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VIa Zone
- Plutonic rocks
- Cretaceous
- Lithofacies: Plutonic rocks
- VIa Zone
- [ North ]
- ~~~~~~~~~~~~~~
- Ashi-jima Mass
- ~~~~~~~~~~~~~~
- [ South ]
------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kitakami mountains, Iwate pref.
- Nishioka and Yoshikawa (2004) Geology of the Ryori District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 49p. (in Japanese with English abstract 3p.)
- Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)