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221m-yama volcano Isshiki, 1982

Invalid synonym: Awanomikoto Lava Dome

• Type locality: 221 m above sea level, ca. 0.7 km south of Mount Kobeyama, Kozushima city, Tokyo
• Volcanic rocks
• Monogenetic volcano
• Pleistocene

• Sedimentary facies: Lava dome
• Lithofacies: Rhyolite lava

• Distribution (Diameter): ca. 500 m
• Thickness: ca. 50 m
• Upper limit: Unconformity (Chichibuyama Pyroclastic Deposits)

• Distribution: 221 m above sea level, ca. 0.7 km south of Mount Kobeyama, 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.)