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Gyojanoiwaya volcano Isshiki, 1984

• Type locality: Gyojanoiwaya, Oshima city, Tokyo prefecture
• Volcanic rocks
• Stratovolcano
• Pleistocene (younger than Fudeshima volcano?)

• Lithofacies: Low-alkaline tholeiite series
• Lithofacies: Augite hypersthene basalt lava (more than 3 flow units)
• Lithofacies (Minor): Scoria fall deposit

• Thickness (A unit): 20 - 30 m
• Upper limit: Unconformity (Older edifice)

• Distribution: central part of east coast of Izu-Oshima island
• Distribution: Gyojanoiwaya - Cape Naganemisaki, Oshima city, Tokyo

• Isshiki (1984) Geology of the Oshima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 133p. (in Japanese with English abstract 5p.)