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Shimawakezawa Volcaniclastic Deposits Isshiki, 1987

Invalid synonym: Shimawakezawa Tuff

• Type locality: Shimawakezawa? creek, Niijima island, Niijima city, Tokyo
• Volcanic rocks
• Pleistocene
• Correlation: upper Jinaijima volcano

• Lithofacies: Bronzite augite andesite volcanic ash, Lapilli

• Thickness: ca. 50 m
• Upper limit: Unconformity (Akazakinomine volcano, Minejiyama volcano)
• Lower limit: Unconformity (Oiso volcano)

• Distribution: Shimawakezawa? creek - Oiso - Takane - Mount Ogiyama, Niijima island, Niijima city, Tokyo

• Isshiki (1987) Geology of the Nii Jima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 3p.)