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North Unit

Invalid synonym: Lower group

• High P/T metamorphic rocks
• Metamorphism: late Paleogene (64.3 - 59.2 Ma, K-Ar)
• Metamorphic zones: Biotite zone

• Lithofacies: Spotted greenschist, Spotted quartz schist

• Thickness: 180 m or thicker
• Upper limit: Thrust (Middle Unit)
• Lower limit: Thrust

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

• Distribution: Ayukawa - Sanbagawa, Fujioka city, Gunma pref.

• Takagi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.305-324, DOI
• Arai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.223-241 DOI
• Okubo and Horiguchi (1969) Geology of the Mamba District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)