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Tanzawa Group (Watabe et al., 1952) Takahashi, 2008

Hayato Group had been a member of Tanzawa Group but it was separated.

• Volcanic rocks
• Oceanic arc of Paleo-Izu-Bonin arc
• Mountain flank deposits of submarine volcanos and volcanic islands on Tanzawa mass
• Early Miocene - early Pliocene
• Contemporaneous heterotopic facies: Nishiyatsushiro Group

• Sedimentary facies: Shallow marine
• Sedimentary facies: vicinity of a volcanic front
• Metamorphic facies: Prehnite-Pumpellyite
• Lithofacies: Tholeiitic basalt - Andesite, Dacite
• Lithofacies: Volcaniclastic rocks, Volcanic rocks, Terrigenous clastic rocks

• Thickness: 9,000 m or thicker
• Upper limit: Conformity, partly unconformity (Hayato Group)

------ 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.)
• Matsubara and Amano (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.134-150 DOI
• 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.)