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Gandoya Tuff Breccia

• Type locality: Gandoya, Tsuyama city, Okayama prefecture
• Volcanic rocks
• Mesozoic

• Lithofacies: Holnfels
• Lithofacies (Protolith): Tuff breccia

• Lower limit: Unconformity (Sangun Metamorphic Rocks)

• Distribution: Gandoya - Oso, Tsuyama city, Okayama pref.

• Yamada (1966) Chizu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 11p.)