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South Unit
- High P/T metamorphic rocks
- Protolith: Northern Shimanto Belt
- Deposition: Late Cretaceous, Cenomanian - Campanian (95 - 82 Ma)
- Metamorphism: Late Cretaceous (83.9 - 69.8 Ma, K-Ar)
- Metamorphic zones: Garnet zone
- Lithofacies: Pelitic schist, Greenschist
- Lithofacies (Minor): Amphibolite
------ 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
- Otoh et al. (2010) Jour. Geol. Soc. Japan, vol.119, No.2, pp.333-346 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.)