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Kuzu Complex, Unit 1
Invalid synonym: Tochigi Group, Awano Group, Ohirayama Formation, Osawa Formation, Iwade Formation, Nakayama Formation, Hiroto Formation, Nakatsuma Formation, Aizawa Formation
- Type locality: Tochigi prefecture
- Accretionary complex
- Deposition (Siliceous claystone): Early Triassic (Conodonts, Radiolarians)
- Deposition (Chert): Triassic, Jurassic (Conodonts, Radiolarians)
- Deposition (Siliceous mudstone): Middle Jurassic, Bajocian - early Bathonian; Middle Jurassic, late Callovian - Late Jurassic, Oxfordian (Radiolarians)
- Deposition (Mudstone): Middle Jurassic, Bajocian - early Bathonian; Middle Jurassic, late Callovian - Late Jurassic, Oxfordian (Radiolarians)
- Accretion: Late Jurassic
- Correlation: Kamiaso Formation, Tochigi Complex
- Sedimentary facies: Marine
- Lithofacies: Coherent facies (Chert-clastic sequence)
- Lithofacies (Top): Sandstone
- Lithofacies (Upper): Interbedded sandstone and mudstone
- Lithofacies (Middle): Mudstone
- Lithofacies (Lower middle): Siliceous mudstone
- Lithofacies (Lower): Chert
- Lithofacies (Bottom): Siliceous claystone
- Upper limit: Thrust fault
- Lower limit: Thrust fault
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Shiota, Hikoma town, Sano city, Tochigi pref.
- Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
- Fujimoto (1961) Tochigi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 6p.)
- Kawata and Ozawa (1955) Ashio, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 7p.)