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Futase Unit (Watabe et al., 1958) Hara and Hisada, 1998

Invalid synonym: Futase Formation

• Type locality: Futase, Otaki, Chichibu city, Saitama prefecture
• Accretionary complex
• Accretion: Cretaceous

• Sedimentary facies: Marine
• Metamorphic facies: Greenschist (270 MPa, 300 degree C)
• Lithofacies: Sandstone, Interbedded sandstone and phyllite, Tuffaceous phyllite, Broken facies
• Lithofacies (Minor): Mélange facies, Basalt lava, Volcaniclastic rocks, Tuff, Limestone, Chert

• Lower limit: Thrust fault (Kawamata Unit)

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

• Distribution: Futase - Misoba - Kamioka - Lake Chichibu - Tochimoto - Oyokezawa creek - Miyadaira - Kozori - Hamadaira, 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.)