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Susugaya Subgroup
- Volcanic rocks
- Oceanic arc of Paleo-Izu-Bonin arc
- Mountain flank deposits of submarine volcanos and volcanic islands on Tanzawa mass
- Middle Miocene (13.5 - ? Ma, Calcareous nannofossils)
- Sedimentary facies: Marine
- Metamorphic facies: Prehnite-Pumpellyite
- Lithofacies: Subaqueous volcaniclastics, Subaqueous lavas
- Thickness: 650 - 1,800 m
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tanzawa mountains, Kanagawa pref.
- 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.)
- Oka et al. (1979) Geology of the Fujisawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 5p.)