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Hyotanyama Parasitic Cone Tsuya, 1940

• Volcanic rocks
• Holocene (July 12th at night - 13th, 1940)

• Lithofacies: Tholeiite series
• Lithofacies: Basalt scoria, Volcanic bomb

• Distribution (Length, just after forming): ca. 900 m
• Distribution (Length, present): ca. 500 m
• Distribution (Width): ca. 400 m

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Mount Hyotan, Miyake city, Tokyo

• Isshiki (1960) Miyake-jima, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 5p.)