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Tochigi Complex (Fujimoto, 1961) Yoshikawa et al., 2010

Invalid synonym: Tochigi Group

• Type locality: Tochigi city - Kuzuu, Sano city, Tochigi prefecture
• Accretionary complex
• Deposition (Chert): Triassic, Ladinian - Jurassic, Bathonian
• Deposition (Siliceous mudstone): Jurassic, Bajocian - Callovian
• Deposition (Interbedded sandstone and mudstone): Jurassic, Bathonian - Callovian
• Deposition (Silty mudstone): Jurassic, Callovian - Oxfordian
• Accretion: Late Jurassic, Oxfordian
• Correlation: Kuzuu Group, Unit 1 of Kuzu Complex, Sano Group
• Intruded by: Granite

• Sedimentary facies: Marine
• Lithofacies: Coherent facies (2 Chert-clastic sequences)
• Lithofaceis: Chert, Siliceous mudstone, Mudstone, Sandstone, Interbedded sandstone and mudstone

• Thickness (A sequence): ca. 500 - 600 m
• Thickness (Chert): ca. 250 m
• Thickness (Siliceous mudstone): ca. 0 - 50 m
• Thickness (Mudstone): ca. 50 - 170 m
• Thickness (Interbedded sandstone and mudstone): ca. 0 - 200 m or thicker
• Upper limit: Unconformity (Welded tuff, Lapilli tuff, Myogazawa Formation)

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

• Distribution: Tochigi city - Kuzuu, Sano city, Tochigi pref.; Mount Kogashi - Mount Kurakake - Mount Akaiwa, Utsunomiya city, Tochigi pref.; Kikusawa hills - Tochikubo - Sento, Kanuma city, Tochigi pref.; Choka - Inokura, Nikko city, Tochigi pref.

• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)