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Mushikawa Formation (Ujihara, 1985) Nagamori et al., 2010

Invalid synonym: Mushikawa Complex, Mushikawa Olistostrome

• Accretionary complex, Ophiolite
• middle Permian (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies (Upper): Breccia, Sandstone
• Lithofacies (Lower): Mudstone
• Lithofacies (Lower, Minor): Sandstone
• Sedimentary structures (Lower, Minor): Graded bedding

• Thickness: 600 m or thicker
• Upper limit: Unconformity (Imai Formation)

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

• Distribution: Yamanaka - Kuratani, Itoigawa city, Niigata pref.
• Fossils (Radiolarians): Albaillella asymmetrica, Pseudoalbaillella aff. longicornis, Pseudoalbaillella fusiformis, Pseudoalbaillella longtanensis

• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)
• 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