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Hondanigawa Formation
- Volcanic rocks
- Oceanic arc of Paleo-Izu-Bonin arc
- Mountain flank deposits of submarine volcanos and volcanic islands on Tanzawa mass
- early - middle Miocene (16.0 - 15.0 Ma)
- Sedimentary facies: Marine
- Metamorphic facies: Prehnite-Pumpellyite
- Lithofacies: Subaqueous volcaniclastics, Subaqueous lavas
- Lithofacies: Basaltic - andesitic hyaloclastite, Epiclastic debrite and turbidite
- Lithofacies (Minor): Basaltic - andesitic lava, Pillow lava
- Thickness: 950 - 1,700 m
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tanzawa mountains, Kanagawa pref.
- Fossils: Corals, Nautilus, Calcareous algae, Foraminifera
- Ishikawa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.291-304, DOI
- Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
- Matsubara and Amano (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.134-150 DOI