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Seto Unit (Katsurada, 1956) Ueki et al., 2013

Invalid synonym: Seto Formation

• Type locality: Seto, Nanaho village, Otsuki city, Yamanashi prefecture
• Accretionary complex
• Deposition: middle Eocene - early Oligocene (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies: Mélange facies, Broken facies
• Lithofacies: Sandstone
• Exotic blocks (Crusts): Sandstone, Interbedded sandstone and shale, Tuffaceous shale
• Exotic blocks (Crusts, Minor): Basalt, Limestone, Chert

• Thickness: 2,500 m or thicker
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Seto, Otsuki city, Yamanashi pref.; Kushikawa river - Niroone - Mount Ogurayama - Shida pass, Sagamihara city, Kanagawa pref.; Mount Hachisuge - Mount Bukka - Mimase pass - Nakatsugawa river, Aikawa city, Aiko county, Kanagawa pref.; Mount Tobiosan, Atsugi city, Kanagawa pref.
• Fossils (Limestone): Stromatoporoids (Laterocavea sp.)
• Fossils (Radiolarians): Artophormis gracilis, Bathropyramis sp., Calocycletta? sp., Carpocanistrum sp., Dorcadospyris cf. ateuchus, Eucyrtidium? sp., Lithocyclia angusta, Lophocyrtis aspera, Lophocyrtis? cavifundus, Lychnocanoma? sp., Podocyrtis mirabilis, Podocyrtis mirabilis, Podocyrtis mitra, Theocorys bianulus, Theocyrtis careotuberosa, Theocyrtis perpumila, Theocyrtis tuberosa

• 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.)
• Saruta and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.1, pp.53-58 DOI
• Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)