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Uzuka Basalt Kaneko and Chiba, 1998

• Type locality: Uzuka, Nakanoshima island, Ama city, Oki county, Shimane prefecture
• Volcanic rocks
• Pliocene (2.8 Ma, K-Ar)

• Lithofacies: Alkaline olivine basalt lava
• Lithofacies (Minor): Lithic tuff, Diatomite

• Source: Akiya Scoria Cone
• Mode of eruption: Phreatomagmatic
• Thickness: 50 m or thicker
• Lower limit: Abut unconformity (upper Somma)

• Distribution: Akiya seashore - Uzuka - Suwa bay - Sakaiguri, Nakanoshima island, Ama city, Oki county, Shimane pref.
• Fossils (Diatoms): Actinocyclus ingens f. ingens, Actinocyclus ingens f. planus, Cavitatus jouseanus, Thalassionema nitzschioides

• Chiba et al. (2000) Geology of the Urago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 3p.)