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Otaki Group (Fujimoto et al., 1950) Hara and Hisada, 1998

• Type locality: Otaki, Chichibu city, Saitama prefecture
• High P/T metamorphic rocks
• Accretionary complex
• Accretion: Early - Late Cretaceous (ca. 105 - 75Ma)?
• Metamorphism: Late Cretaceous (ca. 75 - 65 Ma, K-Ar)

• Sedimentary facies: Marine
• Metamorphic facies: Greenschist (270 MPa, 300 degree C)
• Lithofacies: Mélange facies
• Lithofacies: Phyllite, Sandstone, Tuff
• Exotic blocks (Crusts): Basalt, Chert, Limestone

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

• Distribution: Otaki, Chichibu city, Saitama pref.

• Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Hara et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.73-76 DOI