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Kussaki Formation Noda et al., 2010

• Type locality: Kussaki, Go, Niihama city, Ehime prefecture
• Coherent formation
• Izumi sedimentary basin
• Forearc basin associated with strike-slip fault related to Median Tectonic Line
• Late Cretaceous, early - middle Campanian (Radiolarians, Ammonoids, Inoceramus sp.)

• Sedimentary facies: Northern margin of the sedimentary basin
• Sedimentary facies: non-Turbidite
• Lithofacies: Mudstone, Interbedded mudstone and sandstone
• Lithofacies (Minor): Conglomerate, Sandstone

• Thickness: 30 m or thicker
• Upper limit: Bottom of the sandstone-dominant horizon
• Upper limit: Transitional or Interfingered (Isoura Formation, Niihama Formaiton), Unconformity (Neogene sand and gravel bed)
• Lower limit: Unconformity (Ryoke Granitoids)

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

• Distribution: Kussaki - Hoshigoe - Oji - Isoura - Ashima, Niihama city, Ehime pref.; Ikenotani, Doi village, Shikokuchuo city, Ehime pref.
• Fossils: Echinoids, Trace fossils
• Fossils (Bivalves): Acila (Truncacila) cf. shimojimensis, Glycymeris sp., Inoceramus balticus, Inoceramus cf. schmidti, Nanonavis sp., Pseudogrammatodon sp.
• Fossils (Ammonoids): Baculites cf. occidentalis, Bevahites aff. lapparenti, Delawarella sp., Submortoniceras sp.
• Fossils (Radiolarians): Amphipyndax stocki, Archaeospongoprunum andersoni, Archaeospongoprunum hueyi, Crucella sp., Neosciadiocapsa sp., Orbiculiforma sp., Pseudoaulophacus floresensis, Triactinosphaera sp.

• Aoya et al. (2013) Geology of the Niihama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 181p. (in Japanese with English abstract 3p.)
• Noda et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.2, pp.99-113 DOI