[ Top ] [ Japanese ]

Acchiyama volcano Isshiki, 1987

Invalid synonym: Awaiura Formation, Acchiyama Lava

• Type locality: Mount Acchiyama, Niijima island, Niijima city, Tokyo
• Volcanic rocks
• Monogenetic volcano
• Holocene (ca. 1,600 yBP)

• Sedimentary facies: Lava dome, Pyroclastic cone, Pyroclastic surge deposit
• Lithofacies: Biotite rhyolite volcanic ash, Lapilli, Lava
• Sedimentary structures: Cross stratification

• Distribution (South - North): 1.3 km
• Distribution (East - West): 1.1 km
• Distribution (Height): ca. 150 m
• Lower limit: Unconformity (Hatashironohana volcano, Wakago volcano)

• Distribution: Mount Acchiyama, 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.)