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Sengoku Formation

• Coherent formation
• Early Cretaceous

• Sedimentary facies: Lacustrine
• Lithofacies: Interbedded mudstone and sandstone

• Upper limit: Unconformity (Nyoraida Formation)
• Lower limit: Unconformity

• Distribution: Otaraguchi, Miyawaka city, Fukuoka pref.
• Fossils: Gastropods (Brotiopsis wakinoensis ryohoriensis)

• Ota et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.5, pp.289-298 DOI