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Kitahikoshima Formation
- Volcanic rocks
- Early Cretaceous (106.7, 105.2 Ma, K-Ar; 115.4 Ma, FT)
- Sedimentary facies: Terrestrial
- Lithofacies: Andesite, Andesitic tuff, Tuffaceous sandstone, Shale
- Distribution: Toyonishi - Utsui, Shimonoseki city, Yamaguchi pref.
- Horiuchi and Hisada (2008) Jour. Geol. Soc. Japan, vol.114, no.9, pp.447-460 DOI