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Shiohama Formation
- Coherent formation
- Early Cretaceous
- Sedimentary facies: Terrestrial
- Sedimentary facies: Alluvial fan
- Sedimentary facies (Upper): Mid-fan of alluvial fan
- Sedimentary facies (Middle): Mid-fan of alluvial fan - Upper stream
- Sedimentary facies (Lower): Fan toe of alluvial fan or floodplain
- Climate: Semi dry - semi humid associated with rainy seasons and dry seasons
- Climate: 100 - 700 mm annual average precipitation
- Lithofacies: Interbedded volcanic conglomerate, shale and sandstone
- Lithofacies (Upper): Gravelly sandstone
- Lithofacies (Middle): Conglomerate
- Lithofacies (Middle, Minor): Sandstone, Mudstone
- Lithofacies (Lower): Interbedded conglomerate, sandstone and mudstone
- Distribution: Toyonishi - Utsui, Shimonoseki city, Yamaguchi pref.; Cape Ajironohana, Yoshimi, Nagatahonmachi town, Shimonoseki city, Yamaguchi pref.
- Horiuchi and Hisada (2008) Jour. Geol. Soc. Japan, vol.114, no.9, pp.447-460 DOI