Kussaki Formation

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

Thickness: 30 m or thicker
Upper limit: Transitional or Interfingered (Isoura Formation, Niihama Formaiton), Unconformity (Neogene sand and gravel bed)
Lower limit: Unconformity (Ryoke Granitoids), Fault (Ryoke Granitoids)

Northern marginal facies (Niihama region)
[ Upper ]
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Kussaki Formation
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[ Lower ]

Izumi Group
[ North ]
~~~~~~~~~~~~~~
Northern marginal facies
Main facies
Southern facies
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[ South ]

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

Distribution: Kussaki, Go, Niihama city, Ehime pref.; Hoshigoe - Oji - Isoura - Ashima, Niihama city, Ehime pref.; Ikenotani, Doi village, Shikokuchuo city, Ehime pref.
Fossils: Echinoids, Trace fossils
Fossils (Bivalves): Inoceramus sp., Inoceramus balticus, Inoceramus cf. schmidti, Nanonavis sp., Pseudogrammatodon sp., Acila sp., Glycymeris sp.
Fossils (Ammonoids): Delawarella sp., Bevahites aff. lapparenti, Submortoniceras sp., Baculites cf. occidentalis

Noda et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.2, pp.99-113 DOI