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Daisanyama Volcaniclastic Deposits Isshiki, 1987

• Type locality: Mount Daisanyama, Niijima island, Niijima city, Tokyo
• Volcanic rocks
• Pleistocene

• Lithofacies: Cummingtonite rhyolite volcanic ash, Lapilli, Volcanic breccia
• Sedimentary structures: Cross stratification

• Thickness: ca. 3 - 20 m
• Upper limit: Unconformity (Mukaiyama volcano)
• Lower limit: Unconformity (Setoyama volcano)

• Distribution: Mount Daisanyama - Mount Setoyama - Kurone harbour - Torigashima island, 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.)