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Nina Formation

• Coherent formation
• Foreland basins by collision between northeast Japan island arc and Kuril island arc
• late Miocene - Pliocene (Diatoms)

• Sedimentary facies: Fan delta front
• Sedimentary facies (Lower): Shoot and Levee
• Depth of water: Continental shelf
• Lithofacies: Turbidite
• Lithofacies: Siltstone, Mudstone, Interbedded turbidite sandstone and siliceous siltstone
• Lithofacies (Minor): Sandstone, Conglomerate
• Sedimentary structures: High angle foreset cross stratification
• Paleocurrent: Southwest

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

• Distribution: Asahioka, Mukawa city, Yufutsu county, Hokkaido; Midorimachi, Hidaka city, Hidaka county, Hokkaido

• Kase et al., (2018) Jour. Geol. Soc. Japan, vol.124, no.8, pp.627-642 DOI