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Tsuno Group Kojima et al., 1951
- High P/T metamorphic rocks
- Metamorphism: early Carboniferous - Late Jurassic (224, 216 Ma, Rb-Sr; 175, 172 Ma, K-Ar)
- Intruded by: Hiroshima Granites
- Metamorphic facies: Pumpellyite-Actinolite, Blueschist
- Lithofacies (Upper): Pelitic schist
- Lithofacies (Upper, Minor): Mafic schist, Ultramafic rocks
- Lithofacies (Lower): Pelitic schist
- Lithofacies (Lower, Minor): Psammitic schist
- Distribution: Nishiki town - Ikimigawa river - Hongogawa river - Mount Hokkesan - Sugawa - Sasanoore pass - Shinmeibara - Mount Rakansan, Iwakuni city, Yamaguchi pref.; Tokuyama city, Yamaguchi pref; Kano town, Shunan city, Yamaguchi pref.; Onoda city, Yamaguchi pref.; Mount Oniishiyama, Hatsukaichi city, Hiroshima pref.
- Takahashi et al. (1989) Geology of the Tsuda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 56p. (in Japanese with English abstract 4p.)