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Hayato Group (Ishihara, 1964) Takahashi, 2008

Invalid synonym: Hayato Subgroup, Hayato Formation

• Coherent formation
• Trough-fill deposit at the collision boundary between Oceanic arc of Paleo-Izu-Bonin arc (Ocean crust) and Honshu arc (Island arc)
• Susugaya Trough deposit
• Late Miocene - early Pliocene (8.0 - 3.7 Ma)

• Sedimentary facies: Marine
• Metamorphic facies: Prehnite-Pumpellyite
• Lithofacies: Terrigenous clastic rocks, Mudstone, Sandstone, Conglomerate

• Thickness: 800 - 1,000 m
• Lower limit: Conformity, partly unconformity (Tanzawa Group)

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

• Distribution: Aonohara, Midori ward, Sagamihara city, Kanagawa pref.; Lake Miyagase - Susugaya, Kiyokawa city, Aiko county, 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.)