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Chichibuyama Pyroclastic Deposits (Tsuya, 1929) Isshiki, 1982

Invalid synonym: Chichibu-yama ejecgta-bed

• Type locality: Kozushima city, Tokyo
• Volcanic rocks
• Pleistocene - Holocene

• Sedimentary facies: Pyroclastic fall deposit, Pyroclastic flow deposit
• Lithofacies: Biotite rhyolite pyroclastic surge deposit
• Sedimentary structures: Cross stratification

• Source: Monogenetic volcanos in Kozushima island
• Upper limit: Unconformity (Hashiruma volcano, Nachisan volcano, Jogoyama volcano)
• Lower limit: Unconformity (Nagahama volcano, Kannonura volcano, Hashiruma volcano, 221m-yama volcano, Nachisan volcano, Matsuyamabana volcano)

• Distribution: Menbo - Mount Takadokoroyama - Sawajiri bay, Kozushima city, Tokyo

• Isshiki (1982) Geology of the Kozushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 3p.)