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Unit IV

• Accretionary complex
• Deposition (Chert): Middle Triassic - Middle Jurassic (Radiolarians, Conodonts)
• Deposition (Siliceous shale): Middle Jurassic (Radiolarians, Conodonts)
• Deposition (Sandstone): Late Jurassic (Radiolarians, Conodonts)
• Correlation: Togano Unit

• Sedimentary facies: Marine
• Lithofacies: Coherent facies (Chert-clastic sequence)
• Lithofacies (Upper, Main): Sandstone
• Lithofacies (Middle, Main): Siliceous shale
• Lithofacies (Lower, Main): Chert
• Lithofacies (Minor): Interbedded sandstone and shale, Basalts

• Thickness (Sandstone): 370 m
• Thickness (Siliceous shale): A few - 45 m
• Thickness (Chert): 50 m or thicker
• Upper limit: Thrust fault, Conformity (Ebirase Formation)
• Lower limit: Thrust fault (Oteno Fault, Utsutsu Fault)

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

• Distribution: Hiate Kuma city, Kumamoto pref.; Nabewari pass - Akamatsu pass, Kuma city, Kumamoto pref.; Tomochi, Misato city, Kumamoto pref.
• Fossils: Radiolarians, Conodonts

• Onoue and Nishizono (2014) Jour. Geol. Soc. Japan, vol.120, Supplement, pp.1-17 DOI