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Youra Unit

Invalid synonym: Shakumasan Group

• Type locality: Youra, Tsukumi city, Oita prefecture
• Accretionary complex
• Deposition (Terrigenous clastic rocks): Middle - Late Jurassic
• Deposition (Siliceous mudstone): Early - Late Jurassic
• Deposition (Chert): Middle Triassic - Middle Jurassic
• Deposition (Siliceous clay stone): Early Triassic
• Correlation: Togano Unit

• Sedimentary facies: Marine
• Sedimentary facies: Pelagic, ocean bottom sediment, Trough-fill sediment
• Lithofacies: Coherent facies (Chert-clastic sequence)
• Lithofacies: Siliceous clay stone, Chert, Siliceous mudstone, Terrigenous clastic rocks

• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Youra, Tsukumi city, Oita pref.; Ajiro island, Tsukumi city, Oita pref.

• Tomimatsu et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.267-273, DOI
• Soda et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.4, pp.147-152, DOI