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Osawa Formation

Invalid synonym: Osawa Tuff Formation

• Coherent formation
• Oceanic arc of Paleo-Izu-Bonin arc
• Middle Miocene (12.0 - 11.5 Ma)

• Sedimentary facies: Marine
• Metamorphic facies: Prehnite-Pumpellyite
• Lithofacies: Subaqueous volcaniclastics, Subaqueous lavas
• Lithofacies: Epiclastic turbidite, Pumiceous turbidite

• Thickness: 250 - 450 m
• Upper limit: Conformity
• Lower limit: Conformity

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

• Distribution: Tanzawa mountains, Kanagawa pref.

• Ishikawa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.291-304, DOI
• Matsubara and Amano (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.134-150 DOI