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West Unit

• Accretionary complex
• Deposition (Chert): middle Permian (Radiolarians)
• Deposition (Siliceous mudstone): middle Permian (Radiolarians)
• Accretion: middle Permian (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies: Coherent facies (Chert-clastic sequence)
• Lithofacies (Top): Sandstone
• Lithofacies (Upper): Interbedded mudstone and tuffaceous siltstone
• Lithofacies (Upper middle): Interbedded felsic tuff and mudstone
• Lithofacies (Middle): Siliceous mudstone
• Lithofacies (Lower middle): Interbedded chert and siliceous tuff
• Lithofacies (Lower): Chert
• Lithofacies (Bottom): Mudstone
• Sedimentary structures (Sandstone): Graded bedding

• Thickness: 600 m or thicker
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Itoigawa city, Niigata pref.
• Fossils: Radiolarians

• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Takeuchi et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.123-142 DOI