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Nibutani Formation

• Coherent formation
• Foreland basins by collision between northeast Japan island arc and Kuril island arc
• middle - late Miocene (13.0 - 11.5 Ma, Diatoms)

• Sedimentary facies: Pro fan delta
• Sedimentary facies: Submarine canyon fill deposit
• Lithofacies: Sandy and gravelly turbidite associated with conglomerate, Silty turbidite
• Lithofacies: Sandy conglomerate, Interbedded sandstone and conglomerate, Sandstone-dominant interbedded sandstone and mudstone, Mudstone, Siliceous mudstone
• Sedimentary structures: Cross stratification
• Paleocurrent: South

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

• Distribution: Abetsu river, Kobira, Biratori city, Saru county, Hokkaido

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