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Main stratovolcano
- Type locality: Toshima city, Tokyo
- Volcanic rocks
- Pleistocene - Holocene
- Intruded by: Basalt dikes (15 dikes)
- Sedimentary facies: Stratovolcano
- Lithofacies: Low-alkaline tholeiite
- Lithofacies: Augite olivine basalt
- Lithofacies (Top): Loam
- Lithofacies: Aa lava (A few dozen flow units)
- Lithofacies (Minor): Scoriaceous basalt volcanic ash
- Source: center of Toshima island
- Volume: 0.678 km3
- Thickness (A unit): Several m or thinner
- Thickness (Volcanic ash): A few dozen cm
- Thickness (Dyks): 1 - 5 m wide
- Top: Unconformity (Volcaniclastic deposits)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Toshima city, Tokyo
- Isshiki (1978) Geology of the Toshima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 2p.)