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Seto Formation

Invalid synonym: Seto Conglomerate Formation

• Type locality: Seto, Yamakita city, Ashigarakami county, Kanagawa prefecture
• Coherent formation
• Trough-fill sediments between the plate of Honshu side and the Izu block,, an island arc - island arc collision zone

• Sedimentary facies: Marine
• Sedimentary facies: Submarine fan at the continental slope
• Lithofacies (Main): Conglomerate-dominant interbedded conglomerate and sandstone with Few gravels of plutonic rocks
• Lithofacies (Minor): Andesitic tuff (Fresh one and altered one), Interbedded sandstone and mudstone
• Sedimentary structures: Cross-stratification

• Thickness: ca. 1,500 m
• Upper limit: Unconformity (Old Somma Deposits of Hakone volcano)
• Lower limit: Partly fault (Hinata Formation)

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

• Distribution: Seto - Hirayama, Yamakita city, Ashigarakami county, Kanagawa pref.

• Ishikawa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.291-304, DOI
• Odawara et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.135-152 DOI
• Tanikawa and Shimamoto (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.27-32 DOI