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Kuchiwa Diorites (Yoshida, 1961) Matsuura, 1990

• Type locality: Shimokuchiwa, Onan city, Ochi county, Shimane prefecture
• Plutonic rocks
• Eocene (49.3 Ma, K-Ar)
• Intruded in: Hasumi Formation, Sakugi Volcanic Rocks

• Lithofacies: Orthopyroxene-bearing clinopyroxene hornblende diorite, Hornblende tonalite, Hornblende biotite granodiorite, Granodiorite porphyry, Granophyre, Diorite porphyry

• Distribution (East - West): ca. 7 km
• Distribution (South - North): ca. 3 km

• Distribution: Shimokuchiwa - Ueda - Doi - Togochidao pass, Onan city, Ochi county, Shimane pref.

• Matsuura (1990) Geology of the Akana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)