoa, Corals, Sponges

• Nakata et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.6, pp.447-452 DOI
• Nara et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.471-489 DOI
• Ikeda et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.445-470 DOI
• Ochi et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.5, pp.165-179 DOI