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Hashirajima Granite
- Plutonic rocks
- Late Cretaceus
- Younger Ryoke Granitoids (Hashirajima island, Yamaguchi pref.)
- [ Young ]
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- Hashirajima Granite
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- [ Old ]
------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hashirajima island - Nakakojima island - Teshima island - Kohashirajima island, Iwakuni city, Yamaguchi pref.
- Matsuura (1997) Geology of the Kurahashi Jima and Hashira Jima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 4p.)